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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.
bq76920, bq76930, bq76940
SLUSBK2G OCTOBER 2013REVISED MAY 2016
bq769x0 3-Series to 15-Series Cell Battery Monitor Family
for Li-Ion and Phosphate Applications
1 Introduction
1.1 Features
1
1
AFE Monitoring Features
Pure Digital Interface
Internal ADC Measures Cell Voltage, Die
Temperature, and External Thermistor
A Separate, Internal ADC Measures Pack
Current (Coulomb Counter)
Directly Supports up to Three Thermistors
(103AT)
Hardware Protection Features
Overcurrent in Discharge (OCD)
Short Circuit in Discharge (SCD)
Overvoltage (OV)
Undervoltage (UV)
Secondary Protector Fault Detection
Additional Features
Integrated Cell Balancing FETs
Charge, Discharge Low-Side NCH FET Drivers
Alert Interrupt to Host Microcontroller
2.5-V or 3.3-V Output Voltage Regulator
No EEPROM Programming Necessary
High Supply Voltage Absolute Maximum (Up to
108 V)
Simple I2C™ Compatible Interface (CRC
Option)
Random Cell Connection Tolerant
1.2 Applications
Light Electric Vehicles (LEV): eBikes, eScooters,
Pedelec, and Pedal-Assist Bicycles
Power and Gardening Tools
Battery Backup and UPS Systems
Wireless Base Station Backup Systems
12-V, 18-V, 24-V, 36-V, and 48-V Battery Packs
1.3 Description
The bq769x0 family of robust analog front-end (AFE) devices serves as part of a complete packmonitoring
and protection solution for next-generation, high-power systems, such as light electric vehicles, power
tools, and uninterruptible power supplies. The bq769x0 is designed with low power in mind: Sub-blocks
within the IC may be enabled/disabled to control the overall chip current consumption, and a SHIP mode
provides a simple way to put the pack into an ultra-low power state.
Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
bq76920 TSSOP (20) 6.50 mm × 4.40 mm
bq76930 TSSOP (30) 7.80 mm × 4.40 mm
bq76940 TSSOP (44) 11.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
Rc
Rc
Rc
Rc
Rsns
Cc
Cc
Cc
Cc
Cc
100
0.1 µF
4. 7 µF
BAT
VC5
VC4
VC3
VC2
VC1
VSS
SCL
SDA
CHG
DSG
REGSRC
REGOUT
SRN
SRP
VC0
CAP1
TS1 Cf
100
0.1 µF
1 µF
Rc
Rf
1M1M
Rc
10k
ALERT
1M
PUSH- BUTTON FOR BOOT
VCC
GPIO
SDA
SCL
VSS
Cc
1 µF
0.1 µF
10 kΩ
PACK +
PACK–
Companion
Controller
Copyright © 2016, Texas Instruments Incorporated
2
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1.4 Simplified System Diagram
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Revision HistoryCopyright © 2013–2016, Texas Instruments Incorporated
Table of Contents
1 Introduction............................................... 1
1.1 Features .............................................. 1
1.2 Applications........................................... 1
1.3 Description............................................ 1
1.4 Simplified System Diagram........................... 2
2 Revision History ......................................... 3
3 Description (Continued)................................ 5
4 Device Comparison Table.............................. 5
5 Pin Configuration and Functions..................... 6
5.1 Versions .............................................. 6
5.2 bq76920 Pin Diagram ................................ 7
5.3 bq76930 Pin Diagram ................................ 8
5.4 bq76940 Pin Diagram ............................... 10
6 Specifications........................................... 12
6.1 Absolute Maximum Ratings......................... 12
6.2 ESD Ratings ........................................ 12
6.3 Recommended Operating Conditions............... 12
6.4 Thermal Information................................. 14
6.5 Electrical Characteristics............................ 14
6.6 Timing Requirements ............................... 19
6.7 Typical Characteristics.............................. 20
7 Detailed Description ................................... 21
7.1 Overview ............................................ 21
7.2 Functional Block Diagram........................... 21
7.3 Feature Description ................................. 22
7.4 Device Functional Modes ........................... 32
7.5 Register Maps....................................... 34
8 Application and Implementation .................... 46
8.1 Application Information.............................. 46
8.2 Typical Applications ................................. 47
9 Power Supply Recommendations .................. 53
10 Layout .................................................... 54
10.1 Layout Guidelines................................... 54
10.2 Layout Example..................................... 54
11 Device and Documentation Support ............... 57
11.1 Documentation Support ............................. 57
11.2 Related Links........................................ 57
11.3 Community Resources.............................. 57
11.4 Trademarks.......................................... 57
11.5 Electrostatic Discharge Caution..................... 57
11.6 Glossary............................................. 57
12 Mechanical, Packaging, and Orderable
Information .............................................. 57
2 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (November 2015) to Revision G Page
Changed Electrical Characteristics table to clarify the accuracy of the ADC in different temperature ranges.......... 15
Changes from Revision E (November 2014) to Revision F Page
Changed bq7693002 From: Product Preview To Production in the Device Comparison Table............................ 5
Added bq7693007 device to the Device Comparison Table.................................................................... 5
Changed table note to group ground reference in bq76930 Pin Functions................................................... 8
Changed table note to group ground reference in bq76940 Pin Functions ................................................. 10
Changed 10th cell to 11th cell in the Description of pin 29 ................................................................... 11
Changed table formats for online data sheet ................................................................................... 12
Changed Handing Ratings table to ESD Ratings............................................................................... 12
Changed note for R1 on Figure 7-3............................................................................................... 28
Added more description to the Communications Subsystem section ........................................................ 31
Changed "SHUTA" to "SHUT_A" and "SHUTB" to "SHUT_B" in the SHIP Mode section ................................ 33
Changed CAUTION verbiage (editorial).......................................................................................... 33
Changed the SHUT_A, SHUT_B bit descriptions in the SYS_CTRL1 (0x04) table........................................ 37
Changes from Revision D (July 2014) to Revision E Page
Added a note to the Absolute Maximum Ratings table ........................................................................ 12
Changed the Handling Ratings.................................................................................................... 12
Added the cross-reference to a new table note at VALERT_IH in Electrical Characteristics ................................. 18
Added a new table note ............................................................................................................ 18
Added the Typical Characteristics section ....................................................................................... 20
Changed the Alert section ......................................................................................................... 30
4
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Revision History Copyright © 2013–2016, Texas Instruments Incorporated
Changed verbiage in Communications Subsystem ............................................................................ 31
Deleted the READ/WRITE RSVD register in the Register Map............................................................... 34
Deleted the READ ONLY register information in the Register Map .......................................................... 34
Changed the reset for Bit 3 in the PROTECT3 register ....................................................................... 39
Changed wording in the ADCGAIN bit descriptions ........................................................................... 44
Added Application and Implementation note .................................................................................... 46
Added Design Requirements ...................................................................................................... 49
Added the Detailed Design Procedure ........................................................................................... 50
Changed the Layout Guidelines................................................................................................... 54
Changed the Layout Example .................................................................................................... 54
Added a Caution .................................................................................................................... 54
Changed the Good Layout figure ................................................................................................. 55
Changed the Weak Layout figure ................................................................................................ 56
Changes from Revision C (May 2014) to Revision D Page
Changed table reference in Integrated Hardware Protections ................................................................ 27
Changed paragraph 4 verbiage of Integrated Hardware Protections ........................................................ 27
Changes from Revision B (April 2014) to Revision C Page
Changed the documentation format ............................................................................................... 1
Changed some devices from Product Preview to Production Data............................................................ 5
Changed a bit name in the PROTECT1 register ............................................................................... 38
Changed a bit name in the ADCGAIN2 register ................................................................................ 45
Changes from Revision A (December 2013) to Revision B Page
Changed title of the data manual .................................................................................................. 1
Changed Ordering Information table to ........................................................................................... 5
Changed some devices to Product Preview ...................................................................................... 5
Changed Rfmax value in the Recommended Operating Conditions table ................................................. 13
Changed verbiage in mmunications Subsystem ............................................................................... 31
Changed SYS_STAT D6 bit name in the Register Map ....................................................................... 34
Changes from Original (October 2013) to Revision A Page
Changed some devices from Product Preview to Production Data............................................................ 5
Changed the tINDCELL test condition in Electrical Characteristics.............................................................. 15
Deleted duplicate CELLBAL3 table ............................................................................................... 36
Changed bq76940 with bq783xx Companion Controller IC Schematic...................................................... 49
5
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Device Comparison TableCopyright © 2013–2016, Texas Instruments Incorporated
(1) Product Preview only
3 Description (Continued)
The bq76920 device supports up to 5-series cells or typical 18-V packs, the bq76930 handles up to 10-
series cells or typical 36-V packs, and the bq76940 works for up to 15-series cells or typical 48-V packs. A
variety of battery chemistries may be managed with these AFEs, including Lithium Ion, Lithium iron
phosphate, and more.
Through I2C, a host controller can use the bq769x0 to implement many battery pack management
functions, such as monitoring (cell voltages, pack current, pack temperatures), protection (controlling
charge/discharge FETs), and balancing. Integrated A/D converters enable a purely digital readout of
critical system parameters, with calibration handled in TI’s manufacturing process.
4 Device Comparison Table
TUBE TAPE & REEL CELLS I2C ADDRESS (7-Bit) LDO (V) CRC PACKAGE
bq7692000PW bq7692000PWR
3–5 0x08
2.5 No
20-TSSOP (PW)
bq7692001PW(1) bq7692001PWR(1) Yes
bq7692002PW(1) bq7692002PWR(1)
3.3
No
bq7692003PW bq7692003PWR Yes
bq7692006PW bq7692006PWR 0x18 No
bq7693000DBT bq7693000DBTR
6–10
0x08
2.5 No
30-TSSOP (DBT)
bq7693001DBT bq7693001DBTR Yes
bq7693002DBT bq7693002DBTR
3.3
No
bq7693003DBT bq7693003DBTR Yes
bq7693006DBT bq7693006DBTR 0x18 No
bq7693007DBT bq7693007DBTR Yes
bq7694000DBT bq7694000DBTR
9–15 0x08
2.5 No
44-TSSOP (DBT)
bq7694001DBT bq7694001DBTR Yes
bq7694002DBT bq7694002DBTR
3.3
No
bq7694003DBT bq7694003DBTR Yes
bq7694006DBT bq7694006DBTR 0x18 No
Texas Instruments pre-configures the bq769x0 devices for a specific I2C address, LDO voltage, and more.
These settings are permanently stored in EEPROM and cannot be further modified.
Contact Texas Instruments for other options not listed above, as well as any options noted as “Product
Preview only.”
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
VC10
VC9
VC8
VC7
VC6
VC5
VC4
VC3
VC2
VC1
SRN
SRP
VC15
VC14
VC13
VC12
VC11
VC10 x
NC
NC
TS3
VC0
VC5x
VSS
SCL
SDA
NC
NC
CHG
DSG
CAP1
TS1
CAP3
CAP2
REGSRC
TS2
REGOUT
VC5B
20
21
22 NC
BAT
NC
NC
VC10 B
44
43
42
41
40
39
bq76940
44-TSSOP
ALERT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 16
17
18
19
30
29
28
27
26
25
24
23
22
21
20
VC10
VC9
VC8
VC7
VC6
VC5
VC4
VC3
VC2
VC1
VC0
VC5B
SRN
SRP
bq76930
30-TSSOP
ALERT
BAT
VC5x
VSS
SCL
SDA
NC
NC
CHG
DSG
CAP1
TS1
CAP2
REGSRC
TS2
REGOUT
SRN
SRP
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
VC5
VC4
VC3
VC2
VC1
VC0
NC
bq76920
20-TSSOP
ALERT
BAT
VSS
SCL
SDA
CHG
DSG
CAP 1
TS1
REGSRC
REGOUT
6
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Pin Configuration and Functions Copyright © 2013–2016, Texas Instruments Incorporated
5 Pin Configuration and Functions
5.1 Versions
Figure 5-1. Pin Versions
bq76920: 3–5 Series Cells (20-TSSOP)
6.5 mm x 4.4 mm x 1.2 mm
bq76930: 6–10 Series Cells (30-TSSOP)
7.8 mm x 4.4 mm x 1.2 mm
bq76940: 9–15 Series Cells (44-TSSOP)
11.3 mm x 4.4 mm x 1.2 mm
SRN
SRP
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
VC5
VC4
VC3
VC2
VC1
VC0
NC
bq76920
20-TSSOP
ALERT
BAT
VSS
SCL
SDA
CHG
DSG
CAP 1
TS1
REGSRC
REGOUT
7
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5.2 bq76920 Pin Diagram
5.2.1 bq76920 Pin Map
(1) If not used, pull down to VSS with a 10-kΩnominal resistor.
bq76920 Pin Functions
PIN NAME TYPE DESCRIPTION
1 DSG O Discharge FET driver
2 CHG O Charge FET driver
3 VSS Chip VSS
4 SDA I/O I2C communication to the host controller
5 SCL I I2C communication to the host controller
6 TS1 I Thermistor #1 positive terminal(1)
7 CAP1 O Capacitor to VSS
8 REGOUT P Output LDO
9 REGSRC I Input source for output LDO
10 BAT P Battery (top-most) terminal
11 NC No connect
12 VC5 I Sense voltage for 5th cell positive terminal
13 VC4 I Sense voltage for 4th cell positive terminal
14 VC3 I Sense voltage for 3rd cell positive terminal
15 VC2 I Sense voltage for 2nd cell positive terminal
16 VC1 I Sense voltage for 1st cell positive terminal
17 VC0 I Sense voltage for 1st cell negative terminal
18 SRP I Negative current sense (nearest VSS)
19 SRN I Positive current sense
20 ALERT I/O Alert output and override input
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 16
17
18
19
30
29
28
27
26
25
24
23
22
21
20
VC10
VC9
VC8
VC7
VC6
VC5
VC4
VC3
VC2
VC1
VC0
VC5B
SRN
SRP
bq76930
30-TSSOP
ALERT
BAT
VC5x
VSS
SCL
SDA
NC
NC
CHG
DSG
CAP1
TS1
CAP2
REGSRC
TS2
REGOUT
8
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5.3 bq76930 Pin Diagram
5.3.1 bq76930 Pin Map
(1) If not used, pull down to group ground reference (VSS for TS1 and VC5X for TS2) with a 10-kΩ
nominal resistor.
bq76930 Pin Functions
PIN NAME TYPE DESCRIPTION
1 DSG O Discharge FET driver
2 CHG O Charge FET driver
3 VSS Chip VSS
4 SDA I/O I2C communication to the host controller
5 SCL I I2C communication to the host controller
6 TS1 I Thermistor #1 positive terminal(1)
7 CAP1 O Capacitor to VSS
8 REGOUT P Output LDO
9 REGSRC I Input source for output LDO
10 VC5X P Thermistor #2 negative terminal
11 NC No connect (short to CAP2)
12 NC No connect (short to CAP2)
13 TS2 I Thermistor #2 positive terminal(1)
14 CAP2 O Capacitor to VC5X
15 BAT P Battery (top-most) terminal
16 VC10 I Sense voltage for 10th cell positive terminal
17 VC9 I Sense voltage for 9th cell positive terminal
18 VC8 I Sense voltage for 8th cell positive terminal
19 VC7 I Sense voltage for 7th cell positive terminal
20 VC6 I Sense voltage for 6th cell positive terminal
21 VC5B I Sense voltage for 6th cell negative terminal
22 VC5 I Sense voltage for 5th cell positive terminal
23 VC4 I Sense voltage for 4th cell positive terminal
9
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bq76930 Pin Functions (continued)
PIN NAME TYPE DESCRIPTION
24 VC3 I Sense voltage for 3rd cell positive terminal
25 VC2 I Sense voltage for 2nd cell positive terminal
26 VC1 I Sense voltage for 1st cell positive terminal
27 VC0 I Sense voltage for 1st cell negative terminal
28 SRP I Negative current sense (nearest VSS)
29 SRN I Positive current sense
30 ALERT I/O Alert output and override input
10
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5.4 bq76940 Pin Diagram
5.4.1 bq76940 Pin Map
(1) If not used, pull down to group ground reference (VSS for TS1, VC5X for TS2, and VC10X for TS3)
with a 10-kΩnominal resistor.
bq76940 Pin Functions
PIN NAME TYPE DESCRIPTION
1 DSG O Discharge FET driver
2 CHG O Charge FET driver
3 VSS Chip VSS
4 SDA I/O I2C communication to the host controller
5 SCL I I2C communication to the host controller
6 TS1 I Thermistor #1 positive terminal(1)
7 CAP1 O Capacitor to VSS
8 REGOUT P Output LDO
9 REGSRC I Input source for output LDO
10 VC5X P Thermistor #2 negative terminal
11 NC No connect (short to CAP2)
12 NC No connect (short to CAP2)
13 TS2 I Thermistor #2 positive terminal(1)
14 CAP2 O Capacitor to VC5X
15 VC10X P Thermistor #3 negative terminal
11
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bq76940 Pin Functions (continued)
PIN NAME TYPE DESCRIPTION
16 NC No connect (short to CAP3)
17 NC No connect (short to CAP3)
18 TS3 I Thermistor #3 positive terminal(1)
19 CAP3 O Capacitor to VC10X
20 BAT P Battery (top-most) terminal
21 NC No connect
22 NC No connect
23 NC No connect
24 VC15 I Sense voltage for 15th cell positive terminal
25 VC14 I Sense voltage for 14th cell positive terminal
26 VC13 I Sense voltage for 13th cell positive terminal
27 VC12 I Sense voltage for 12th cell positive terminal
28 VC11 I Sense voltage for 11th cell positive terminal
29 VC10B I Sense voltage for 11th cell negative terminal
30 VC10 I Sense voltage for 10th cell positive terminal
31 VC9 I Sense voltage for 9th cell positive terminal
32 VC8 I Sense voltage for 8th cell positive terminal
33 VC7 I Sense voltage for 7th cell positive terminal
34 VC6 I Sense voltage for 6th cell positive terminal
35 VC5B I Sense voltage for 6th cell negative terminal
36 VC5 I Sense voltage for 5th cell positive terminal
37 VC4 I Sense voltage for 4th cell positive terminal
38 VC3 I Sense voltage for 3rd cell positive terminal
39 VC2 I Sense voltage for 2nd cell positive terminal
40 VC1 I Sense voltage for 1st cell positive terminal
41 VC0 I Sense voltage for 1st cell negative terminal
42 SRP I Negative current sense (nearest VSS)
43 SRN I Positive current sense
44 ALERT I/O Alert output and override input
12
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Specifications Copyright © 2013–2016, Texas Instruments Incorporated
(1) The Absolute Maximum Ratings for (TS1–VSS) apply after the device completes POR and should be observed after tBOOTREADY
(10 ms), following the application of the boot signal on TS1. Prior to completion of POR, TS1 should not exceed 5 V.
6 Specifications
6.1 Absolute Maximum Ratings
Over-operating free-air temperature range (unless otherwise noted) MIN MAX UNIT
VBAT Supply voltage (BAT–VSS) bq76920 –0.3 36 V(BAT–VC5x), (VC5x–VSS) bq76930
(BAT–VC10x), (VC10x–VC5x), (VC5x–VSS) bq76940
VIInput voltage
(VCn–VSS) where n = 1..5 bq76920
–0.3 (n × 7.2) V
(VCn–VSS) where n = 1..5, (VCn-VC5x) where n =
6..10 bq76930
(VCn–VSS) where n = 1..5, (VCn–VC5x) where n =
6..10, (VCn–VC10x) where n = 11..15 bq76940
Cell input pins, differential (VCn–VCn–1) where n = 1..15/10/5
(bq76940/bq76930/bq76920, respectively) –0.3 9 V
SRN, SRP, SCL, SDA
–0.3 3.6 V
(VC0–VSS), (CAP1–VSS), (TS1–VSS)(1) bq76920
(VC0–VSS), (VC5b–VC5x), (CAP2–VC5x),
(CAP1–VSS), (TS2–VC5x), (TS1–VSS)(1) bq76930
(VC0–VSS), (VC5b–VC5x), (VC10b–VC10x),
(CAP3–VC10x), (CAP2–VC5x), (CAP1–VSS),
(TS3–VC10x), (TS2–VC5x), (TS1–VSS)(1) bq76940
REGSRC –0.3 36
VOOutput voltage REGOUT, ALERT –0.3 3.6 VDSG –0.3 20
CHG –0.3 VCHGCLAMP
ICB Cell balancing current (per cell) bq76920 70 mA
bq76930,
bq76940 5 mA
IDSG Discharge pin input current when disabled (measured into terminal) 7 mA
TSTG Storage temperature –65 150 °C
Lead temperature (soldering, 10 s) 300
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.2 ESD Ratings
VALUE UNIT
V(ESD) Electrostatic
discharge Human body model (HBM) ESD stress voltage(1) ±2 kV
Charged device model (CDM) ESD stress voltage(2) ±500 V
6.3 Recommended Operating Conditions
Over-operating free-air temperature range (unless otherwise noted). See Section 8.1.1 for more information on cell
configurations. All voltages are relative to VSS, except "Cell input differential." MIN TYP MAX UNIT
VBAT Supply voltage
(BAT–VSS) bq76920
6 25 V
(BAT–VC5x), (VC5x–VSS) bq76930
(BAT–VC10x), (VC10x–VC5x),
(VC5x–VSS) bq76940
13
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Recommended Operating Conditions (continued)
Over-operating free-air temperature range (unless otherwise noted). See Section 8.1.1 for more information on cell
configurations. All voltages are relative to VSS, except "Cell input differential." MIN TYP MAX UNIT
VIN Input voltage
Cell input pins, differential (VCn–VCn–1) where n =
1..15/10/5 (bq76940/bq76930/bq76920, respectively),
in-use cells only 2 5 V
(VCn–VSS) where n = 1..5 bq76920
0 5 × n V
(VCn–VSS) where n = 1..5,
(VCn–VC5x) where n = 6..10 bq76930
(VCn–VSS) where n = 1..5,
(VCn–VC5x) where n = 6..10,
(VCn–VC10x) where n = 11..15 bq76940
SRP
–10 10 mV
(VC0–VSS) bq76920
(VC0–VSS), (VC5b–VC5x) bq76930
(VC0–VSS), (VC5b–VC5x),
(VC10b–VC10x) bq76940
SRN –200 200 mV
SCL, SDA
0 3.6 V
(TS1–VSS) bq76920
(TS1–VSS), (TS2–VC5x) bq76930
(TS1–VSS), (TS2–VC5x),
(TS3–VC10x) bq76940
REGSRC 6 25
VOUT Output voltage
CHG, DSG 0 16 V
REGOUT, ALERT
0 3.6 V
(CAP1–VSS) bq76920
(CAP1–VSS), (CAP2–VC5x) bq76930
(CAP1–VSS), (CAP2–VC5x),
(CAP3–VC10x) bq76940
ICB Cell balancing
current (internal, per
cell)
bq76920 0 50 mA
bq76930, bq76940 0 5 mA
RCExternal cell input
resistance bq76920 40 100 1K Ω
bq76930, bq76940 500 1K 1K Ω
CCExternal cell input capacitance 0.1 1 10 µF
RfExternal supply filter resistance 40 100 1K Ω
CfExternal supply filter capacitance 1 10 40 µF
RFILT Sense resistor filter resistance 100 1K Ω
RALERT ALERT pin to VSS resistor 1M Ω
CLREGOUT loading capacitance 1 4.7 µF
CCAP REGSRC, CAP1, CAP2, and CAP3 output capacitance 1 µF
RTS External thermistor nominal resistance (103AT) at 25ºC 10K Ω
TOPR Operating free-air temperature –40 85 °C
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(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report (SPRA953).
(2) The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as
specified in JESD51-7, in an environment described in JESD51-2a.
(3) The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific JEDEC-
standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
(4) The junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the PCB
temperature, as described in JESD51-8.
(5) The junction-to-top characterization parameter, ψJT, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining RθJA, using a procedure described in JESD51-2a (sections 6 and 7).
(6) The junction-to-board characterization parameter, ψJB, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining RθJA, using a procedure described in JESD51-2a (sections 6 and 7).
(7) The junction-to-case (bottom) thermal resistance is obtained by simulating a cold plate test on the exposed (power) pad. No specific
JEDEC standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
Spacer
6.4 Thermal Information
Over-operating free-air temperature range (unless otherwise noted)
THERMAL METRIC(1) TSSOP UNIT
bq76920xy
20 PINS (PW) bq76930xy
30 PINS (DBT) bq76940xy
44 PINS (DBT)
RθJA, High K Junction-to-ambient thermal resistance(2) 93.7 86.5 70.1 °C/W
RθJC(top) Junction-to-case(top) thermal resistance(3) 28.7 19.4 17.5 °C/W
RθJB Junction-to-board thermal resistance(4) 44.6 41.3 33.9 °C/W
ψJT Junction-to-top characterization parameter(5) 1.3 0.5 0.5 °C/W
ψJB Junction-to-board characterization parameter(6) 44.1 40.6 33.4 °C/W
RθJC(bottom) Junction-to-case(bottom) thermal resistance(7) n/a n/a n/a °C/W
6.5 Electrical Characteristics
Typical conditions are measured at 25ºC with nominal BAT voltages of 18 V (bq76920), 36 V (bq76930), or 48 V (bq76940)
with VCELL = 4 V. Min and max values include full recommended operating condition temperature range from –40ºC to +85ºC.
Certain characteristics may be shown at different voltage or temperature ranges, as clarified in the Test Condition sections.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
SUPPLY CURRENTS
IDD
NORMAL mode: ADC off,
CC off
Sum of ICC_BAT and ICC_REGSRC
currents
40 60
µA
NORMAL mode: ADC on,
CC off 60 90
NORMAL mode: ADC off,
CC on 110 165
NORMAL mode: ADC on,
CC on 130 195
ICC_BAT NORMAL mode: ADC off Into BAT pin 30 45
NORMAL mode: ADC on 50 75
ICC_REGSRC NORMAL mode: CC off Into REGSRC pin 10 15
NORMAL mode: CC on 80 120
ISHIP SHIP/SHUTDOWN mode Device in full shutdown, only
VSTUP/BG and BOOT detector on 0.6 1.8
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Electrical Characteristics (continued)
Typical conditions are measured at 25ºC with nominal BAT voltages of 18 V (bq76920), 36 V (bq76930), or 48 V (bq76940)
with VCELL = 4 V. Min and max values include full recommended operating condition temperature range from –40ºC to +85ºC.
Certain characteristics may be shown at different voltage or temperature ranges, as clarified in the Test Condition sections.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
(1) Measured at BAT pin, rising.
LEAKAGE AND OFFSET CURRENTS
dINOM NORMAL mode supply
current offset Measured into VC5x (bq76930,
bq76940) and VC10x (bq76940)
–5 ±2.5 5
µA
dISHIP SHIP mode supply
current offset –1.0 ±0.1 1.0
dIALERT Supply current when
ALERT active Measured into VC5x (bq76930,
bq76940) or added to BAT (bq76920) 15 25
dICELL Cell measurement input
current
Measured into VC0–VC15 except VC5,
VC10, VC15 –0.3 ±0.1 0.3
Measured into VC5, VC10, VC15 0.5
ILKG Terminal input leakage 1
INTERNAL POWER CONTROL (STARTUP and SHUTDOWN)
VPORA Analog POR threshold See Note(1) 4 5 V
VSHUT Shutdown voltage See Note(1) 3.6 V
tI2CSTARTUP Time delay after boot
signal on TS1 before I2C
communications allowed Delay after boot sequence when I2C
communication is allowed 1 ms
tBOOTREADY Device boot startup delay Delay after boot signal when device has
completed full boot-up sequence 10 ms
TSHUTD Thermal shutdown
voltage 100 150 °C
MEASUREMENT SCHEDULE
tVCELL Cell voltage measurement
interval bq76920, bq76930, bq76940 250
ms
tINDCELL Individual cell
measurement time Per cell, balancing off 50
Per cell, balancing on 12.5
tCB_RELAX Cell balancing relaxation
time before cell voltage
measured 12.5
tTEMP_DEC Temperature
measurement decimation
time Measurement duration for temperature
reading 12.5
tBAT Pack voltage calculation
interval 250
tTEMP Temperature
measurement interval Period of measurement of either
TS1/TS2/TS3 or internal die temp 2 s
14-BIT ADC FOR CELL VOLTAGE AND TEMPERATURE MEASUREMENT
ADCRANGE ADC measurement
recommend operation
range
VCELL measurements 2 5 V
TS/Temp measurements 0.3 3 V
ADCLSB ADC LSB value 382 µV
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Electrical Characteristics (continued)
Typical conditions are measured at 25ºC with nominal BAT voltages of 18 V (bq76920), 36 V (bq76930), or 48 V (bq76940)
with VCELL = 4 V. Min and max values include full recommended operating condition temperature range from –40ºC to +85ºC.
Certain characteristics may be shown at different voltage or temperature ranges, as clarified in the Test Condition sections.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
ADC
ADC cell voltage
accuracy at 25°C
VCELL = 3.6 4.3 V ±10
mV
VCELL = 3.2 4.6 V ±15
VCELL = 2.0 5.0 V ±25
ADC cell voltage
accuracy 0°C to 60°C
VCELL = 3.6 4.3 V ±20
VCELL = 3.2 4.6 V ±25
VCELL = 2.0 5.0 V ±35
ADC cell voltage
accuracy –40°C to 85°C
VCELL = 3.6 4.3 V –40 40
VCELL = 3.2 4.6 V –40 40
VCELL = 2.0 5.0 V –50 50
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Electrical Characteristics (continued)
Typical conditions are measured at 25ºC with nominal BAT voltages of 18 V (bq76920), 36 V (bq76930), or 48 V (bq76940)
with VCELL = 4 V. Min and max values include full recommended operating condition temperature range from –40ºC to +85ºC.
Certain characteristics may be shown at different voltage or temperature ranges, as clarified in the Test Condition sections.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
(2) Values indicate nominal thresholds only. For Min and Max variation, apply OCOFFSET and OCSCALERR.
(3) Values indicate nominal thresholds only. For Min and Max variation, apply tPROTACC.
16-BIT CC FOR PACK CURRENT MEASUREMENT
CCRANGE CC input voltage range –200 200 mV
CCFSR CC full scale range –270 270 mV
CCLSB CC LSB value CC running constantly 8.44 µV
tCCREAD Conversion time Single conversion 250 ms
CCINL Integral nonlinearity 16-bit, best fit over input voltage range
± 200 mV ± 2 ± 40 LSB
CCOFFSET Offset error ± 1 ± 3 LSB
CCGAIN Gain error Over input voltage range ± 0.5% ± 1.5% FSR
CCGAINDRIFT Gain error drift Over input voltage range 150 PPM / °C
CCRIN Effective input resistance 2.5 MΩ
THERMISTOR BIAS
RTS Pull-up resistance TA= 25°C 9.85 10 10.15 kΩ
RTSDRIFT Pull-up resistance across
temp TA= –40°C to 85°C 9.7 10.3 kΩ
DIETEMP
VDIETEMP25 Die temperature voltage TA= 25°C 1.20 V
VDIETEMPDRIFT Die temperature voltage
drift –4.2 mV/°C
INTEGRATED HARDWARE PROTECTIONS
OVRANGE OV threshold range 0x2008 0x2FF8 ADC
UVRANGE UV threshold range 0x1000 0x1FF0 ADC
OVUVSTEP OV and UV threshold step
size 16 LSB
UVMINQUAL UV minimum value to
qualify Below UVMINQUAL, cell is shorted
(unused) 0x0518 ADC
OVDELAY OV delay timer options
OV delay = 1 s 0.7 1 1.75
s
OV delay = 2 s 1.6 2 2.75
OV delay = 4 s 3.5 4 5
OV delay = 8 s 7 8 10
UVDELAY UV delay timer options
UV delay = 1 s 0.7 1 1.75
UV delay = 4 s 3.5 4 5
UV delay = 8 s 7 8 10
UV delay = 16 s 14 16 20
OCDRANGE OCD threshold options Measured across (SRP–SRN)(2) 8 100 mV
OCDSTEP OCD threshold step size RSNS = 0 2.78 mV
RSNS = 1 5.56 mV
OCDDELAY OCD delay options See Note (3) 8 1280 ms
SCDRANGE SCD threshold options Measured across (SRP–SRN)(2) 22 200 mV
SCDSTEP SCD threshold step size RSNS = 0 11.1 mV
RSNS = 1 22.2 mV
SCDDELAY SCD delay options
35 70 105 µs
50 100 150 µs
140 200 260 µs
280 400 520 µs
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Electrical Characteristics (continued)
Typical conditions are measured at 25ºC with nominal BAT voltages of 18 V (bq76920), 36 V (bq76930), or 48 V (bq76940)
with VCELL = 4 V. Min and max values include full recommended operating condition temperature range from –40ºC to +85ºC.
Certain characteristics may be shown at different voltage or temperature ranges, as clarified in the Test Condition sections.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
(4) MIN specifies the threshold below which the device will never register that an external alert has occurred. MAX specifies the minimum
threshold above which the device will always register that an external alert has occurred.
tPROTACC Delay accuracy for OCD –20% 20%
OCOFFSET OCD and SCD voltage
offset –2.5 2.5 mV
OCSCALEERR OCD and SCD scale
accuracy –10% 10%
CHARGE AND DISCHARGE DRIVERS
VFETON CHG and DSG on
REGSRC 12 V with load resistance of
10 MΩ10 12 14 V
REGSRC < 12 V with load resistance of
10 MΩREGSRC
–2 REGSRC
–1 REGSRC V
tFET_ON CHG and DSG ON rise
time CHG/DSG driving an equivalent load
capacitance of 10 nF, measured from
10% to 90% of VFETON 200 250 µs
tDSG_OFF DSG pull-down OFF fall
time DSG driving an equivalent load
capacitance of 10 nF, measured from
90% to 10% 60 90 µs
RCHG_OFF CHG pull-down OFF
resistance to VSS When CHG disabled, CHG held at 12 V 750 1000 1250 kΩ
RDSG_OFF DSG pull-down OFF
resistance to VSS When DSG disabled, DSG held at 12 V 1.75 2.50 4.25 kΩ
VLOAD_DETECT Load detection threshold 0.4 0.7 1.0 V
VCHG_CLAMP CHG clamp voltage If the CHG pin externally pulled high
(through PACK–, if load applied),
500 µA max sink current into CHG pin.
With CHG_ON bit cleared. 18 20 22 V
ALERT PIN
VALERT_OH ALERT output voltage
high IOL = 1 mA REGOUT x
0.75 V
VALERT_OL ALERT output voltage low Unloaded REGOUT
x 0.25 V
VALERT_IH ALERT input high ALERT externally forced high when
internally driven low. See note (4).1 1.5 V
RALERT_PD ALERT pin weak
pulldown resistance when
driven low Measured into ALERT pin with ALERT
= REGOUT 0.8 2.5 8 MΩ
CELL BALANCING DRIVER
RDSFET Internal cell balancing
driver resistance VCELL = 3.6 V 1 5 10 Ω
XBAL Cell balancing duty cycle
when enabled Every 250 ms 70%
EXTERNAL REGULATOR
VEXTLDO External LDO voltage
options Nominal values, TI factory programmed,
unloaded, across temp 2.45 2.50 2.55 V
3.20 3.30 3.40 V
VEXTLDO_LN Line regulation REGSRC pin stepped from 6 to 25 V,
with 10 mA load, in 100 µs 100 mV
VEXTLDO_LD Load regulation IREGOUT = 0 mA to 10 mA –4% 4%
VEXTLDO_DC External LDO minimum
voltage under DC load
REGOUT = 10 mA DC, 2.5-V version 2.4 V
REGOUT = 20 mA DC, 2.5-V version 2.3 V
REGOUT = 10 mA DC, 3.3-V version 3.15 V
REGOUT = 20 mA DC, 3.3-V version 3.05 V
SCL
SDA
SDA
SCL
SDA
SCL
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Electrical Characteristics (continued)
Typical conditions are measured at 25ºC with nominal BAT voltages of 18 V (bq76920), 36 V (bq76930), or 48 V (bq76940)
with VCELL = 4 V. Min and max values include full recommended operating condition temperature range from –40ºC to +85ºC.
Certain characteristics may be shown at different voltage or temperature ranges, as clarified in the Test Condition sections.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
IEXTLDO_LIMIT External LDO current limit REGOUT = 0 V 30 38 45 mA
BOOT DETECTOR
VBOOT Boot threshold voltage Measured at TS1 pin with device in
SHIP mode. Below MIN, device will not
boot up. Above MAX, device will be
guaranteed to boot up. 300 1000 mV
tBOOT_max Boot threshold application
time Measured at TS1 pin. Below MIN,
device will not boot up. Above MAX,
device will be guaranteed to boot up. 10 2000 µs
6.6 Timing Requirements
I2C COMPATIBLE INTERFACE MIN TYP MAX UNIT
VIL Input Low Logic Threshold REGOUT x
0.25 V
VIH Input High Logic Threshold REGOUT x
0.75 V
VOL Output Low Logic Drive 0.20 V
tfSCL, SDA Fall Time 0.40
VOH Output High Logic Drive (Not applicable due to open-drain outputs) N/A N/A V
tHIGH SCL Pulse Width High 4.0 µs
tLOW SCL Pulse Width Low 4.7 µs
tSU;STA Setup time for START condition 4.7 µs
tHD;STA START condition hold time after which first clock pulse is generated 4.0 µs
tSU;DAT Data setup time 250 ns
tHD;DAT Data hold time 0 µs
tSU;STO Setup time for STOP condition 4.0 µs
tBUF Time the bus must be free before new transmission can start 4.7 µs
tVD;DAT Clock Low to Data Out Valid 900 ns
tHD;DAT Data Out Hold Time After Clock Low 0 ns
fSCL Clock Frequency 0 100 kHz
Figure 6-1. I2C Timing
±0.02
±0.02
±0.01
±0.01
0.00
0.01
0.01
±40 ±15 10 35 60 85
OV Detection Error (V)
Temperature (ƒC)
C004
±0.7
±0.6
±0.5
±0.4
±0.3
±0.2
±0.1
0.0
±40 ±15 10 35 60 85
Gain Error (%FSR)
Temperature (ƒC)
C003
±1.6
±1.4
±1.2
±1.0
±0.8
±0.6
±0.4
±0.2
0.0
±40 ±15 10 35 60 85
Offset (uV)
Temperature (ƒC)
C002
±5
0
5
10
15
20
25
30
±40 ±15 10 35 60 85
Gain Error (PPM)
Temperature (ƒC)
C005
±0.004
±0.002
0.000
0.002
0.004
0.006
0.008
0.010
0.012
0.014
0.016
0.018
0.020
2.00 2.30 2.60 2.90 3.20 3.50 3.80 4.10 4.40 4.70 5.00
VCx Error (mV)
VCx Input (V)
VC1 Error
VC2 Error
VC3 Error
VC4 Error
VC5 Error
C001
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6.7 Typical Characteristics
Figure 6-2. bq76930 VCx Error Across Input Range at 25°C with
VIN at 3.6 V Figure 6-3. Coulomb Counter Gain Error Temperature Drift
(from –0.2 V to 0.2 V)
Figure 6-4. Coulomb Counter Gain Error
(from –0.2 V to 0.2 V) Figure 6-5. Coulomb Counter Offset
Figure 6-6. OV Protection Detection Error (0xFF Setting)
BAT
CHG
VSS
Cell Balance
Drivers/FETs
EEPROM
Internal 3.3-V
LDO
DSG
SRNSRP
SDA
SCL
TS
REG
SRC
REG
OUT
External
2.5/3.3-V LDO
I2C
Bandgap
IBIAS
VSTUP/POR
14-bit ADC
Modulator
V2I
OCD
comp
Digital core
BOOT
CAP
To POR
BOOT
256 kHz
ALERT
FET
DRIVER and
LOAD
DETECT
CC VREF
16-bit ACC
Modulator
TS
Die temp
VCx Inputs
SCD
comp
Copyright © 2016, Texas Instruments Incorporated
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Detailed DescriptionCopyright © 2013–2016, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
In the bq769x0 family of analog front-end (AFE) devices, the bq76920 device supports up to 5-series cells,
the bq76930 device supports up to 10-series cells, and the bq76940 device supports up to 15-series cells.
Through I2C, a host controller can use the bq769x0 to implement battery pack management functions,
such as monitoring (cell voltages, pack current, pack temperatures), protection (controlling
charge/discharge FETs), and balancing. Integrated A/D converters enable a purely digital readout of
critical system parameters including cell voltages and internal or external temperature, with calibration
handled in TI’s manufacturing process. For an additional degree of pack reliability, the bq769x0 includes
hardware protections for voltage (OV, UV) and current (OCD, SCD).
The bq769x0 provides two low-side FET drivers, charge (CHG) and discharge (DSG), which may be used
to directly manipulate low-side power NCH FETs, or as signals that control an external circuit that enables
high-side PCH or NCH FETs. A dedicated ALERT input/output pin serves as an interrupt signal to the host
microcontroller, quickly informing the microcontroller of an updated status in the AFE. This may include a
fault event or that a coulomb counter sample is available for reading. An available ALERT pin may also be
driven externally by a secondary protector to provide a redundant means of disabling the CHG and DSG
signals and higher system visibility.
7.2 Functional Block Diagram
Figure 7-1. Functional Block Diagram
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7.3 Feature Description
7.3.1 Subsystems
bq769x0 consists of three major subsystems: Measurement, Protection, and Control. These work together
to ensure that the fundamental battery pack parameters—voltage, current and temperature—are
accurately captured and easily available to a host controller, while ensuring a baseline or secondary level
of hardware protection in the event that a host controller is unable or unavailable to manage certain fault
conditions.
NOTE
The bq769x0 is intended to serve as an analog front-end (AFE) as part of a chipset system
solution: A companion microcontroller is required to oversee and control this AFE.
The Measurement subsystem’s core responsibility is to digitize the cell voltages, pack current
(integrated into a passed charge calculation), external thermistor temperature, and internal die
temperature. It also performs an automatic calculation of the total battery stack voltage, by simply
adding up all measured cell voltages.
The Protection subsystem provides a baseline or secondary level of hardware protections to better
support a battery pack’s FMEA requirements in the event of a loss of host control or simply if a host is
unable to respond to a certain fault event in time. Integrated protections include pack-level faults such
as OV, UV, OCD, SCD, detection of an external secondary protector fault, and internal logic
“watchdog”-style device fault (XREADY). Protection events will trigger toggling of the ALERT pin, as
well as automatic disabling of the DSG or CHG FET driver (depending on the fault). Recovery from a
fault event must be handled by the host microcontroller.
The Control subsystem implements a suite of useful pack features, including direct low-side NCH FET
drivers, cell balancing drivers, the ALERT digital output, an external LDO and more.
The following sections describe each subsystem in greater detail, as well as explaining the various power
states that are available.
7.3.1.1 Measurement Subsystem Overview
The monitoring subsystem ensures that all cell voltages, temperatures, and pack current may be easily
measured by the host. All ADCs are trimmed by TI.
ADC and CC data are always returned as atomic values if both high and low registers are read in the
same transaction (using address auto-increment).
7.3.1.1.1 Data Transfer to the Host Controller
The bq769x0 has a fully digital interface: All information is transferred through I2C, simply by reading
and/or writing to the appropriate register(s) storing the relevant data. Block reads and writes, buffered by
an 8-bit CRC code per byte, ensure a fast and robust transmission of data.
7.3.1.1.2 14-Bit ADC
Each bq769x0 device measures cell voltages and temperatures using a 14-bit ADC. This ADC measures
all differential cell voltages, thermistors and/or die temperature with a nominal full-scale unsigned range of
0–6.275 V and LSB of 382 µV.
To enable the ADC, the [ADC_EN] bit in the SYS_CTRL1 register must be set. This bit is set automatically
whenever the device enters NORMAL mode. When enabled, the ADC ensures that the integrated OV and
UV protections are functional.
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For each contiguous set of five cells (VC1 to VC5, VC6 to VC10), when no cells in that particular set are
being balanced, each cell is measured over a 50-ms decimation window and a complete update is
available every 250 ms. In the bq76930 and bq76940, every set of five cells above the primary five cells is
measured in parallel. The 50-ms decimation greatly assists with removing the aliasing effects present in a
noisy motor environment.
When any cells in a contiguous set of 5 cells are being balanced, those affected cells are measured in a
reduced 12.5-ms decimation period, to allow the cell balancing to function properly without affecting the
integrated OV and UV protections. Since cell balancing is typically only performed during pack charge or
idle periods, the shortened decimation periods should not impact accuracy as the system noise during
these times is greatly reduced. This reduced decimation period is only applied to sets where one of the
cells is being balanced. The following summarizes this for the bq76920–bq76940 devices:
VC1 to VC5 measurements are each taken in a 50-ms decimation period when all bits in CELLBAL1
register are 0, and a 12.5-ms decimation period when any bits in CELLBAL1 register are 1.
VC6 to VC10 measurements are each taken in a 50-ms decimation period when all bits in CELLBAL2
register are 0, and a 12.5-ms decimation period when any bits in CELLBAL2 register are 1.
VC11 to VC15 measurements are each taken in a 50-ms decimation period when all bits in CELLBAL3
register are 0, and a 12.5-ms decimation period when any bits in CELLBAL3 register are 1.
Total update interval is 250 ms.
Each differential cell input is factory-trimmed for gain or offset, such that the resulting reading through I2C
is always consistent from part-to-part and requires no additional calibration or correction factor application.
The ADC is required to be enabled in order for the integrated OV and UV protections to be operating.
The following shows how to convert the 14-bit ADC reading into an analog voltage. Each device is factory
calibrated, with a GAIN and OFFSET stored into EEPROM.
The ADC transfer function is a linear equation defined as follows:
V(cell) = GAIN x ADC(cell) + OFFSET (1)
GAIN is stored in units of µV/LSB, while OFFSET is stored in mV units.
Some example cell voltage calculations are provided in the table below. For illustration purposes, the
example uses a hypothetical GAIN of 380 µV/LSB (ADCGAIN<4:0> = 0x0F) and OFFSET of 30 mV
(ADCOFFSET<7:0> = 0x1E).
14-Bit ADC Result ADC Result in Decimal GAIN (µV/LSB) OFFSET (mV) Cell Voltage (mV)
0x1800 6144 380 30 2365
0x1F10 7952 380 30 3052
NOTE
When entering NORMAL mode from SHIP mode, please allow for the following times before
reading out initial cell voltage data:
bq76920: 250 ms
bq76930: 400 ms
bq76940: 800 ms
Battery cell stack
Gen.purpose output
A/D input
Host microcontroller
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7.3.1.1.2.1 Optional Real-time Calibration Using the Host Microcontroller
The performance of the cell voltage values measured by the 14-bit ADC has a factory-calibrated accuracy,
as follows:
+/– 10 mV TYP, +/– 40 mV MIN and MAX from 3.6 to 4.3 V,
+/– 15 mV TYP, +/– 40 mV MIN and MAX from 3.2 to 4.6 V, and
+/– 50 mV MIN and MAX from 2.0 to 5.0 V
While this is suitable for the majority of pack protection and basic monitoring applications the bq769x0
AFE family is intended to support, certain systems may require a higher accuracy performance.
To achieve this, use an available ADC channel and general purpose output terminal on the host
microcontroller paired with the bq769x0. A simple external circuit consisting of two precision resistors and
a small-signal FET is activated by the host microcontroller to determine the total stack voltage, VSTACK.
This is then compared against the sum of the individual cell voltages as measured by the internal ADC of
the bq769x0. The resulting transfer function coefficient, GAIN2, is simply applied to each cell voltage ADC
value for improved accuracy.
Figure 7-2. External Real-Time Calibration Circuit to Host Microcontroller
The process is as follows:
1. Periodically measure VSTACK.
(a) VSTACK = VAD × (R1 + R2) / R1
2. Read out all VCELL ADC readings from the bq769x0 and apply the standard GAIN and OFFSET values
stored in the bq769x0.
(a) V(1) = GAIN x ADC1+ OFFSET, V(2) = GAIN x ADC2+ OFFSET, and so on
3. Sum up all VCELL values, VSUM.
(a) VSUM = V(1) + V(2) + V(3)
4. Calculate GAIN2.
(a) GAIN2= VSTACK / VSUM
As a general recommendation, a new GAIN2function should be generated when the cell voltages increase
or decrease by more than 100 mV. With GAIN2, each cell voltage calculation becomes:
V(cell) = GAIN2× (GAIN x ADC(cell) + OFFSET) (2)
For systems that do not require this additional in-use calibration function, GAIN2is simply “1”.
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7.3.1.1.3 16-Bit CC
A 16-bit integrating ADC, commonly referred to as the coulomb counter (CC), provides measurements of
accumulated charge across the current sense resistor. The integration period for this reading is 250 ms.
The CC may be operated in one of two modes: ALWAYS ON and 1-SHOT.
In ALWAYS ON mode, the CC runs at 100%, gathering a fresh reading every 250 ms. The conclusion
of each reading sets the CC_READY bit, which toggles the ALERT pin high to inform the
microcontroller that a new reading is available. To enable Always On mode, set [CC_EN] = 1.
In 1-SHOT mode, the CC performs a single 250-ms reading, and similarly sets the CC_READY bit
when completed. This mode is intended for non-gauging usages, where the host simply desires to
check the pack current.
To enable a 1-SHOT reading, ensure [CC_EN] = 0 and set [CC_ONESHOT] = 1.
The full scale range of the CC is ± 270 mV, with a max recommended input range of ± 200 mV, thus
yielding an LSB of approximately 8.44 µV.
The following equation shows how to convert the 16-bit CC reading into an analog voltage if no board-
level calibration is performed:
CC Reading (in µV) = [16-bit 2’s Complement Value] × (8.44 µV/LSB) (3)
16-Bit CC Result ADC Result in Decimal CC Reading (in µV)
0x0001 1 8.44
0x2710 10000 84,400
0x7D00 32000 270,080
0x8300 –32000 –270,080
0xC350 –15536 –131,123.84
0xFFFF –1 –8.44
7.3.1.1.4 External Thermistor
One (bq76920), two (bq76930), or three (bq76940) 10-kΩNTC 103AT thermistors may be measured by
the device. These are measured by applying a factory-trimmed internal 10-k pull-up resistance to an
internal regulator value of nominally 3.3 V, the result of which can be read out from the TSx (TS1, TS2,
TS3) registers.
To select thermistor measurement mode, set [TEMP_SEL] = 1.
Thermistor TS1 is connected between TS1 and VSS; TS2 is connected between TS2 and VC5x (bq76930
and bq76940 only); and TS3 is connected between TS3 and VC10x (bq76940 only). These thermistors
may be placed in various areas in the battery pack to measure such things as localized cell temperature,
FET heating, and so forth.
The thermistor impedance may be calculated using the 14-bit ADC reading in the TS1, TS2, and TS3
registers and 10-k internal pull-up resistance as follows:
The following equations show how to use the 14-bit ADC readings in TS1, TS2, and TS3 to determine the
resistance of the external 103AT thermistor:
VTSX = (ADC in Decimal) x 382 µV/LSB (4)
RTS = (10,000 × VTSX) ÷ (3.3 VTSX) (5)
To convert the thermistor resistance into temperature, please refer to the thermistor component
manufacturer’s datasheet.
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7.3.1.1.5 Die Temperature Monitor
NOTE
When switching between external and internal temperature monitoring, a 2-s latency may be
incurred due to the natural scheduler update interval.
A die temperature block generates a voltage that is proportional to the die temperature, and provides a
way of reducing component count if pack thermistors are not used or ensuring that the die power
dissipation requirements are observed. The die is measured using the same on-board 14-bit ADC as the
cell voltages.
To select internal die temperature measurement mode, set [TEMP_SEL] = 0.
For bq76930 and bq76940, multiple die temperature measurements are available. These are stored in
TS2 and TS3.
To convert a DIETEMP reading into temperature, refer to the following equation box. If more accurate
temperature readings are needed from DIETEMP, the DIETEMP at room temperature value should be
stored during production calibration.
The following equation shows how to use the 14-bit ADC readings in TS1, TS2, and TS3 when
[TEMPSEL] = 0 to determine the internal die temperature:
V25 = 1.200 V (nominal) (6)
VTSX = (ADC in Decimal) x 382 µV/LSB (7)
TEMPDIE = 25° ((VTSX V25) ÷ 0.0042) (8)
7.3.1.1.6 16-Bit Pack Voltage
Once converted to digital form, each cell voltage is added up and the summation result stored in the BAT
registers. This 16-bit value has a nominal LSB of 1.532 mV.
The following shows how to convert the 16-bit pack voltage ADC reading into an analog voltage. This
value also uses the GAIN and OFFSET stored into EEPROM.
The ADC transfer function is a linear equation defined as follows:
V(BAT) = 4 x GAIN x ADC(cell) + (#Cells x OFFSET) (9)
GAIN is stored in units of µV/LSB, while OFFSET is stored in mV units.
7.3.1.1.7 System Scheduler
A master scheduler oversees the monitoring intervals, creating a full update every 250 ms. Temperature
measurements are taken every 2 seconds. Pack voltage is calculated every 250 ms.
7.3.1.2 Protection Subsystem
7.3.1.2.1 Integrated Hardware Protections
Integrated hardware protections are provided as an extra degree of safety and are meant to supplement
the standard protection feature set that would be incorporated into the host controller firmware. They
should not be used as the sole means of protecting a battery pack, but are useful for FMEA purposes; for
example, in the event that a host microcontroller is unable to react to any of the below protection
situations. All hardware protection thresholds and delays should be loaded into the AFE by the host
microcontroller during system startup. The AFE will also default to pre-defined threshold and delay
settings, in case the host microcontroller is unable to or does not wish to program the protection settings.
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Overcurrent in Discharge (OCD) and Short Circuit in Discharge (SCD) are implemented using sampled
analog comparators that run at 32 kHz, and that continuously monitor the voltage across (SRP–SRN)
while the device is in NORMAL mode. Upon detection of a voltage that exceeds the programmed OCD or
SCD threshold, a counter begins to count up to a programmed delay setting. If the counter reaches its
target value, the SYS_STAT register is updated to indicate the fault condition, the FET state(s) are
updated as shown in
Table 7-1, and the ALERT pin is driven high to interrupt the host.
The protection fault threshold and delay settings for OCD and SCD protections are configured through the
PROTECT1 and PROTECT2 registers. See Section 7.5 for details about supported values.
Overvoltage (OV) and Undervoltage (UV) protections are handled digitally, by comparing the cell voltage
readings against the 8-bit programmed thresholds in the OV and UV registers.
The OV threshold is stored in the OV_TRIP register and is a direct mapping of 8 bits of the 14-bit ADC
reading, with the upper 2 MSB preset to “10” and lower 4 LSB preset to “1000”. In other words, the
corresponding OV trip level is mapped to “10-XXXX-XXXX–1000”. The programmable range of OV
thresholds is approximately 3.15 to 4.7 V, but this is subject to variation due to
the (GAIN, OFFSET) linear equation used to map the ADC values.
The UV threshold is stored in the UV_TRIP register and is a direct mapping of 8 bits of the 14-bit ADC
reading, with the upper 2 MSB preset to “01” and lower 4 LSB preset to “0000”. In other words, the
corresponding OV trip level is mapped to “01-XXXX-XXXX–0000”. The programmable range of UV
thresholds is approximately 1.58 to 3.1 V, but this is subject to variation due to the (GAIN, OFFSET) linear
equation used to map the ADC values.
Protection Upper 2 MSB Middle 8 Bits Lower 4 LSB
OV 10 Set in OV_TRIP Register 1000
UV 01 Set in UV_TRIP Register 0000
NOTE
To support flexible cell configurations within bq76920, bq76930, and bq76940, UV is ignored
on any cells that have a reading under UVMINQUAL. This allows cell pins to be shorted in
implementations where not all cells are needed (for example, 6-series cells using the
bq76930).
Default protection thresholds and delays are shown in the register description at the end of this datasheet.
These are loaded into the digital register (RAM) of the device when the device enters NORMAL mode.
These RAM values may then be overwritten by the host controller to any other values, which they will
retain until a POR event. It is recommended that the host controller reload these values during its standard
power-up and/or re-initialization sequence.
To calculate the correct OV_TRIP and UV_TRIP register values for a device, use the following procedure:
1. Determine desired OV.
2. Read out [ADCGAIN] and [ADCOFFSET] from their corresponding registers. Note that ADCGAIN is
stored in units of µV/LSB, while ADCOFFSET is stored in mV.
3. Calculate the full 14-bit ADC value needed to meet the desired OV and UV trip thresholds as follows:
(a) OV_TRIP_FULL = (OV ADCOFFSET) ÷ ADCGAIN
(b) UV_TRIP_FULL = (UV ADCOFFSET) ÷ ADCGAIN
4. Remove the upper 2 MSB and lower 4 LSB from the full 14-bit value, retaining only the remaining
middle 8 bits. This can be done by shifting the OV_TRIP_FULL and UV_TRIP_FULL binary values 4
bits to the right and removing the upper 2 MSB.
5. Write OV_TRIP and UV_TRIP to their corresponding registers.
clamps at ~ 18 V, R1 will limit current to approximately
(V(PACK±) - 18) / R1.
DSG CHG
Q3 is a low-cost PCH FET and is used to keep CHG away
from any voltages below VSS. When CHG is not being
pulled high, PACK± being pulled below VSS will not be
seen by CHG as Q2 does not turn on. Q3 also allows R2 to
keep Q1 OFF, since all voltages below this FET can
Q3 "follow" PACK± as it goes below VSS.
This diode allows CHG
to pull the Q1 gate high.
R1 drops the voltage when PACK± is pulled high and
R1 limits the current going into the CHG pin. Since CHG
(1M)
BAT ±
R2
Q2
R2
This zener clamp may
be needed to prevent
Q1 from turning on
too quickly (optional).
PACK t
Rsns R2 clamps Q1 when
CHG is turned off.
(1M)
Q1
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Both OV and UV protections require the ADC to be enabled. Ensure that the [ADC_EN] bit is set to 1 if
OV and UV protections are needed.
7.3.1.2.2 Reduced Test Time
A special debug and test configuration bit is provided in the SYS_CTRL2 register, called [DELAY_DIS].
Setting [DELAY_DIS] bypasses the OV/UV protection fault timers and allows a fault condition to be
registered within 200 ms after application of such a fault condition.
7.3.1.3 Control Subsystem
7.3.1.3.1 FET Driving (CHG AND DSG)
Each bq769x0 device provides two low-side FET drivers, CHG and DSG, which control NCH power FETs
or may be used as a signal to enable various other circuits such as a high-side NCH charge pump circuit.
Both DSG and CHG drivers have a fast pull-up to nominally 12 V when enabled. DSG uses a fast pull-
down to VSS when disabled, while CHG utilizes a high impedance (nominally 1 MΩ) pull-down path when
disabled.
An additional internal clamp circuit ensures that the CHG pin does not exceed a maximum of 20 V.
Figure 7-3. CHG and DSG FET Circuit
The power path for the CHG and DSG pull-up circuit originates from the REGSRC pin, instead of BAT.
To enable the CHG fet, set the [CHG_ON] register bit to 1; to disable, set [CHG_ON] = 0. The discharge
FET may be similarly controlled through the [DSG_ON] register bit.
Certain fault conditions or power state transitions will clear the state of the CHG/DSG FET controls.
Table 7-1 shows what action, if any, to take to [CHG_ON] and [DSG_ON] in response to various system
events:
Table 7-1. CHG, DSG Response Under Various System Events
EVENT [CHG_ON] [DSG_ON]
OV Fault Set to 0
UV Fault Set to 0
OCD Fault Set to 0
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Table 7-1. CHG, DSG Response Under Various System Events (continued)
EVENT [CHG_ON] [DSG_ON]
SCD Fault Set to 0
ALERT Override Set to 0 Set to 0
DEVICE_XREADY is set Set to 0 Set to 0
Enter SHIP mode from NORMAL Set to 0 Set to 0
NOTE
All protection recovery must be initiated by the host microcontroller. In order to resume FET
operation after a fault condition has occurred, the host microcontroller must first clear the
corresponding status bit in the SYS_STAT register, which will clear the ALERT pin, and then
manually re-enable the CHG and/or DSG bit. Certain faults, such as OV or UV, may
immediately re-toggle if such a condition still persists. Refer to Table 7-3 for details on
clearing status bits.
There are no conditions under which the bq769x0 automatically sets either [CHG_ON] or [DSG_ON] to 1.
7.3.1.3.2 Load Detection
A load detection circuit is present on the CHG pin and activated whenever the CHG FET is disabled
([CHG_ON] = 0). This circuit detects if the CHG pin is externally pulled high when the high impedance
(approximately 1 MΩ) pull-down path should actually be holding the CHG pin to VSS, and is useful for
determining if the PACK– pin (outside of the AFE) is being held at a high voltage—for example, if the load
is present while the power FETs are off. The state of the load detection circuit is read from the
[LOAD_PRESENT] bit of the SYS_CTRL1 register.
After an OCD or SCD fault has occurred, the DSG FET will be disabled ([DSG_ON] cleared), and the
CHG FET must similarly be explicitly disabled to activate the load detection circuit. The host
microcontroller may periodically poll the [LOAD_PRESENT] bit to determine the state of the PACK– pin
and determine when the load is removed ([LOAD_PRESENT] = 0).
7.3.1.3.3 Cell Balancing
Both internal and external passive cell balancing options are fully supported by the bq76920, while
external cell balancing is recommended for bq76930 and bq76940. It is left to the host controller to
determine the exact balancing algorithm to be used in any given system. Each bq769x0 device provides
the cell voltages and balancing drivers to enable this. If using the internal cell balance drivers, up to 50 mA
may be balanced per cell. If using external cell balancing, much higher balancing currents may be
employed.
To activate a particular cell balancing channel, simply set the corresponding bit for that cell in the
CELLBAL1, CELLBAL2, or CELLBAL3 register. For example, VC1–VC0 is enabled by setting [CB1], while
VC12–VC11 is set through [CB12].
Multiple cells may be simultaneously balanced. It is left to the user’s discretion to determine the ideal
number of cells to concurrently balance. Adjacent cells should not be balanced simultaneously. This may
cause cell pins to exceed their absolute maximum conditions and is also not recommended for external
balancing implementations. Additionally, if internal balancing is used, care should be taken to avoid
exceeding package power dissipation ratings.
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NOTE
The host controller must ensure that no two adjacent cells are balanced simultaneously
within each set of the following:
VC1–VC5
VC6–VC10
VC11–VC15
The total duty cycle devoted to balancing is approximately 70% per 250 ms. This is because a portion of
the 250 ms is allotted for normal cell voltage measurements through the ADC.
If [ADC_EN] =1, OV and UV protections are not affected by cell balancing, since the cell balancing is
temporarily suspended for a small slice of time every 250 ms during which the cell voltage readings are
taken. This ensures that the OV and UV protections do not accidentally trigger, or miss an actual OV/UV
condition on the cells while balancing is enabled.
NOTE
All cell balancing control bits in CELLBAL1, CELLBAL2, and CELLBAL3 are automatically
cleared under the following events, and must be explicitly re-written by the host
microcontroller following clearing of the event:
DEVICE_XREADY is set
Enters NORMAL mode from SHIP mode
7.3.1.3.4 Alert
The ALERT pin serves as an active high digital interrupt signal that can be connected to a GPIO port of
the host microcontroller. This signal is an OR of all bits in the SYS_STAT register.
In order to clear the ALERT signal, the source bit in the SYS_STAT register must first be cleared by
writing a “1” to that bit. This will cause an automatic clear of the ALERT pin once all bits are cleared.
The ALERT pin may also be driven by an external source; for example, the pack may include a secondary
overvoltage protector IC. When the ALERT pin is forced high externally while low, the device will
recognize this as an OVRD_ALERT fault and set the [OVRD_ALERT] bit. This triggers automatic disabling
of both CHG and DSG FET drivers. The device cannot recognize the ALERT signal input high when it is
already forcing the ALERT signal high from another condition.
The ALERT pin has no internal debounce support so care should be taken to protect the pin from noise or
other parasitic transients.
NOTE
It is highly recommended to place an external 500 kΩ–1 MΩpull-down resistor from ALERT
to VSS as close to the IC as possible. Additional recommendations are:
a) To keep all traces between the IC and components connected to the ALERT pin very
short.
b) To include a guard ring around the components connected to the ALERT pin and the
pin itself.
7.3.1.3.5 Output LDO
An adjustable output voltage regulator LDO is provided as a simple way to provide power to additional
components in the battery pack, such as the host microcontroller or LEDs. The LDO is configured in
EEPROM by TI during the production test process, and can support 2.5-V or 3.3-V options.
A6 A5 A0
... R7R/W R6 R0
...
D0
... C7 C6 C0
...
Start Slave Address Register
Address
Stop
SCL
SDA A6 A5 A0
... R/WACK ACK ACK
D7 D6 ACK NACK
Slave Address
Slave
Drives CRC
(optional) Master
Drives NACK
Slave
Drives Data
Repeated
Start
A6 A5 A0
... R7R/W R6 R0
... D7 D6 D0
... C7 C6 C0
...
Start Slave Address Register
Address Data CRC
(optional) Stop
SCL
SDA ACK ACK ACK ACK
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A cascode small-signal FET must be added in the external path between BAT and REGSRC with the
bq76930 and bq76940. This helps drop most of the power dissipation outside of the package and cuts
down on package power dissipation.
7.3.1.4 Communications Subsystem
The AFE implements a standard 100-kHz I2C interface and acts as a slave device. The I2C device
address is 7-bits and is factory programmed. Consult the Device Comparison Table (Section 4) of this
datasheet for more information.
A write transaction is shown in Figure 7-4. Block writes are allowed by sending additional data bytes
before the Stop. The I2C block will auto-increment the register address after each data byte.
When enabled, the CRC is calculated as follows:
In a single-byte write transaction, the CRC is calculated over the slave address, register address, and
data.
In a block write transaction, the CRC for the first data byte is calculated over the slave address,
register address, and data. The CRC for subsequent data bytes is calculated over the data byte only.
The CRC polynomial is x8 + x2 + x + 1, and the initial value is 0.
When the slave detects a bad CRC, the I2C slave will NACK the CRC, which causes the I2C slave to go to
an idle state.
Figure 7-4. I2C Write
Figure 7-5 shows a read transaction using a Repeated Start.
Figure 7-5. I2C Read with Repeated Start
Figure 7-6 shows a read transaction where a Repeated Start is not used, for example if not available in
hardware. For a block read, the master ACK’s each data byte except the last and continues to clock the
interface. The I2C block will auto-increment the register address after each data byte.
When enabled, the CRC for a read transaction is calculated as follows:
In a single-byte read transaction, the CRC is calculated after the second start and uses the slave
address and data byte.
A6 A5 A0
... R7R/W R6 R0
...
D0
... C7 C6 C0
...
Start Slave Address Register
Address
Stop
SCL
SDA A6 A5 A0
... R/WACK ACK ACK
D7 D6 ACK NACK
Slave Address
Slave
Drives CRC
(optional) Master
Drives NACK
Slave
Drives Data
Stop Start
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In a block read transaction, the CRC for the first data byte is calculated after the second start and uses
the slave address and data byte. The CRC for subsequent data bytes is calculated over the data byte
only.
The CRC polynomial is x8 + x2 + x + 1, and the initial value is 0.
When the master detects a bad CRC, the I2C master will NACK the CRC, which causes the I2C slave to
go to an idle state.
Figure 7-6. I2C Read Without Repeated Start
7.4 Device Functional Modes
Each bq769x0 device supports the following modes of operation.
Table 7-2. Supported Power Modes
Mode Description
NORMAL Fully operational state. Both ADC and CC may be on, or disabled by host microcontroller.
OV and UV protection enabled if ADC is on. OCD and SCD enabled. ADC and CC may be
disabled to reduce power consumption, and CC may be operated in a “1-SHOT” mode for
flexible power savings.
SHIP Lowest possible power state, intended for pack assembly and/or long term pack storage.
Must see a BOOT signal (> 1 VBOOT) on TS1 pin to boot from SHIP NORMAL. Note
that the device always enters SHIP mode upon POR.
7.4.1 NORMAL Mode
NORMAL mode represents the fully operational mode where all blocks are enabled and the device sees
its highest current consumption. In this mode, certain blocks/functions may be disabled to save
power—these include the ADC and CC. OV and UV are running continuously as long as the ADC is
enabled. The OCD and SCD comparators may not be disabled in this mode.
Transitioning from NORMAL to SHIP mode is also initiated by the host, and requires consecutive writes to
two bits in the SYS_CTRL1 register.
7.4.2 SHIP Mode
SHIP mode is the basic and lowest power mode that bq769x0 supports. SHIP mode is automatically
entered during initial pack assembly and after every POR event. When the device is in NORMAL mode, it
may enter SHIP by the host controller through a specific sequence of I2C commands.
In SHIP mode, only a minimum of blocks are turned on, including the VSTUP power supply and primal
boot detector. Waking from SHIP mode to NORMAL mode requires pulling the TS1 pin greater than
VBOOT, which triggers the device boot-up sequence.
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To enter SHIP mode from NORMAL mode, the [SHUT_A] and [SHUT_B] bits in the SYS_CTRL1 register
must be written with specific patterns across two consecutive writes:
Write #1: [SHUT_A] = 0, [SHUT_B] = 1
Write #2: [SHUT_A] = 1, [SHUT_B] = 0
Note that [SHUT_A] and [SHUT_B] should each be in a 0 state prior to executing the shutdown command
above. If this specific sequence is entered into the device, the device transitions into SHIP mode. If any
other sequence is written to the [SHUT_A] and [SHUT_B] bits or if either of the two patterns is not
correctly entered, the device will not enter SHIP mode.
CAUTION
DO NOT OPERATE THE DEVICE BELOW POR. When designing with the
bq76940, the intermediate voltages (BAT–VC10x), (VC10x–VC5x), and
(VC5x–VSS) must each never fall below VSHUT. When this occurs, a full device
reset must be initiated by powering down all three intermediate voltages
(BAT–VC10x), (VC10x–VC5x), and (VC5x–VSS) below VSHUT and rebooting by
applying the appropriate VBOOT signal to the TS1 pin. When designing with
the bq76930, the intermediate voltages (BAT–VC5x) and (VC5x–VSS) must
each never fall below VSHUT. If this occurs, a full device reset must be initiated
by powering down both intermediate voltages (BAT–VC5x) and (VC5x–VSS)
below VSHUT and rebooting by applying the appropriate VBOOT signal to the
TS1 pin.
The device will also enter SHIP mode during a POR event; however, this is not a recommended method
of SHIP mode entry. If any of the supply-side voltages below fall below VSHUT and then back up above
VPORA, the device defaults into the SHIP mode state. This is similar to an initial pack assembly condition.
In order to exit SHIP mode into NORMAL mode, the device must follow the standard boot sequence by
applying a voltage greater than the VBOOT threshold on the TS1 pin.
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(1) These registers are only valid for bq76930 and bq76940.
(2) These registers are only valid for bq76940.
7.5 Register Maps
Name Addr D7 D6 D5 D4 D3 D2 D1 D0
SYS_STAT 0x00 CC_READY RSVD DEVICE_
XREADY OVRD_
ALERT UV OV SCD OCD
CELLBAL1 0x01 RSVD RSVD RSVD CB<5:1>
CELLBAL2(1) 0x02 RSVD RSVD RSVD CB<10:6>
CELLBAL3(2) 0x03 RSVD RSVD RSVD CB<15:11>
SYS_CTRL1 0x04 LOAD_
PRESENT RSVD RSVD ADC_EN TEMP_SEL RSVD SHUT_A SHUT_B
SYS_CTRL2 0x05 DELAY_DIS CC_EN CC_
ONESHOT RSVD DSG_ON CHG_ON
PROTECT1 0x06 RSNS RSVD RSVD SCD_DELAY SCD_THRESH
PROTECT2 0x07 RSVD OCD_DELAY OCD_THRESH
PROTECT3 0x08 UV_DELAY OV_DELAY RSVD
OV_TRIP 0x09 OV_THRESH
UV_TRIP 0x0A UV_THRESH
CC_CFG 0x0B RSVD RSVD Must be programmed to 0x19
VC1_HI 0x0C RSVD RSVD <13:8>
VC1_LO 0x0D <7:0>
VC2_HI 0x0E RSVD RSVD <13:8>
VC2_LO 0x0F <7:0>
VC3_HI 0x10 RSVD RSVD <13:8>
VC3_LO 0x11 <7:0>
VC4_HI 0x12 RSVD RSVD <13:8>
VC4_LO 0x13 <7:0>
VC5_HI 0x14 RSVD RSVD <13:8>
VC5_LO 0x15 <7:0>
VC6_HI(1) 0x16 RSVD RSVD <13:8>
VC6_LO(1) 0x17 <7:0>
VC7_HI(1) 0x18 RSVD RSVD <13:8>
VC7_LO(1) 0x19 <7:0>
VC8_HI(1) 0x1A RSVD RSVD <13:8>
VC8_LO(1) 0x1B <7:0>
VC9_HI(1) 0x1C RSVD RSVD <13:8>
VC9_LO(1) 0x1D <7:0>
VC10_HI(1) 0x1E RSVD RSVD <13:8>
VC10_LO(1) 0x1F <7:0>
VC11_HI(2) 0x20 RSVD RSVD <13:8>
VC11_LO(2) 0x21 <7:0>
VC12_HI(2) 0x22 RSVD RSVD <13:8>
VC12_LO(2) 0x23 <7:0>
VC13_HI(2) 0x24 RSVD RSVD <13:8>
VC13_LO(2) 0x25 <7:0>
VC14_HI(2) 0x26 RSVD RSVD <13:8>
VC14_LO(2) 0x27 <7:0>
VC15_HI(2) 0x28 RSVD RSVD <13:8>
VC15_LO(2) 0x29 <7:0>
BAT_HI 0x2A <15:8>
BAT_LO 0x2B <7:0>
TS1_HI 0x2C RSVD RSVD <13:8>
TS1_LO 0x2D <7:0>
TS2_HI(1) 0x2E RSVD RSVD <13:8>
TS2_LO(1) 0x2F <7:0>
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Name Addr D7 D6 D5 D4 D3 D2 D1 D0
TS3_HI(2) 0x30 RSVD RSVD <13:8>
TS3_LO(2) 0x31 <7:0>
CC_HI 0x32 <15:8>
CC_LO 0x33 <7:0>
ADCGAIN1 0x50 RSVD ADCGAIN<4:3> RSVD
ADCOFFSET 0x51 ADCOFFSET<7:0>
ADCGAIN2 0x59 ADCGAIN<2:0> RSVD
7.5.1 Register Details
Table 7-3. SYS_STAT (0x00)
BIT76543210
NAME CC_READY RSVD DEVICE_
XREADY OVRD_
ALERT UV OV SCD OCD
RESET00000000
ACCESS RW RW RW RW RW RW RW RW
NOTE
Bits in SYS_STAT may be cleared by writing a "1" to the corresponding bit.
Writing a "0" does not change the state of the corresponding bit.
CC_READY (Bit 7): Indicates that a fresh coulomb counter reading is available. Note that if this bit is not
cleared between two adjacent CC readings becoming available, the bit remains latched to 1. This bit may
only be cleared (and not set) by the host.
0 = Fresh CC reading not yet available or bit is cleared by host microcontroller.
1 = Fresh CC reading is available. Remains latched high until cleared by host.
RSVD (Bit 6): Reserved. Do not use.
DEVICE_XREADY (Bit 5): Internal chip fault indicator. When this bit is set to 1, it should be cleared by
the host. May be set due to excessive system transients. This bit may only be cleared (and not set) by
the host.
0 = Device is OK.
1 = Internal chip fault detected, recommend that host microcontroller clear this bit after waiting a
few seconds. Remains latched high until cleared by the host.
OVRD_ALERT (Bit 4): External pull-up on the ALERT pin indicator. Only active when ALERT pin is not
already being driven high by the AFE itself.
0 = No external override detected
1 = External override detected. Remains latched high until cleared by the host.
UV (Bit 3): Undervoltage fault event indicator.
0 = No UV fault is detected.
1 = UV fault is detected. Remains latched high until cleared by the host.
OV (Bit 2): Overvoltage fault event indicator.
0 = No OV fault is detected.
1 = OV fault is detected. Remains latched high until cleared by the host.
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SCD (Bit 1): Short circuit in discharge fault event indicator.
0 = No SCD fault is detected.
1 = SCD fault is detected. Remains latched high until cleared by the host.
OCD (Bit 0): Over current in discharge fault event indicator.
0 = No OCD fault is detected.
1 = OCD fault is detected. Remains latched high until cleared by the host.
Table 7-4. CELLBAL1 (0x01) for bq76920, bq76930, and bq76940
BIT76543210
NAME CB5 CB4 CB3 CB2 CB1
RESET00000000
ACCESS R R R RW RW RW RW RW
CBx (Bits 4–0):
0 = Cell balancing on Cell “x” is disabled.
1 = Cell balancing on Cell “x” is enabled.
Table 7-5. CELLBAL2 (0x02) for bq76930 and bq76940
BIT76543210
NAME CB10 CB9 CB8 CB7 CB6
RESET00000000
ACCESS R R R RW RW RW RW RW
CBx (Bits 4–0):
0 = Cell balancing on Cell “x” is disabled.
1 = Cell balancing on Cell “x” is enabled.
Table 7-6. CELLBAL3 (0x03) for bq76940
BIT76543210
NAME CB15 CB14 CB13 CB12 CB11
RESET00000000
ACCESS R R R RW RW RW RW RW
CBx (Bits 4–0):
0 = Cell balancing on Cell “x” is disabled.
1 = Cell balancing on Cell “x” is enabled.
Table 7-7. SYS_CTRL1 (0x04)
BIT76543210
NAME LOAD_
PRESENT ADC_EN TEMP_SEL RSVD SHUT_A SHUT_B
RESET00000000
ACCESS R R R RW RW RW RW RW
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LOAD_PRESENT (Bit 7): Valid only when [CHG_ON] = 0. Is high if CHG pin is detected to exceed
VLOAD_DETECT while CHG_ON = 0, which suggests that external load is present. Note this bit is read-
only and automatically clears when load is removed.
0 = CHG pin < VLOAD_DETECT or [CHG_ON] = 1.
1 = CHG pin >VLOAD_DETECT, while [CHG_ON] = 0.
ADC_EN (Bit 4): ADC enable command
0 = Disable voltage and temperature ADC readings (also disables OV protection)
1 = Enable voltage and temperature ADC readings (also enables OV protection)
TEMP_SEL (Bit 3): TSx_HI and TSx_LO temperature source
0 = Store internal die temperature voltage reading in TSx_HI and TSx_LO
1 = Store thermistor reading in TSx_HI and TSx_LO (all thermistor ports)
RSVD (Bit 2): Reserved, do not set to 1.
SHUT_A, SHUT_B (Bits 1–0): Shutdown command from host microcontroller. Must be written in a
specific sequence, shown below:
Starting from: [SHUT_A] = 0, [SHUT_B] = 0
Write #1: [SHUT_A] = 0, [SHUT_B] = 1
Write #2: [SHUT_A] = 1, [SHUT_B] = 0
Other writes cause the command to be ignored.
Table 7-8. SYS_CTRL2 (0x05)
BIT76543210
NAME DELAY_DIS CC_EN CC_
ONESHOT RSVD RSVD RSVD DSG_ON CHG_ON
RESET00000000
ACCESS RW RW RW RW RW RW RW RW
DELAY_DIS (Bit 7): Disable OV, UV, OCD, and SCD delays for faster customer production testing.
0 = Normal delay settings
1 = OV, UV, OCD, and SCD delay circuit is bypassed, creating zero delay (approximately
250 ms).
CC_EN (Bit 6): Coulomb counter continuous operation enable command. If set high, [CC_ONESHOT] bit
is ignored.
0 = Disable CC continuous readings
1 = Enable CC continuous readings and ignore [CC_ONESHOT] state
CC_ONESHOT (Bit 5): Coulomb counter single 250-ms reading trigger command. If set to 1, the
coulomb counter will be activated for a single 250-ms reading, and then turned back off.
[CC_ONESHOT] will also be cleared at the conclusion of this reading, while [CC_READY] bit will be set
to 1. 0 = No action
1 = Enable single CC reading (only valid if [CC_EN] = 0), and [CC_READY] = 0)
RSVD (Bit 4–2): Reserved. Do not use.
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DSG_ON (Bit 1): Discharge FET driver (low side NCH) or discharge signal control
0 = DSG is off.
1 = DSG is on.
CHG_ON (Bit 0): Discharge FET driver (low side NCH) or discharge signal control
0 = CHG is off.
1 = CHG is on.
Table 7-9. PROTECT1 (0x06)
BIT76543210
NAME RSNS RSVD SCD_D1 SCD_D0 SCD_T2 SCD_T1 SCD_T0
RESET00000000
ACCESS RW R RW RW RW RW RW RW
RSNS (Bit 7): Allows for doubling the OCD and SCD thresholds simultaneously
0 = OCD and SCD thresholds at lower input range
1 = OCD and SCD thresholds at upper input range
RSVD (Bit 5): Reserved, do not set to 1.
SCD_D1:0 (Bits 4–3):
Short circuit in discharge delay setting. A 400-µs setting is recommended only in systems using
maximum cell measurement input resistance, Rc, of 1 kΩ(which corresponds to minimum internal cell
balancing current or external cell balancing configuration).
Code (in µs)
0x0 70
0x1 100
0x2 200
0x3 400
SCD_T2:0 (Bits 2–0): Short circuit in discharge threshold setting
Code RSNS = 1 (in mV) RSNS = 0 (in mV)
0x0 44 22
0x1 67 33
0x2 89 44
0x3 111 56
0x4 133 67
0x5 155 78
0x6 178 89
0x7 200 100
Table 7-10. PROTECT2 (0x07)
BIT76543210
NAME OCD_D2 OCD_D1 OCD_D0 OCD_T3 OCD_T2 OCD_T1 OCD_T0
RESET00000000
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Table 7-10. PROTECT2 (0x07) (continued)
BIT76543210
ACCESS R RW RW RW RW RW RW RW
OCD_D2:0 (Bits 6–4): Overcurrent in discharge delay setting
Code (in ms)
0x0 8
0x1 20
0x2 40
0x3 80
0x4 160
0x5 320
0x6 640
0x7 1280
OCD_T3:0 (Bits 3–0): Overcurrent in discharge threshold setting.
Code RSNS = 1 (in mV) (RSNS = 0 (in mV)
0x0 17 8
0x1 22 11
0x2 28 14
0x3 33 17
0x4 39 19
0x5 44 22
0x6 50 25
0x7 56 28
0x8 61 31
0x9 67 33
0xA 72 36
0xB 78 39
0xC 83 42
0xD 89 44
0xE 94 47
0xF 100 50
Table 7-11. PROTECT3 (0x08)
BIT76543210
NAME UV_D1 UV_D0 OV_D1 OV_D0 RSVD RSVD RSVD RSVD
RESET00000000
ACCESS RW RW RW RW RW RW RW RW
UV_D1:0 (Bits 7–6): Undervoltage delay setting
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Code (in s)
0x0 1
0x1 4
0x2 8
0x3 16
OV_D1:0 (Bits 5–4): Overvoltage delay setting
Code (in s)
0x0 1
0x1 2
0x2 4
0x3 8
RSVD (Bits 3–0): These bits are for TI internal debug use only and must be configured to the default
settings indicated.
Table 7-12. OV_TRIP (0x09)
BIT76543210
NAME OV_T7 OV_T6 OV_T5 OV_T4 OV_T3 OV_T2 OV_T1 OV_T0
RESET10101100
ACCESS RW RW RW RW RW RW RW RW
OV_T7:0 (Bits 7–0): Middle 8 bits of the direct ADC mapping of the desired OV protection threshold,
with upper 2 MSB set to 10 and lower 2 LSB set to 1000. The equivalent OV threshold is mapped to:
10-OV_T<7:0>1000.
By default, OV_TRIP is configured to a 0xAC setting.
Note that OV_TRIP is based on the ADC voltage, which requires back-calculation using the GAIN and
OFFSET values stored in ADCGAIN<4:0>and ADCOFFSET<7:0>.
Table 7-13. UV_TRIP (0x0A)
BIT76543210
NAME UV_T7 UV_T6 UV_T5 UV_T4 UV_T3 UV_T2 UV_T1 UV_T0
RESET10010111
ACCESS RW RW RW RW RW RW RW RW
UV_T7:0 (Bits 7–0): Middle 8 bits of the direct ADC mapping of the desired UV protection threshold, with
upper 2 MSB set to 01 and lower 4 LSB set to 0000. In other words, the equivalent OV threshold is
mapped to: 01-UV_T<7:0>–0000.
By default, UV_TRIP is configured to a 0x97 setting. .
Note that UV_TRIP is based on the ADC voltage, which requires back-calculation using the GAIN and
OFFSET values stored in ADCGAIN<4:0>and ADCOFFSET<7:0>.
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Table 7-14. CC_CFG REGISTER (0x0B)
BIT76543210
NAME CC_CFG5 CC_CFG4 CC_CFG3 CC_CFG2 CC_CFG1 CC_CFG0
RESET00000000
ACCESS R R RW RW RW RW RW RW
CC_CFG5:0 (Bits 5–0): For optimal performance, these bits should be programmed to 0x19 upon device
startup.
7.5.2 Read-Only Registers
Table 7-15. CELL VOLTAGE REGISTERS
VC1_HI, _LO (0x0C–0x0D), VC2_HI, _LO (0x0E–0x0F), VC3_HI, _LO (0x10–0x11), VC4_HI, _LO (0x12–0x13), VC5_HI, _LO
(0x14–0x15) / bq76930, bq76940: VC6_HI, _LO (0x16–0x17), VC7_HI, _LO (0x18–0x19), VC8_HI, _LO (0x1A–0x1B), VC9_HI, _LO
(0x1C–0x1D), VC10_HI, _LO (0x1E–0x1F) / bq76940: VC11_HI, _LO (0x20–0x21), VC12_HI, _LO (0x22–0x23), VC13_HI, _LO
(0x24–0x25), VC14_HI, _LO (0x26–0x27), VC15_HI, _LO (0x28–0x29)
BIT76543210
NAME D13 D12 D11 D10 D9 D8
RESET00000000
NAME D7 D6 D5 D4 D3 D2 D1 D0
RESET00000000
D11:8 (Bits 3–0): Cell “x” ADC reading, upper 6 MSB. Always returned as an atomic value if both high
and low registers are read in the same transaction (using address auto-increment).
D7:0 (Bits 7–0): Cell ”x” ADC reading, lower 8 LSB.
Table 7-16. BAT_HI (0x2A) and BAT_LO (0x2B)
BIT76543210
NAME D15 D14 D13 D12 D11 D10 D9 D8
RESET00000000
NAME D7 D6 D5 D4 D3 D2 D1 D0
RESET00000000
D15:8 (Bits 7–0): BAT calculation based on adding up Cells 1–15, upper 8 MSB. Always returned as an
atomic value if both high and low registers are read in the same transaction (using address auto-
increment).
D7:0 (Bits 7–0): BAT calculation based on adding up Cells 1–15, lower 8 LSB
Table 7-17. TS1_HI (0x2C) and TS1_LO (0x2D)
BIT76543210
NAME D13 D12 D11 D10 D9 D8
RESET00000000
NAME D7 D6 D5 D4 D3 D2 D1 D0
RESET00000000
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D11:8 (Bits 3–0): TS1 or DIETEMP ADC reading, upper 6 MSB. Always returned as an atomic value if
both high and low registers are read in the same transaction (using address auto-increment).
D7:0 (Bits 7–0): TS1 or DIETEMP ADC reading, lower 8 LSB
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Table 7-18. TS2_HI (0x2E) and TS2_LO (0x2F)
BIT76543210
NAME D13 D12 D11 D10 D9 D8
RESET00000000
NAME D7 D6 D5 D4 D3 D2 D1 D0
RESET00000000
D11:8 (Bits 3–0): TS2 ADC reading, upper 6 MSB. Always returned as an atomic value if both high and
low registers are read in the same transaction (using address auto-increment).
D7:0 (Bits 7–0): TS2 ADC reading, lower 8 LSB
Table 7-19. TS3_HI (0x30) and TS3_LO (0x31)
BIT76543210
NAME D13 D12 D11 D10 D9 D8
RESET00000000
NAME D7 D6 D5 D4 D3 D2 D1 D0
RESET00000000
D11:8 (Bits 3–0): TS3 ADC reading, upper 6 MSB. Always returned as an atomic value if both high and
low registers are read in the same transaction (using address auto-increment).
D7:0 (Bits 7–0): TS3 ADC reading, lower 8 LSB
Table 7-20. CC_HI (0x32) and CC_LO (0x33)
BIT76543210
NAME CC15 CC14 CC13 CC12 CC11 CC10 CC9 CC8
RESET00000000
NAME CC7 CC6 CC5 CC4 CC3 CC2 CC1 CC0
RESET00000000
CC15:8 (Bits 7–0): Coulomb counter upper 8 MSB. Always returned as an atomic value if both high and
low registers are read in the same transaction (using address auto-increment).
CC7:0 (Bits 7–0): Coulomb counter lower 8 LSB
Table 7-21. ADCGAIN1 (0x50)
BIT76543210
NAME ADCGAIN4 ADCGAIN3
RESET————————
ACCESS R R R R R R R R
Table 7-22. ADCGAIN2 (0x59)
BIT76543210
NAME ADCGAIN2 ADCGAIN1 ADCGAIN0
RESET————————
ACCESS R R R R R R R R
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ADCGAIN4:3 (Bits 3–2, address 0x50):
ADC GAIN
offset upper 2 MSB
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ADCGAIN2:0 (Bits 7–5, address 0x59):
ADC GAIN offset lower 3 LSB
ADCGAIN<4:0> is a production-trimmed value for the ADC transfer function, in
units of µV/LSB. The range is 365 µV/LSB to 396 µV/LSB, in steps of 1 µV/LSB,
and may be calculated as follows:
GAIN = 365 µV/LSB + (ADCGAIN<4:0>in decimal) × (1 µV/LSB)
Alternately, a conversion table is provided below:
ADC GAIN Gain (µV/LSB) ADC GAIN Gain (µV/LSB)
0x00 365 0x10 381
0x01 366 0x11 382
0x02 367 0x12 383
0x03 368 0x13 384
0x04 369 0x14 385
0x05 370 0x15 386
0x06 371 0x16 387
0x07 372 0x17 388
0x08 373 0x18 389
0x09 374 0x19 390
0x0A 375 0x1A 391
0x0B 376 0x1B 392
0x0C 377 0x1C 393
0x0D 378 0x1D 394
0x0E 379 0x1E 395
0x0F 380 0x1F 396
Table 7-23. ADCOFFSET (0x51)
BIT76543210
NAME ADC
OFFSET7 ADC
OFFSET6 ADC
OFFSET5 ADC
OFFSET4 ADC
OFFSET3 ADC
OFFSET2 ADC
OFFSET1 ADC
OFFSET0
RESET————————
ACCESS R R R R R R R R
ADCOFFSET7:0 (Bits 7–0):
ADC offset, stored in 2’s complement format in mV units. Positive full-scale range
corresponds to 0x7F and negative full-scale corresponds to 0x80. The full-scale
input range is –128 mV to 127 mV, with an LSB of 1 mV.
The table below shows example offsets.
ADCOFFSET Offset (mV)
0x00 0
0x01 1
0x7F 127
0x80 –128
0x81 –127
0xFF –1
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8 Application and Implementation
NOTE
Information in the following application section is not part of the TI component specification,
and TI does not warrant its accuracy or completeness. TI’s customers are responsible for
determining suitability of components for their purposes. Customers should validate and test
their design implementation to confirm system functionality.
8.1 Application Information
The bq769x0 family of battery monitoring AFEs enabling cell parametric measurement and protection is a
variety of 3-series to 15-series Li-Ion/Li Polymer battery packs.
To evaluate the performance and configurations of the device users need the bq76940, bq76930, and
bq76920 Evaluation Software, (SLUCC539) tool to configure the internal registers for a specific battery
pack and application. The Evaluation Software tool is a graphical user-interface tool installed on a PC
during development. This can be used in conjunction with the bq76920EVM, bq76930EVM or
bq76940EVM.
The bq769x0 devices are expected to be implemented in a system with a microcontroller that can perform
additional functions based on the data made collected. The bq78350 is one example of a companion to
the bq769x0 family.
8.1.1 Configuring Alternative Cell Counts
Each bq769x0 family of IC's support a variety of cell counts. The following tables provide guidance on
which device and which input pins to use, depending on the number of cells in the pack.
Table 8-1. Cell Connections for bq76920
Cell Input 3 Cells 4 Cells 5 Cells
VC5–VC4 CELL 3 CELL 4 CELL 5
VC4–VC3 short short CELL 4
VC3–VC2 short CELL 3 CELL 3
VC2–VC1 CELL 2 CELL 2 CELL 2
VC1–VC0 CELL 1 CELL 1 CELL 1
Table 8-2. Cell Connections for bq76930
Cell Input 6 Cells 7 Cells 8 Cells 9 Cells 10 Cells
VC10–VC9 CELL 6 CELL 7 CELL 8 CELL 9 CELL 10
VC9–VC8 short short short short CELL 9
VC8–VC7 short short CELL 7 CELL 8 CELL 8
VC7–VC6 CELL 5 CELL 6 CELL 6 CELL 7 CELL 7
VC6–VC5b CELL 4 CELL 5 CELL 5 CELL 6 CELL 6
VC5–VC4 CELL 3 CELL 4 CELL 4 CELL 5 CELL 5
VC4–VC3 short short short CELL 4 CELL 4
VC3–VC2 short CELL 3 CELL 3 CELL 3 CELL 3
VC2–VC1 CELL 2 CELL 2 CELL 2 CELL 2 CELL 2
VC1–VC0 CELL 1 CELL 1 CELL 1 CELL 1 CELL 1
Rc
Rc
Rc
Rc
Rsns
Cc
Cc
Cc
Cc
Cc
100
0.1 µF
4.7 µF
BAT
VC5
VC4
VC3
VC2
VC1
VSS
SCL
SDA
CHG
DSG
REGSRC
REGOUT
SRN
SRP
VC0
CAP1
TS1 Cf
100
0.1 µF
1 µF
Rc
Rf
1M1M
Rc
10k
ALERT
1M
PUSH-BUTTON FOR BOOT
VCC
GPIO
SDA
SCL
VSS
Cc
1 µF
0.1 µF
10 kΩ
PACK +
PACK
Companion
Controller
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Table 8-3. Cell Connections for bq76940
Cell Input 9 Cells 10 Cells 11 Cells 12 Cells 13 Cells 14 Cells 15 Cells
VC15–VC14 CELL 9 CELL 10 CELL 11 CELL 12 CELL 13 CELL 14 CELL 15
VC14–VC13 short short short short short short CELL 14
VC13–VC12 short short short CELL 11 CELL 12 CELL 13 CELL 13
VC12–VC11 CELL 8 CELL 9 CELL 10 CELL 10 CELL 11 CELL 12 CELL 12
VC11–VC10b CELL 7 CELL 8 CELL 9 CELL 9 CELL 10 CELL 11 CELL 11
VC10–VC9 CELL 6 CELL 7 CELL 8 CELL 8 CELL 9 CELL 10 CELL 10
VC9–VC8 short short short short short CELL 9 CELL 9
VC8–VC7 short short CELL 7 CELL 7 CELL 8 CELL 8 CELL 8
VC7–VC6 CELL 5 CELL 6 CELL 6 CELL 6 CELL 7 CELL 7 CELL 7
VC6–VC5b CELL 4 CELL 5 CELL 5 CELL 5 CELL 6 CELL 6 CELL 6
VC5–VC4 CELL 3 CELL 4 CELL 4 CELL 4 CELL 5 CELL 5 CELL 5
VC4–VC3 short short short short CELL 4 CELL 4 CELL 4
VC3–VC2 short CELL 3 CELL 3 CELL 3 CELL 3 CELL 3 CELL 3
VC2–VC1 CELL 2 CELL 2 CELL 2 CELL 2 CELL 2 CELL 2 CELL 2
VC1–VC0 CELL 1 CELL 1 CELL 1 CELL 1 CELL 1 CELL 1 CELL 1
8.2 Typical Applications
CAUTION
The external circuitries in the following schematics show minimum requirements
to ensure device robustness during cell connection to the PCB and normal
operation.
Figure 8-1. bq76920 with bq78350 Companion Controller IC
Rc
Rc
Rc
Rc
Rsns
Cc
Cc
Cc
Cc
Cc
100
0.1 µF
4.7 µF
VC5x
VC5
VC4
VC3
VC2
VC1
VSS
SCL
SDA
CHG
DSG
REGSRC
REGOUT
SRN
SRP
VC0
CAP1
TS1 Cf
100
0.1 µF
1µF
Rc
1M1M
Rc
10k
ALERT
1M
PUSH-BUTTON FOR BOOT
VCC
GPIO
SDA
SCL
VSS
Cc
1µF
0.1 µF
10 kΩ
PACK +
PACK -
VC10
VC9
VC8
VC7
VC6
VC5b
Rc
Rc
Rc
Rc
Cc
Cc
Cc
Cc
Cc
Rc
Rc
Cc
BAT
CAP2
TS2 Cf
Rf
1 µF
10k
Rf
A
A
NC
NC
VC5x
Companion
Controller
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Figure 8-2. bq76930 With bq78350 Companion Controller IC
Rc
Rc
Rc
Rc
Rsns
Cc
Cc
Cc
Cc
Cc
100
0.1 µF
4.7 µF
VC5x
VC5
VC4
VC3
VC2
VC1
VSS
SCL
SDA
CHG
DSG
REGSRC
REGOUT
SRN
SRP
VC0
CAP1
TS1 Cf
100
0.1 µF
1 µF
Rc
1M1M
Rc
10k
ALERT
1M
PUSH-BUTTON FOR BOOT
VCC
GPIO
SDA
SCL
VSS
Cc
1 µF
0.1 µF
10 kΩ
PACK +
PACK
VC10
VC9
VC8
VC7
VC6
VC5b
Rc
Rc
Rc
Rc
Cc
Cc
Cc
Cc
Cc
Rc
Rc
Cc
VC10x
CAP2
TS2 Cf
Rf
1 µF
10k
Rf
A
A
VC15
VC14
VC13
VC12
VC11
VC10b
Rc
Rc
Rc
Rc
Cc
Cc
Cc
Cc
Cc
Rc
Rc
Cc
B
BAT
CAP3
TS3 Cf
1 µF
10k
Rf
B
NC
NC
NC
NC
VC5x
VC
10
x
Companion
Controller
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Figure 8-3. bq76940 with bq78350 Companion Controller IC
8.2.1 Design Requirements
Table 8-4. bq769x0 Design Requirements
DESIGN PARAMETER EXAMPLE VALUE at TA = 25°C
Minimum system operating voltage 24 V
Cell minimum operating voltage 3.0 V
Series Cell Count 8
Charge Voltage 33.6 V
Maximum Charge Current 3.0 A
Peak Discharge Current 10.0 A
OV Protection Threshold 4.30 V
OV Protection Delay 2s
UV Protection Threshold 2.5 V
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Table 8-4. bq769x0 Design Requirements (continued)
DESIGN PARAMETER EXAMPLE VALUE at TA = 25°C
UV Protection Delay 4s
OCD Protection Threshold Max 15 A
OCD Protection Delay Time 320 ms
SCD Protection Threshold Max 25 A
SCD Protection Delay Time 100 µs
8.2.2 Detailed Design Procedure
To begin the design process, there are some key steps required for component selection and protection
configuration.
8.2.2.1 Step-by-Step Design Procedure
Determine the number of series cells.
This value depends on the cell chemistry and the load requirements of the system. For example, to
support a minimum battery voltage of 24 V using Li-CO2 type cells with a cell minimum voltage of
3.0 V, there needs to be at least 8-series cells.
Select the correct bq769x0 device.
For 8-series cells, the bq76930 is needed.
For the correct cell connections, see Table 8-2.
Select the correct protection FETs.
The bq76930 uses a low-side drive suitable for N-CH FETs.
These FETs should be rated for the maximum:
Voltage, which should be approximately 5 V (DC) 10 V (peak) per series cell: for example, 40 V.
Current, which should be calculated based on both the maximum DC current and the maximum
transient current with some margin: for example, 30 A.
Power Dissipation, which can be a factor of the RDS(ON) rating of the FET, the FET package,
and the PCB design: for example, 5 W, assuming 5 mΩRDS(ON).
Select the correct sense resistor.
The resistance value should be selected to maximize the input bandwidth use of the coulomb
counter range, CCRANGE, but not exceed the absolute maximum ratings.
Using the normal max discharge current, RSNS = 200 mV / 10.0 A = 20 mΩ.
However, considering ISCD of 25 A and Abs Max SRP–SRN input of –300 mV, RSNS = 300 mV
/25A=7.5mΩ
The maximum operating current of the system should also be considered as this should be
below the maximum OCD Threshold, which with a RSNS of 7.5 mΩgives a max OCD current
setting of 13.3 A.
Further tolerance analysis (value tolerance, temperature variation, and so on) and PCB design
margin should also be considered, so RSNS of 5 mΩwould be suitable with a 75-ppm temperature
coefficient and power rating of 5 W.
The bq76930 is chosen, and so the REGSRC pin needs to be powered through a source follower
circuit where the FET is used to provide current for REGSRC from the battery positive terminal while
reducing the voltage to a suitable value for the IC.
The FET also dissipates the power resulting from the load current and dropped voltage external to
the IC and care should be taken to ensure the correct dissipation ratings are specified by the
chosen FET.
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Configure the Current-based protection settings through PROTECT1 and PROTECT2:
Ideal SCD Threshold = 25 A × 5 mΩ= 125 mV.
However, the closest options are 111 mV (0x03) and 133 mV (0x04) providing 22.2 A and 26.6
A, respectively. Both options have the RSNS bit = 1.
0x03 (22.2 A) will be used in this example.
The SCD delay threshold setting for a 100 µs delay is 0x01.
Therefore, PROTECT1 should be programmed with 0x8C.
Ideal OCD Threshold = 15 A × 5 mΩ= 75 mV.
However, the closest options are 72 mV (0x0A) and 78 mV (0x0B), providing 14.4 A and 15.6 A,
respectively. Both options have the RSNS bit = 1.
0x0A (14,4A) will be used in this example.
The OCD delay threshold setting for a 320-ms delay is 0x05.
Therefore, PROTECT2 should be programmed with 0x5B.
NOTE
Care should be taken when determining the setting of OV_TRIP and UV_TRIP as these are
ADC value outputs and correlation to cell voltage also requires consideration of the ADC
GAIN and ADC OFFSET registers. More specific details can be found in Section 7.3.1.2.
Configure the Voltage-based protection settings through OV_TRIP, UV_TRIP and PROTECT3:
The selected OV Threshold is 4.30 V.
Therefore, OV_TRIP should be programmed with 0xC9.
The selected UV Threshold is 2.5 V.
Therefore, UV_TRIP should be programmed with 0x1A.
The selected OV Delay is 2 s and the selected UV Delay is 4 s.
Therefore, PROTECT3 should be programmed with 0x50.
±1.6
±1.4
±1.2
±1.0
±0.8
±0.6
±0.4
±0.2
0.0
±40 ±15 10 35 60 85
Offset (uV)
Temperature (ƒC)
C002
±0.004
±0.002
0.000
0.002
0.004
0.006
0.008
0.010
0.012
0.014
0.016
0.018
0.020
2.00 2.30 2.60 2.90 3.20 3.50 3.80 4.10 4.40 4.70 5.00
VCx Error (mV)
VCx Input (V)
VC1 Error
VC2 Error
VC3 Error
VC4 Error
VC5 Error
C001
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8.2.3 Application Curves
Figure 8-4. bq76930 VCx Error Across Input Range at 25°C Figure 8-5. Coulomb Counter Offset
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9 Power Supply Recommendations
The bq769x0 devices are powered through the BAT and REGSRC pins but the bq76930 and bq76940
have additional ‘Power’ pins to provide the power to the entire device in the higher cell configurations.
The use of Rf and Cf connected to the BAT pin, noted in the typical application diagrams, are required to
filter system transients from disturbing the device power supply. These components should be placed as
close as to the IC as possible.
Additionally, for the bq76930 and bq76940 there are additional requirements to ensure a stable power
supply to the device. The REGSRC pin is powered through a source follower circuit where the FET is
used to provide current for REGSRC from the battery positive terminal while reducing the voltage to a
suitable value for the IC. The FET also dissipates the power resulting from the load current and dropped
voltage external to the IC and care should be taken to ensure the correct dissipation ratings are specified
by the chosen FET.
The bq76920 does not use a FET because the battery voltage is within the REGSRC range.
High Current Ground Plane Available Area
Low Current Ground Plane Available Area
Ground
interconnect
BAT-
BAT+ PACK+
PACK-
Key components placed here
Protection FETs
Sense Resistor
Key components placed here
bq78350
bq76920/30/40
Measurement Filter
Resistors and Capacitors
RSNS CHGDSG
bq769x0
bq78350
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Layout Copyright © 2013–2016, Texas Instruments Incorporated
10 Layout
10.1 Layout Guidelines
It is strongly recommended for best measurement performance to keep high current signals from
interfering with the measurement system inputs and ground.
A second key recommendation is to ensure that the bq769x0 input filtering capacitors and power
capacitors are connected to a common ground with as little parasitic resistance between the connections
as possible.
10.2 Layout Example
Figure 10-1 shows a guideline of how to place key components compared to respective ground zones,
based on the bq76920, bq76930, and bq76940 EVMs.
Figure 10-1. System Component Placement Layout vs. Ground Zone Guide
CAUTION
Care should be taken when placing key power pin capacitors to minimize PCB
trace impedances. These impedances could result in device resets or other
unexpected operations when the device is at peak power consumption.
Although not shown in the diagrams, this caution also applies to the resistor
and capacitor network surrounding the current sense resistor.
bq76920
REGSRC
REGOUT
BATTERY–
SENSE
RESISTOR
VSS
PCB Trace impedance
VC0
VC1
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LayoutCopyright © 2013–2016, Texas Instruments Incorporated
Figure 10-2.
Good Layout: Input Capacitor Grounding With Low Parasitic PCB Impedance
bq76920
BATTERY–
SENSE
RESISTOR
VSS
PCB Trace impedance
REGSRC
REGOUT
VC0
VC1
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Figure 10-3.
Weak Layout: Input Capacitor Grounding with High Parasitic PCB Impedance
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Mechanical, Packaging, and Orderable InformationCopyright © 2013–2016, Texas Instruments Incorporated
11 Device and Documentation Support
11.1 Documentation Support
11.1.1 Related Documentation
For related documentation, see the following: bq76920 Evaluation Module User 's Guide (SLVU924), and
bq76920, bq76930, bq76940 AFE FAQ (SLUUB41).
11.2 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 11-1. Related Links
PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL
DOCUMENTS TOOLS &
SOFTWARE SUPPORT &
COMMUNITY
bq76920 Click here Click here Click here Click here Click here
bq76930 Click here Click here Click here Click here Click here
bq76940 Click here Click here Click here Click here Click here
11.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the
respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views;
see TI's Terms of Use.
TI E2E™ Online Community The TI engineer-to-engineer (E2E) community was created to foster
collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge,
explore ideas and help solve problems with fellow engineers.
TI Embedded Processors Wiki Established to help developers get started with Embedded Processors
from Texas Instruments and to foster innovation and growth of general knowledge about the
hardware and software surrounding these devices.
11.4 Trademarks
E2E is a trademark of Texas Instruments.
I2C is a trademark of NXP B.V. Corporation.
All other trademarks are the property of their respective owners.
11.5 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
11.6 Glossary
TI Glossary This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the
most current data available for the designated devices. This data is subject to change without notice and
revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
PACKAGE OPTION ADDENDUM
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Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
BQ7692000PW ACTIVE TSSOP PW 20 70 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7692000
BQ7692000PWR ACTIVE TSSOP PW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7692000
BQ7692003PW ACTIVE TSSOP PW 20 70 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7692003
BQ7692003PWR ACTIVE TSSOP PW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 85 BQ7692003
BQ7692006PW ACTIVE TSSOP PW 20 70 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7692006
BQ7692006PWR ACTIVE TSSOP PW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7692006
BQ7693000DBT ACTIVE TSSOP DBT 30 60 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693000
BQ7693000DBTR ACTIVE TSSOP DBT 30 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693000
BQ7693001DBT ACTIVE TSSOP DBT 30 60 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693001
BQ7693001DBTR ACTIVE TSSOP DBT 30 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693001
BQ7693002DBT ACTIVE TSSOP DBT 30 60 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693002
BQ7693002DBTR ACTIVE TSSOP DBT 30 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693002
BQ7693003DBT ACTIVE TSSOP DBT 30 60 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693003
BQ7693003DBTR ACTIVE TSSOP DBT 30 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693003
BQ7693006DBT ACTIVE TSSOP DBT 30 60 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693006
BQ7693006DBTR ACTIVE TSSOP DBT 30 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693006
BQ7693007DBT ACTIVE TSSOP DBT 30 60 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693007
PACKAGE OPTION ADDENDUM
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Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
BQ7693007DBTR ACTIVE TSSOP DBT 30 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7693007
BQ7694000DBT ACTIVE TSSOP DBT 44 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694000
BQ7694000DBTR ACTIVE TSSOP DBT 44 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694000
BQ7694001DBT ACTIVE TSSOP DBT 44 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694001
BQ7694001DBTR ACTIVE TSSOP DBT 44 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694001
BQ7694002DBT ACTIVE TSSOP DBT 44 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694002
BQ7694002DBTR ACTIVE TSSOP DBT 44 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694002
BQ7694003DBT ACTIVE TSSOP DBT 44 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694003
BQ7694003DBTR ACTIVE TSSOP DBT 44 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694003
BQ7694006DBT ACTIVE TSSOP DBT 44 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694006
BQ7694006DBTR ACTIVE TSSOP DBT 44 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 BQ7694006
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
PACKAGE OPTION ADDENDUM
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Addendum-Page 3
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
BQ7692000PWR TSSOP PW 20 2000 330.0 16.4 6.95 7.1 1.6 8.0 16.0 Q1
BQ7692003PWR TSSOP PW 20 2000 330.0 16.4 6.95 7.1 1.6 8.0 16.0 Q1
BQ7692006PWR TSSOP PW 20 2000 330.0 16.4 6.95 7.1 1.6 8.0 16.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 11-Apr-2016
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
BQ7692000PWR TSSOP PW 20 2000 367.0 367.0 38.0
BQ7692003PWR TSSOP PW 20 2000 367.0 367.0 38.0
BQ7692006PWR TSSOP PW 20 2000 367.0 367.0 38.0
PACKAGE MATERIALS INFORMATION
www.ti.com 11-Apr-2016
Pack Materials-Page 2
www.ti.com
PACKAGE OUTLINE
C
42X 0.5
2X
10.5
44X 0.27
0.17
TYP
6.6
6.2
1.2 MAX
0.15
0.05
0.25
GAGE PLANE
-80
BNOTE 4
4.5
4.3
A
NOTE 3
11.1
10.9
0.75
0.50
(0.15) TYP
TSSOP - 1.2 mm max heightDBT0044A
SMALL OUTLINE PACKAGE
4220223/A 02/2017
1
22 23
44
0.08 C A B
PIN 1 INDEX
AREA
SEE DETAIL A
0.1 C
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not
exceed 0.15 mm per side.
4. This dimension does not include interlead flash. Interlead flash shall not exceed 0.25 mm per side.
SEATING
PLANE
A 20
DETAIL A
TYPICAL
SCALE 1.500
www.ti.com
EXAMPLE BOARD LAYOUT
0.05 MAX
ALL AROUND 0.05 MIN
ALL AROUND
44X (1.5)
44X (0.3)
42X (0.5)
(5.8)
(R0.05) TYP
TSSOP - 1.2 mm max heightDBT0044A
SMALL OUTLINE PACKAGE
4220223/A 02/2017
NOTES: (continued)
5. Publication IPC-7351 may have alternate designs.
6. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE: 8X
SYMM
SYMM
1
22 23
44
15.000
METAL
SOLDER MASK
OPENING METAL UNDER
SOLDER MASK SOLDER MASK
OPENING
EXPOSED METAL
EXPOSED METAL
SOLDER MASK DETAILS
NON-SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK
DEFINED
www.ti.com
EXAMPLE STENCIL DESIGN
44X (1.5)
44X (0.3)
42X (0.5)
(5.8)
(R0.05) TYP
TSSOP - 1.2 mm max heightDBT0044A
SMALL OUTLINE PACKAGE
4220223/A 02/2017
NOTES: (continued)
7. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
8. Board assembly site may have different recommendations for stencil design.
SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE: 8X
SYMM
SYMM
1
22 23
44
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