User's Guide
SLVU924C–March 2014–Revised July 2014
bq76920 Evaluation Module User's Guide
The bq76920EVM evaluation module (EVM) is a complete evaluation system for the bq76920, a 3-cell to
5-cell Li-Ion battery analog front end (AFE) integrated circuit. The EVM consists of a bq76920 circuit
module which is used for simple evaluation of the bq76920 AFE and bq78350 gauge functions. The circuit
module includes one bq76920 integrated circuit (IC), sense resistor, power FETs, and all other onboard
components necessary to protect the cells from overcharge, over discharge, short circuit, and overcurrent
discharge in a 5-series cell Li-Ion or Li-Polymer battery pack. The circuit module connects directly across
the cells in a battery. With a compatible interface board and Microsoft®Windows®based PC graphical
user interface (GUI) software, the user can view the device registers, adjust protection limits and enable
FET control outputs.
Contents
1 Features....................................................................................................................... 3
1.1 Kit Contents.......................................................................................................... 3
1.2 Ordering Information ............................................................................................... 3
1.3 bq76920 Circuit Module Performance Specification Summary............................................... 3
1.4 Required Equipment................................................................................................ 3
2 bq76920 EVM Quick Start Guide.......................................................................................... 4
2.1 Before You Begin................................................................................................... 4
2.2 Quick Start........................................................................................................... 4
3 Interface Adapter............................................................................................................. 7
4 bq76940/bq76930/bq76920 Software .................................................................................... 7
4.1 System Requirements.............................................................................................. 7
4.2 Installing the bq76940/bq76930/bq76920 Software ........................................................... 8
4.3 Interface Adapter.................................................................................................... 8
4.4 Software Operation................................................................................................. 8
5 Battery Management Studio Software................................................................................... 13
5.1 System Requirements ............................................................................................ 13
5.2 Installing bqStudio................................................................................................. 13
5.3 Interface Adapter SMB ........................................................................................... 13
5.4 bqStudio Operation ............................................................................................... 13
5.5 Firmware Programming........................................................................................... 15
5.6 Data Memory Configuration...................................................................................... 17
5.7 Chemistry View.................................................................................................... 18
5.8 Calibration ......................................................................................................... 19
5.9 Device Control..................................................................................................... 21
6 bq76920 Circuit Module Use.............................................................................................. 21
6.1 Cell Simulator...................................................................................................... 21
6.2 Evaluating with Simulated Current.............................................................................. 22
6.3 Reducing the Cell Count ......................................................................................... 22
6.4 Connecting Cells .................................................................................................. 23
6.5 Connecting to a Host ............................................................................................. 24
6.6 Gauge Circuits..................................................................................................... 24
6.7 Unused Components ............................................................................................. 24
7 bq76920EVM Circuit Module Physical Construction................................................................... 25
7.1 Board Layout....................................................................................................... 25
7.2 Bill of Materials .................................................................................................... 33
8 Related Documents From Texas Instruments.......................................................................... 39
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List of Figures
1 EVM Connection for Basic AFE Operation............................................................................... 5
2 EVM Connection for Basic Gauge Operation............................................................................ 7
3 bq76940/bq76930/bq76920 Evaluation Software Display.............................................................. 8
4 Registers View.............................................................................................................. 10
5 I2C Pro View................................................................................................................ 11
6 Sequence View............................................................................................................. 12
7 Target Selection Wizard................................................................................................... 14
8 bqStudio Window with Blank Gauge..................................................................................... 15
9 Firmware View.............................................................................................................. 16
10 Dashboard Adapter and Device Version Display ...................................................................... 16
11 Register View After Restart............................................................................................... 17
12 Data Memory Bit Field change ........................................................................................... 18
13 Chemistry View............................................................................................................. 19
14 Calibration View ............................................................................................................ 20
15 Example Voltage Calibration Successful................................................................................ 20
16 Advanced Comm SMB View ............................................................................................. 21
17 Simulating Current Setup.................................................................................................. 22
18 Top Silk Screen............................................................................................................. 25
19 Top Assembly............................................................................................................... 26
20 Top Layer.................................................................................................................... 27
21 Layer 2....................................................................................................................... 28
22 Layer 3....................................................................................................................... 29
23 Bottom Layer................................................................................................................ 30
24 Bottom Silk Screen......................................................................................................... 31
25 Bottom Assembly........................................................................................................... 32
26 Schematic Diagram AFE .................................................................................................. 36
27 Schematic Diagram Gauge .............................................................................................. 37
28 Schematic Diagram Cell Simulator ...................................................................................... 38
List of Tables
1 Ordering Information ........................................................................................................ 3
2 Performance Specification Summary ..................................................................................... 3
3 Reducing Cell Count....................................................................................................... 23
4 bq76920 Circuit Module Bill of Materials................................................................................ 33
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Features
1 Features
• Complete evaluation system for the bq76920 3-cell to 5-cell Li-Ion and Phosphate battery AFE
• Populated circuit module for 5-cell configuration for quick setup
• Power connections available on banana jacks
• Communication signals available on 4-pin connector
• Resistor cell simulator for quick setup with only a power supply
• PC software available for configuration
1.1 Kit Contents
• bq76920 circuit module
• Cable to connect the EVM to an EV2400 or EV2300 interface board
1.2 Ordering Information
For complete ordering information, refer to the product folder at www.ti.com.
Table 1. Ordering Information
EVM Part Number Chemistry Configuration Capacity
bq76920EVM Li-Ion 5 cells Any
NOTE: Although capacity is shown as Any, practical limits of the physical construction of the module
typically limits the operation of the EVM to a 1P or 2P battery construction. Refer to the
physical construction section for board details.
1.3 bq76920 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq76920 circuit module in its default 5-cell
series FET configuration.
Typical voltage depends on the number of cells configured. Typical current depends on the application.
Board cooling may be required for continuous operation at or below maximum current.
Table 2. Performance Specification Summary
Specification Min Typ Max Unit
Input voltage BATT+ with respect to BATT– 6 – 25 V
Continuous charge or discharge current 0 – 15 A
Operating temperature range 20 25 30 °C
1.4 Required Equipment
The following equipment is required to operate the bq76920 EVM in a simple demonstration:
• DC power supply, 0–25 V at 0.5 A for the AFE, 2.5 A for the gauge
• DC voltmeter
• TI EV2300 or EV2400 interface board
• Computer with USB port and compatible Windows operating system and access to the internet
• Test leads to connect equipment
• Electronic load or assorted resistors, calibrated load or load with accurate current meter required for
gauge evaluation
Additional equipment may be desired to operate the bq76920 with a more extensive demonstration.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
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bq76920 EVM Quick Start Guide
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2 bq76920 EVM Quick Start Guide
2.1 Before You Begin
The following warnings and cautions are noted for the safety of anyone using or working close to the
bq76920 EVM. Observe all safety precautions.
Warning The bq76920EVM circuit module may become hot during
operation due to dissipation of heat. Avoid contact with the
board. Follow all applicable safety procedures applicable to
your laboratory.
Caution Do not leave the EVM powered when unattended.
CAUTION
The circuit module has signal traces, components, and component leads on the
bottom of the board. This may result in exposed voltages, hot surfaces or sharp
edges. Do not reach under the board during operation.
CAUTION
The circuit module may be damaged by over temperature. To avoid damage,
monitor the temperature during evaluation and provide cooling, as needed, for
your system environment.
CAUTION
Some power supplies can be damaged by application of external voltages. If
using more than 1 power supply, check your equipment requirements and use
blocking diodes or other isolation techniques, as needed, to prevent damage to
your equipment.
CAUTION
The communication interface is not isolated on the EVM. Be sure no ground
potential exists between the computer and the EVM. Also be aware that the
computer is referenced to the Battery- potential of the EVM.
2.2 Quick Start
Determine if you wish to evaluate the AFE alone or with the gauge. For the AFE, proceed to Section 2.2.1.
For the gauge, skip to Section 2.2.2.
2.2.1 AFE Quick Start
These steps describe quick connection of the bq76920 EVM to demonstrate operation of the AFE portion
of the EVM. For more detailed descriptions, refer to other sections of the user guide.
Refer to Figure 1 for the following steps.
1. Download the bq76940/bq76930/bq76920 Evaluation Software from the tool folder link
www.ti.com/tool/bq76920EVM or search from www.ti.com.
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DC Power Supply
+ -
Boot
switch
EV2300/
EV2400 I2C
SMB
Pull-ups
for
EV2300
Remove
for
EV2400
Remove gauge
shunts
Cell simulator
switches on for
power supply
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bq76920 EVM Quick Start Guide
2. Install the bq76940/bq76930/bq76920 evaluation software (see Section 4). Install drivers for the
EV2300, if necessary.
3. Remove shunts from headers connecting the AFE to the gauge.
4. If the EV2300 is used, install shunts on the SCL and SDA pull-up headers. Remove any pull-up shunts
when using the EV2400.
5. Close all dip switch positions (default is closed).
6. Attach the interface board communication adapter to the PC using USB cable. The EV2400 is
recommended, the EV2300 works if it is available and drivers are installed.
7. Attach the interface board I2C connector to the EVM I2C connector using the 4-pin cable.
8. Connect a 0-V DC power supply capable of 250 mA minimum to the “BATT” terminals and adjust to
approximately 18 V.
9. Press and release the BOOT switch.
10. Start the bq769X0 evaluation software. The GUI should display. Click on the Scan box to enable
repeated update of the display. The power supply may be adjusted within range of the part to observe
voltage changes in the GUI display Stack V/T/I section.
11. Set the voltage to approximately 18 V or a mid-range operating level. Clear any faults present by
clicking on the Clear Faults button of the All Read/Write Registers section of the GUI.
12. Click on the Continuous button in the GUI Coulomb Counter section. Enable the CHG_ON and
DSG_ON bits by clicking on the bit and commit the changes. Apply a load to the PACK terminals. Load
current must be within the capability of the supply and the components installed or 15 A, whichever is
lower. Observe the Coulomb Counter value change in the GUI display Stack V/T/I section.
13. Make other adjustments as desired, for evaluation.
Refer to other sections of this user guide for additional details.
Figure 1. EVM Connection for Basic AFE Operation
2.2.2 Gauge Quick Start
These steps describe quick connection of the bq76920 EVM to demonstrate operation of the gauge
portion of the EVM. For more detailed descriptions, refer to other sections of the user guide. If you are
new to bqStudio software, you may wish to refer to the more detailed instructions for installing the
software in Section 5 before using the quick start.
Refer to Figure 2 for the following steps.
1. Download the Battery Management Studio (bqStudio) software from the bq78350 product folder link
www.ti.com/product/bq78350 or search from www.ti.com.
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2. Install the bqStudio software. Install drivers for the EV2300, if necessary.
3. Download the bq78350_xxxx.srec firmware file from the bq78350 product folder
www.ti.com/product/bq78350 and save it to a temporary location on your computer.
4. Install 4 shunts on the J12 header connecting the AFE to the gauge: GG_SCL, GG_SDA, GG_PWR
and GG_ALERT.
5. Install shunts on the SCL and SDA pull-up headers.
6. Install shunts on the /KEY, /PRES and 16/17 positions of the other headers.
7. Close all dip switch positions (default is closed).
8. Attach the interface board communication adapter to the PC using USB cable. The EV2400 is
recommended, the EV2300 works if it is available and drivers are installed.
9. Attach the interface board SMB connector to the EVM SMB connector using the 4-pin cable.
10. Remove any connection to the I2C connector. This connector must remain open for operation with the
gauge.
11. Connect a 0-V DC power supply capable of 2 A minimum to the “BATT” terminals and adjust to
approximately 15 (3V/cell) V.
12. Press and release the BOOT switch.
13. Start the bqStudio software. The bq78350 on the EVM is shipped blank, so the bqStudio will present a
Target Selection Wizard box. Select the latest version of the bq78350 from the list and select the
Finish button. Acknowledge the Proceed and the Battery Management Studio Timeout windows. The
GUI should display.
14. Click on the Firmware button at the top of the window to select the firmware view. Click on the
Browse button right of the program window, navigate to the .srec file you stored and select the file.
Click on the Program button. Wait for the programming status window to close, typically about 45 s.
15. Restart the bqStudio software so it can autodetect the device.
16. In the registers view, select the Refresh button and observe that there are 3 cell voltages.
17. Change the cell count to the number of cells supported by the board: Select the Data Memory view,
then the Settings button and the AFE Cell Map register. Change the value to 0x001F and click on the
Write to Data Memory button. Read data memory if desired to confirm the new value.
18. Send a Reset command using the Commands view or the from the Advanced Comm SMB view.
19. Select the Registers view and Refresh the values. Observe that all supported cells now show a
voltage reading.
20. Send the FET_EN command using the Commands view or the from the Advanced Comm SMB view.
21. Select the Registers view and Refresh the values. Observe that the FET_EN bit is now set and that
the CHG and DSG FET status is shown enabled.
22. Select the Calibration bq78350 view.
23. Enter the board temperature in the Temperature Sensor boxes and click on the Calibrate
Temperature button. Wait until a check box appears next to the button.
24. Measure the voltage of the BATT terminals. Divide the value by the number of cells and enter the
value in mV in the Ext Average Cell Voltage box. Click on the Calibrate Voltage button. Wait until a
check box appears next to the button.
25. Disconnect the load from the PACK terminals. Click on the Calibrate CC Offset button and wait until
the check mark appears next to the button.
26. Connect the load set to a known value of approximately 2 A to the PACK terminals. Enter the value in
mA into the Applied Current box. Discharge current should be entered as a negative value. Click on
the Calibrate Current button and wiat until the check mark appears next to the button.
27. Select the Registers view and Refresh the values. Observe the updated voltage, temperature and
current values.
The EVM is functioning and ready for further configuration for evaluation. Refer to the TRM or other
documents for the bq78350, and the other sections of this user guide for additional information.
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DC Power Supply
+ -
Boot
Switch
Pull-ups
Required
Install Gauge Shunts
Cell Simulator
Switches on for
Power Supply
Electronic Load
+ -
EV2300/
EV2400 I2C
SMB
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Interface Adapter
Figure 2. EVM Connection for Basic Gauge Operation
3 Interface Adapter
The bq76940/bq76930/bq76920 evaluation software and bqStudio software support either the TI EV2300
or EV2400 interface board to provide communication with the EVM board from the computer. Drivers must
be installed for the EV2300. The EV2400 uses operating system drivers and no separate installation is
required. Do not connect the EV2300 interface board to the computer until after the drivers are installed.
If you have used an EV2300 with your computer previously, no additional installation is required. EV2300
drivers are included in the bq76940 software installation package and are found in the installation directory
after installing the software, typically at c:\Program Files (x86)\Texas Instruments\bq76940. Alternatively or
for the bqStudio software, drivers are found at
http://e2e.ti.com/support/power_management/battery_management/m/videos__files/458983.aspx or
http://www.ti.com/tool/ev2300. Install the drivers by following these steps:
1. Navigate to the directory with the drivers.
2. Run the file EV2300....exe file
4 bq76940/bq76930/bq76920 Software
This section describes how to install and use the bq76940/bq76930/bq76920 software for the EVM. This
software is used when evaluating the AFE alone without the gauge. For evaluation with the bq78350
gauge, refer to Section 5.
The bq76940/bq76930/bq76920 software supports the bq76920 AFE I2C communication. This software is
intended to demonstrate register control and operation of the bq769x0 family of AFEs in the absence of a
gauge or MCU. This software is not intended to operate on a bus with another master. The AFE does not
turn on the protection FETs without control, the bq76940/bq76930/bq76920 software provides that control
from the GUI.
The software may also be identified as bq76940 or bq769X0 in menus or windows as space permits.
4.1 System Requirements
The bq76940/bq76930/bq76920 software requires a Windows 7, or later operating system. The computer
must also have Microsoft®.NET connection software version 4.0, or higher, installed. The examples in this
document are from Windows 7.
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4.2 Installing the bq76940/bq76930/bq76920 Software
Find the latest software version in the software section of the EVM tool folder
http://www.ti.com/tool/bq76920EVM or search from power.ti.com. Check periodically for software updates.
Use the following steps to install the bq76940/bq76930/bq76920 software:
1. Copy the archive file to a directory of your choice, extract all files and run the setup.exe application.
2. Follow the instructions and make selections as required on the setup windows selecting Next, as
required. TI recommends installing the software in the default location.
3. On the last window, select Close to complete the bq76940/bq76930/bq76920 software installation.
4.3 Interface Adapter
The interface adapter I2C connector should be connected to the I2C connector for use with the bq76940
software. Board pull-up shunts must be installed for the EV2300 and removed for the EV2400. The
interface adapter should not be connected to the I2C connector if a gauge or MCU is connected to the
bus.
4.4 Software Operation
This section describes connection of the communication interface to the EVM and operation of the
software.
Although the software runs without connection to a powered device, it is recommended to have the device
on when starting the software. Follow the directions in the quick start section. Figure 1 shows connections
for operation with the GUI software.
Start the software from the desktop shortcut bq769X0 Evaluation Software or the menu Start →All
Programs →Texas Instruments →bq769X0 Eval Software.
When started, the software looks for the communication interface and the device. If either is not found, a
popup window appears and must be acknowledged. When communication is established with the device,
the main window appears as shown in Figure 3.
The bq76940/bq76930/bq76920 software uses popup help tips on many of the control features.
Figure 3. bq76940/bq76930/bq76920 Evaluation Software Display
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The software window contains a menu bar and 3 sections. The top section is an I2C tool. The middle
section has 3 selectable views. The bottom section is a status section. Details are described in following
sections.
4.4.1 Status Section
The bottom section displays the software name and version, the CRC mode and the communication
status. The CRC mode is automatically detected and the software communicates to the IC appropriately.
To the right of the CRC mode is a communication status area which may display information about the
communication with the device. Common displays and actions may include the following:
•Data channel name is invalid. Check the USB connection to the interface board. Exit and restart the
software
•No acknowledge from device. Check that the 4 pin cable is connected, the EVM is powered and boot
the device, then try to read the device.
•CRC read from device does not match calculated CRC. Check that the Read Device button was used
to detect the device. Check the connection of the 4 pin cable or its routing near high noise sources.
•Not able to find a free communication adapter. Check the connection of the USB cable to the
communication adapter.
•USB adapter timeout. Unplug and re-connect the USB cable and try to read from the device again.
• When the status area is blank, the last communication with the device was successful
4.4.2 I2C Section
The top section of the window below the menu bar has the I2C address and a byte communication tool.
The I2C address must be entered, the tool does not automatically detect the address. The default address
is 0x08 which is the default address for the device on the EVM. If the AFE on the EVM has been changed
to a different address, the address must be entered. The value is the 7 bit address and is shifted left 1 bit
position when observed on the bus.
The byte communication tool is useful to read or write a register. It is present with all views.
4.4.3 Menu Commands
The Help > About menu selection displays version information about the program. Other selections may
provide additional help or links to documentation.
The Options > Verify Writes selection allows selection of a readback of the registers once they are written.
The View menu allows selection of the center window display. Options are the Registers, I2C Pro or
Sequence views. Views can also be selected with buttons on the left side of the window.
Exit the program with the File menu.
4.4.4 Registers View
The registers view is the default display in the middle of the window when the software is started, see
Figure 4. It shows the control register values. If another view is displayed it is selected using the
Registers button on the left side of the window or from the menu.
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Figure 4. Registers View
The Read Device button at the top of the Registers view provides important setup of the
bq76940/bq76930/bq76920 software and the IC. The software reads the factory gain and offset data from
the device and populates these in the Stack V/T/I section for use in calculating display values. The
software writes the CC_CFG register to its proper value and also detects the CRC mode of the device and
sets the software appropriately.
The control registers are shown in the center of the display in the All Read/Write Registers section. Bits
are color coded as described in the section. Bits may be changed by clicking on the bit and selecting
Commit button in the Change value pop-up window. The default for the pop up window is to change the
polarity of the bit. Since clearing status bits requires a write of 1, the Set bit high needs to be checked in
the Change value pop-up window when clearing status register bits. A bit value change is displayed if the
Options menu Verify Writes is selected.
Control registers can also be changed as register values by writing in the value box to the right of the
value box. Scan must be disabled to enter values. Register values may also be changed using the I2C
byte write tool at the top of the window. Register changes are visible if the Verify Writes option is enabled.
The display may also be updated using the Update Display button or selecting Scan.
The All Read/Write Registers section contains 4 buttons to the right of the register display:
•Update Display: This button reads all control and value registers and updates the values, bit breakout
fields and control features.
•Clear Faults: This button clears the status register.
•Save Configuration: This button allows saving the displayed values of the control register to a file. A
pop-up box allows selection of the file name. The default file location is C:\Users\<account-
name>\Documents\Texas Instruments\bq76940.
•Load configuration: This button allows loading the control register values from a file. A pop-up box
allows selection of the file, another pop up box lets you select whether to write the values to the
device. If faults are not set in the status register value in the file, they are not cleared by the write.
The Base Configuration section shown above the register detail provides convenient control of the
Coulomb Counter, ADC and Temperature Sensor selection as functional controls without locating the
control bits.
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The Data Scanning section allows periodic read of the device and display of the register values. The Scan
check box enables the read when checked. The update interval is displayed and can be changed with the
Change Interval button.
The Logging section has the Start Logging button. The values read from the device can be saved to a
file. Selecting the Start Logging button opens a bq76940 Logging popup window to enter the file name,
comments and to select the data groups to be logged. The file name must be entered with the pop up
window's Browse button. The scan interval can be changed, and the logging is actually started in the pop
up window. When logging is active, the registers user interface cannot be used and the button changes to
Stop Logging. Selecting the button stops the logging. Scan is not necessary before logging, it will start
with logging and cannot be disabled during logging.
The Stack V/T/I section is on the right side of the Registers view (Figure 4). The ADC Gain and Offset
boxes show the values that are used for converting the register data into values. These value boxes are
read only, they are updated by the values read from the device with the Read Device button. The Display
raw data read from device below check box allows display of the hex register values rather than converted
values. The V/T/I values are updated by the Read Device button, the Update Display button, or the Scan
option.
4.4.5 I2C Pro View
Figure 5 shows the I2C Pro view of the GUI. The I2C Pro view is useful to read or write several sequential
registers. If another view is displayed, it can be selected using the I2C PRO button on the left side of the
window or from the menu. The I2C Command box for each section specifies the starting register address
for the transaction.
Figure 5. I2C Pro View
4.4.6 Sequence View
Figure 6 illustrates the Sequence view of the GUI. This is useful to send timed sequences of register
reads or writes to the device. It can be selected using the SEQUENCE button on the left side of the
window or from the menu. A sequence is run by selecting its Execute button. The results of the sequence
are shown in the Sequence Dialog section. Edit the sequence by selecting the file name under the
sequence name in the window.
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Figure 6. Sequence View
The installation comes with 3 sequence files. The Clear Faults files contain descriptions for requirements
for a sequence file. The Set UV Trip... file shows an example of a simpler format. Sequence files are
installed to: C:\Users\<account-name>\Documents\Texas Instruments\bq76940\sequence. Sequences are
loaded from this location when the program starts. Create new sequences with a text editor and save
them with the .bqseq extension. Up to 8 sequences can be stored, move other sequences to another
directory or change the extension. The sequences Sequence_Example.bqseq,Sequence Clear
Faults.bqseq, and UVTrip.bqseq are required, do not move them from the directory.
Typical uses of a sequence might include:
• Reading and clearing faults, then enabling CHG and DSG outputs
• Setting ship mode
• Setting a balance pattern
• Any repetitive multiple-register write used in evaluation
While sequences can be executed during logging, the logging is paused while the sequence executes.
Long sequences leave gaps in the log data.
4.4.7 Typical Operation of Software
Typical operation of the software involves the following steps, much like described in quick start section:
• Connect the EVM and related equipment
• Power the EVM
• Boot the EVM
• Start the software
• Read and change registers, as desired
If the board is powered off during the evaluation process:
• Power the EVM
• Boot the EVM
• Select the Read Device button
• Read and change registers, as desired
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Battery Management Studio Software
If the interface board is connected to a system already in operation and the software has not been exited:
• Select the Read Device button
• Read and change registers, as desired
4.4.8 Operation with Other Interfaces or Hosts
The bq76940/bq76930/bq76920 software does not support other interface boards or adapters other than
the EV2300 and EV2400. The software does not operate in a multi-master environment. If operated with
another host on the line, data collisions can occur. Also be aware that the EV2400 has internal pull-up
resistors to 3.3 V, connecting to some shared busses could damage devices on that bus if the bus voltage
differs.
5 Battery Management Studio Software
The Battery Management Studio software is used for evaluation of the bq78350 gauge. It is also identified
as bqStudio for a compact name. If an earlier version of the bqStudio software is already installed from
another product evaluation, it should still be installed again to load the configuration files and tools specific
to the current version of the bq78350.
5.1 System Requirements
The bqStudio software requires a Windows 7, or later, operating system. Additional items are required and
are described in the installation windows. The examples in this document are from Windows 7.
5.2 Installing bqStudio
Find the latest software version in the software section of the product folder
http://www.ti.com/product/bq78350 or search from power.ti.com. Check periodically for software updates.
Use the following steps to install the bqStudio software:
1. Copy the archive file to a directory of your choice, extract all files and run the Battery Management
Studio-xxxxxx-Setup.exe application.
2. Follow the instructions and make selections as required on the setup windows selecting Next, as
required. TI recommends installing the software in the default location.
3. On the last window, select Finish to complete the bqStudio software installation.
5.3 Interface Adapter SMB
The interface adapter SMB connector must be connected to the SMB connector of the EVM for use with
the bqStudio software. Pull-ups for the SMBus are provided inside the adapter. The interface adapter
should not be connected to the I2C connector of the EVM.
5.4 bqStudio Operation
bqStudio is used to communicate to the bq78350 gauge for evaluation. It includes a number of tools to aid
in configuration of the bq78350 for evaluation. bqStudio will not communicate with the AFE and the I2C
connector of the EVM should not be connected while using bqStudio.
Although the software runs without connection to an interface board or powered device, it is
recommended to have both connected and the device on when starting the software. Follow the directions
in the gauge quick start section. Figure 2 shows connections for operation with the bqStudio software.
Start the software from the desktop shortcut Battery Management Studio or the menu Start →All
Programs →Texas Instruments →Battery Management Studio.
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When started, the software looks for the communication interface and the device. If the device is not
found, it opens a Target Selection Wizard. This is expected for a new EVM since the bq78350 is not
programmed. Select the newest bq78350 version in the list and click the Finish button. This selection will
be remembered until the software is re-stared. If the device is not found, the user will be presented with a
Proceed? window which must be acknowledged. If the software still can not find the device, a Battery
Management Studio popup window appears indicating communication status. With a blank or un-powered
part, this will indicate a timeout. Acknowledge the message to proceed.
Figure 7. Target Selection Wizard
If the software was started without a communication interface adapter, a Battery Management Studio
popup window will indicate a free adapter is not available. Acknowledge the message to proceed. Errors
will appear in the left bottom border of the Battery Management Studio screen. Correct the problem with
the adapter and restart the software.
When the software is first started in a new installation, a welcome view covers the main portion of the
window. This offers an overview or tutorials of the software. After reviewing any desired content, close the
welcome view. If it is desired to see this again, the welcome view can be opened from the menu selection
Help | Welcome.
bqStudio contains a user guide for general operation of the software. Refer to the menu selection Help |
Help Contents for information.
Once the welcome view is closed, the bqStudio window appears as shown in Figure 8. The register area
is blank since communication with the blank device on the EVM does not provide data.
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Figure 8. bqStudio Window with Blank Gauge
5.5 Firmware Programming
Firmware must be programmed to the bq78350 mounted to the EVM before operation. Firmware is
programmed using the Firmware view. Click on the Browse button and select the file to be programmed.
Using the Execute after programming feature is recommended. Click on the Program button to start
programming. A Progress Information window will display during programming and will close when
complete. Programming typically takes about 40 s.
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Figure 9. Firmware View
After programming, restart the bqStudio software so that it will autodetect the new firmware and load the
proper configuration for the tools. After start with autodetection, the dashboard display should show the
version read from the device rather than a version input from the Target Selection Wizard. An example of
the dashboard display is shown in Figure 10. If the version read by the autodetect is the same as the
version previously selected in the Target Selection Wizard, no change may be apparent, but restarting to
allow tool configuration is still recommended.
Figure 10. Dashboard Adapter and Device Version Display
The default configuration of the firmware is for 3 cells. An example of the register view after restart is
shown in Figure 11. Note that 3 cell voltages are present. The device must be configured for operation
with other cell counts, this includes basic operation of the EVM.
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Figure 11. Register View After Restart
5.6 Data Memory Configuration
Most of the configuration of the bq78350 is accomplished through setting values in data memory. The data
memory is accessed using the Data Memory view. Configuration values are orgainized in functional
groups selected by buttons on the left side of the view. Data values may be changed by selecting and
entering a value. Parameter registers which are bit fields may be changed by selecting the bit in the pop
up when the register or its value is selected. Figure 12 shows the bit field for the AFE Cell Map which is
one of the most basic settings that must typically be changed with the EVM. The AFE Cell Map is a
physical location of the cells. Refer to the bq78350 TRM (SLUUAN7) for information on this and other
configuration parameters. Data Memory must be written after change. See other technical documents in
the bq78350 product folder www.ti.com/product/bq78350,
The Export tool in the Data Memory view allows saving the configuration data to a comma-separated-
value file format which can be accessed by a spreadsheet program. Reading data before export will save
the data from the part rather than values which may be only in the view. The Import tool allows loading
such a file into the view so that it can be written to the device.
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Figure 12. Data Memory Bit Field change
5.7 Chemistry View
The bq78350 uses the chemistry of the cells to estimate the state of charge of the pack after a reset.
Chemistry information is not loaded to the device as a Data Memory parameter but by using the Chemistry
view. Loading the chemistry is not required for simple operation of the EVM but will be desired for setup of
the board or a part for operation with cells, particularly if the chemistry differs from the default. The
chemistry view is shown in Figure 13.
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Figure 13. Chemistry View
5.8 Calibration
The EVM and all new boards should be calibrated before operation. The calibration view is shown in
Figure 14. Temperature is typically calibrated first. Current Offset should be calibrated with no current flow
and should be calibrated before Current Gain. The EVM uses a 1-mΩsense resistor and calibration at low
current will result in some granularity from the current resolution. This may result in an apparent error at
higher currents. Calibration at higher currents will reduce this effect and should be done where it is
important.
By default, the bq78350 uses the average cell voltage for gauging. This voltage must be calibrated.
Measure the battery voltage, calculate the average cell value and enter the value in the box. Clicking the
Calibrate Voltage button runs the calibration. Values left blank or entered as '0' are not calibrated. When
successful, a green check appears next to the button as shown in Figure 15. If there is an error, a red X
appears instead with a message. The bq769x0 contains factory voltage calibration data for cell voltage
values. The bq78350 uses this data to determine the individual cell voltage. When it is desired to calibrate
each cell's offset rather than relying on the average stored in the bq769x0, individual cell voltages can be
measured and calibrated. Cells can be calibrated in groups or individually by entering or clearing the
desired values.
Basic steps for calibration of the EVM is described in the quick start section. Since the EVM uses 1%
values for the cell simulator resistors, measuring each cell voltage value is recommended rather than
using a common value if individual cell voltage calibration is desired.
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5.9 Device Control
Features are controlled by commands as described in the bq78350 TRM (SLUUAN7). One of the most
basic for operation as described in the quick start section is the FET enable which is toggled by the
ManufacturerAccess() 0x0022 command. The Manufacturer Access commands may be sent using the
Advanced Comm SMB view and the Write Word button. An example is shown in Figure 16. A number of
the common commands are also available in buttons in the Commands view. Using the commands the
gauge may be controlled for test or setup for further evaluation. Refer to the bq78350 TRM for additional
information on the commands.
Figure 16. Advanced Comm SMB View
6 bq76920 Circuit Module Use
The bq76920 circuit module contains the bq76920 IC and related circuitry to demonstrate the features of
the IC. Surface mount FETs are provided for the high current path. A thermistor provides temperature
sensing on the board. Other components provide support for the IC and connections to the board. Basic
operation is described in the quick start guide. For details of the circuit, refer to the physical construction
section.
6.1 Cell Simulator
The EVM includes a resistive cell simulator made up of 200-Ωseries resistors. The top section of the S3
switch connects the BATT+ node to the top of the resistor string. The bottom of the resistor string is
connected to BATT–. The individual cell taps are connected to the cell monitor signals by other sections of
the dip switch. When operating with a power supply all switch sections should be closed. When operating
with cells, all the dip switch sections should be open to prevent loading the cells and discharging the
battery. The cell simulator resistors are located on the bottom of the board and may become warm during
operation. The orange LED near the dip switch indicates the cell simulator has power.
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DC Power Supply
+ -
EV2300/
EV2400 I2C
SMB
DC Power Supply
+ -
(Load)
bq76920 Circuit Module Use
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6.2 Evaluating with Simulated Current
The quick start guide describes connection for basic operation. Providing more than recognizable current
in that configuration can require a power supply with a significant power rating. Applying a charge current
can damage some power supplies. Figure 17 shows a method to force current through the control path
without a high wattage power supply or special equipment. The load power supply should be set at a low
voltage in a constant current mode. Polarity can be reversed on the load supply to simulate a charge
current. The battery simulation supply should never be reversed. The diagram shows communication
connection for AFE evaluation, the technique will also work for gauge evaluation with appropriate
communication connection.
Figure 17. Simulating Current Setup
The power supply technique can also be used with the bq78350 to provide current for calibration or to
show current flow. However the simulated current will not provide good gauging evaluation.
6.3 Reducing the Cell Count
Cell count can be reduced for basic evaluation by shorting unused cells at the input terminal block. Follow
the recommendations in the datasheet for which cells to short. This works for both operation with the cell
simulator and cells, but can have some side effects in transient tests because it parallels the shorted
resistors to the cell IC where the capacitor provides a signal path to the used input. For the best
evaluation with reduced cells in a transient environment, short the VCx pins at the capacitor or VCx test
points and remove the unused input resistor. When using the cell simulator, shorting the unused cell
resistor is still required to eliminate the simulated cell voltage. Shorting the cell inputs at the terminal block
screw terminals is suggested since it should be apparent if the board is re-used for a different cell count.
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Table 3. Reducing Cell Count
Unused Cell Short Cell Terminals Input Resistor to Remove Short AFE Inputs
(Numbered from Bottom Cell 1)
Cell 4 C4 to C3 R5 VC4 to VC3
Cell 3 C3 to C2 R6 VC3 to VC2
When evaluating the gauge, it is recommended to reduce the cell count of the gauge configuration before
connecting the cells. If the gauge does not see voltage it will shut down the AFE and require re-boot of the
board. To avoid shutdown simulate a charge current until the cell count configuration can be corrected.
6.4 Connecting Cells
The EVM is constructed to sense the cell voltages at the cells. Separate wires are required from the
bottom of the battery stack to the C0 connection at the terminal block for sensing voltage and from the
bottom of the battery stack to the BATT– terminal to carry the load current. The AFE IC VSS is referenced
to the BATT– connection. Similarly, separate wires are required from the top of the battery stack to the top
cell input of the terminal block and from the top of the battery stack to the BATT+ terminal to carry the
load current. The top cell sense connection also powers the AFE IC. To move the sense connections from
the cells to the board, populate R1 and R2. The bottom cell simulator switch can be closed to connect C0
to BATT–.
The cell simulator provides resistors between the cell inputs. These resistors can help divide the voltage
as cells are connected. If desired, the cell simulator switches can be closed during cell connection and
opened after cell connection. The switches must be opened after connection of cells or the cells will be
discharged by the constant drain of the cell simulator. If the orange LED is on when cells are connected,
open the dip switch sections to remove the load.
Cell connection is generally considered safest from the bottom up. This minimizes the step size of the
voltage applied to the board. Recommended connection sequence for the EVM when connecting wires
individually is bottom up:
1. Connect BATT–
2. Connect cells bottom up; C0, C1, C2 ...
3. Connect BATT+
4. Open the cell simulator switches, if needed
When the top and bottom cells are connected on the board:
1. Connect BATT– (includes C0)
2. Connect cells bottom up; C1, C2, C3...
3. Connect BATT+ (includes top cell)
4. Open the cell simulator switches, if needed
When cells are mated with a connector:
1. Connect BATT– or the node which connects VSS of the AFE, if separate
2. Mate the connector
3. Connect the BATT+. if separate
4. Open the cell simulator switches, if needed
When using external balancing with P-channel MOSFETs, such as on the bq76930 and bq76940 EVMs,
the inrush current for a cell can momentarily turn on the balance FET causing the next cell input below to
rise. This can continue down the stack. Connecting C0 on the board by closing the C0 dip switch during
cell connection can reduce stress on the VC0 input of the AFE. Open the switch after cell connection for
sensing at the cell.
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6.5 Connecting to a Host
After initial operation of the AFE with the bq76940/bq76930/bq76920 software, it may be desirable to
operate the board connected to a microcontroller board. J12 could be used to connect to the
microcontroller board. No voltages should be applied to the gauge terminals. Alternately, the
microcontroller is connected to the signal test points or J8 and the ALERT test point. The interface voltage
for the installed AFE IC is 2.5 V.
6.6 Gauge Circuits
The EVM contains a gauge circuit consisting of U2 and an SMBus interface connector, J14. This bq78350
IC and circuit can be used to control the AFE if configured and connected at the J12 header. By default
the AFE on the EVM is a 2.5V output device, only connect the gauge circuitry to a 2.5-V output AFE IC.
Shunts may be placed on the /KEY and /PRES headers to simulate control of these signals. An alternate
SMBus address may be selected using the SMBus header. Refer to the bq78350 TRM for details and
configuration selections for these device features.
6.7 Unused Components
The EVM contains a number of component patterns which may be useful for evaluation.
Test points are not typically populated. The patterns may be used as probe points or wires or test points
could be soldered to provide probing, if desired.
Normally the power filter R14 and C13 keeps the supply voltage for the AFE in a safe operating range. For
situations with large transients, D3 provides a clamp for the supply voltage to the AFE, if needed. The
pattern is large and it is easy to fit other component sizes. Be aware that if the system transients are large
enough that a clamp is needed at D3, the cell inputs should also be inspected for excessive voltages and
an improved filter or clamp be added there, if needed.
The ALERT line switches high and low in normal operation as status bits are asserted and cleared. A
large load is not desired since it consumes power. If it is useful to slow the transition, the pattern C10 is
available. C10 should not be large in order to avoid current and slowing the edge to where the bq76920
would see the ALERT high as an input and set the OVRD_ALERT condition.
When the charge FET turns on with a large charger voltage present, a large voltage could be impressed
on the gate of the charge FET. With the voltages typically used on the bq76920EVM, this should not be
high enough to damage the charge FET. If special circumstances require, the D5 pattern is available for a
clamp diode.
D6 is a flyback diode to prevent PACK- from rising significantly above PACK+. The D7 pattern provides a
place to mount a higher current diode or other transient suppression component.
HS1 is a position to mount a suitable heatsink, if needed. Other heatsink options may be available in the
evaluation environment.
R34 and R35 provide options to pull down unused signals. Connect as recommended in the datasheet for
the bq78350 used.
J11, C19, R28, R29, R33, R40, R41, R42, and R56 provide component patterns to optinally bring signals
to a convenient location for evaluating the behavior of the bq78350 with a high side switch configuration.
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bq76920EVM Circuit Module Physical Construction
7 bq76920EVM Circuit Module Physical Construction
This section contains the PCB layout, bill of materials, and schematic of the bq76920EVM circuit module.
The bq76920EVM consists of one circuit module assembly, PWR523.
7.1 Board Layout
The bq76920EVM circuit module is a 4.0-inch × 4.805-inch 4-layer circuit card assembly. It is designed for
easy assembly with cell connections on the left side to a terminal block and high current terminals through
banana jacks. Control connections are on the left top. Pack terminals are on the right side using banana
jacks. Wide trace areas are used reducing voltage drops on the high current paths. The EVM layout and
construction allows easy understanding of the connections and access to the test points for evaluation, but
the connector area and programming features result in a large board.
See additional information in the configuration and operation sections of this document. Figure 18 to
Figure 25 show the board layout.
Figure 18. Top Silk Screen
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7.2 Bill of Materials
The bill of materials for the circuit module is shown in Table 4. Substitute parts may be used in the manufacturing of the assembly.
Table 4. bq76920 Circuit Module Bill of Materials
Designator Qty Value Description Package Reference Part Number MFG Alternate Alternate
Part Number MFG
PCB1 1 Printed Circuit Board PWR523 Any - -
C1, C2, C3, C4, C5, C6, C14 7 1uF CAP, CERM, 1uF, 16V, +/-10%, X7R, 0805 0805 GRM21BR71C105KA01L MuRata
C7, C8, C9, C11, C12, C17, C18, 10 0.1uF CAP, CERM, 0.1uF, 50V, +/-10%, X7R, 0603 0603 GCM188R71H104KA57B MuRata
C21, C22, C23
C13 1 2.2uF CAP, CERM, 2.2uF, 50V, +/-10%, X5R, 1206 1206 GRM31CR61H225KA88L MuRata
C15 1 4700pF CAP, CERM, 4700pF, 50V, +/-10%, X7R, 0805 0805 08055C472KAT2A AVX
C16 1 4.7uF CAP, CERM, 4.7uF, 10V, +/-10%, X7R, 0805 0805 GRM21BR71A475KA73L MuRata
C20 1 3300pF CAP, CERM, 3300pF, 25V, +/-10%, X7R, 0603 0603 GRM188R71E332KA01D MuRata
D1 1 28V Diode, TVS, Uni, 28V, 1500W, SMC SMC SMCJ28A Fairchild Semiconductor
D2, D4, D12 3 1.25V Diode, Ultrafast, 100V, 0.15A, SOD-123 SOD-123 1N4148W-7-F Diodes Inc.
D6 1 600V Diode, Ultrafast, 600V, 3A, SMC SMC MURS360T3G ON Semiconductor
D8, D9, D10, D11, D19, D20 6 5.6V Diode, Zener, 5.6V, 200mW, SOD-323 SOD-323 MMSZ5232BS-7-F Diodes Inc.
D13 1 16V Diode, Zener, 16V, 500mW, SOD-123 SOD-123 MMSZ5246B-7-F Diodes Inc.
D14, D15, D16, D17, D18 5 Green LED, Green, SMD 1.6x0.8x0.8mm LTST-C190GKT Lite-On
D21 1 Orange LED, Orange, SMD 1.6x0.8x0.8mm LTST-C190KFKT Lite-On
H1, H2, H5, H6 4 Machine Screw, Round, #4-40 x 1/4, Nylon, Philips panhead Screw NY PMS 440 0025 PH B&F Fastener Supply - -
H3, H4, H7, H8 4 Standoff, Hex, 0.5"L #4-40 Nylon Standoff 1902C Keystone - -
J1 1 Receptacle, 3.5mm 6x1, R/A, TH Header, 6x1 R/A 395021006 Molex
J2, J3, J6, J7 4 Standard Banana Jack, Uninsulated, 15A Banana Jack 108-0740-001 Emerson Network Power
J4, J5, J9, J10 4 Header, 100mil, 2x1, Tin plated, TH Header, 2 PIN, 100mil, Tin PEC02SAAN Sullins Connector Solutions
J8, J14 2 Header, 100mil, 4x1, R/A, TH 4x1 R/A Header 22-05-3041 Molex
J12 1 Header, 100mil, 5x2, Tin plated, TH Header, 5x2, 100mil, Tin PEC05DAAN Sullins Connector Solutions
J13 1 Header, 100mil, 3x1, Tin plated, TH Header, 3 PIN, 100mil, Tin PEC03SAAN Sullins Connector Solutions
P1 1 CONN TERM BLOCK 3.5MM 6POS R/A Term Block Plug 39500-0006 Molex - -
Q1, Q2 2 30V MOSFET, N-CH, 30V, 100A, SON 5x6mm SON 5x6mm CSD17501Q5A Texas Instruments None
Q3, Q4 2 -50V MOSFET, P-CH, -50V, -0.13A, SOT-323 SOT-323 BSS84W-7-F Diodes Inc. None
Q5, Q6, Q8 3 50V MOSFET, N-CH, 50V, 0.22A, SOT-23 SOT-23 BSS138 Fairchild Semiconductor None
Q7 1 0.25V Transistor, PNP, 40V, 0.2A, SOT-23 SOT-23 MMBT3906 Fairchild Semiconductor None None
Q9 1 0.5V Transistor, NPN, 80V, 1A, SOT-89 SOT-89 BCX5616TA Diodes Inc.
R3, R21, R23, R51, R55 5 10.0k RES, 10.0k ohm, 1%, 0.125W, 0805 0805 CRCW080510K0FKEA Vishay-Dale
R4, R5, R6, R7, R8, R9 6 100 RES, 100 ohm, 1%, 0.25W, 1206 1206 CRCW1206100RFKEA Vishay-Dale
R10, R12, R14, R24, R25, R26, R27, 15 100 RES, 100 ohm, 1%, 0.125W, 0805 0805 CRCW0805100RFKEA Vishay-Dale
R31, R32, R36, R37, R57, R58, R61,
R62
R11 1 0.001 RES, 0.001 ohm, 1%, 2W, 4527 4527 WSR21L000FEA Vishay-Dale
R13 1 499k RES, 499k ohm, 1%, 0.125W, 0805 0805 CRCW0805499KFKEA Vishay-Dale
R15, R18, R19, R47, R54, R59, R60 7 1.00Meg RES, 1.00Meg ohm, 1%, 0.125W, 0805 0805 CRCW08051M00FKEA Vishay-Dale
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Table 4. bq76920 Circuit Module Bill of Materials (continued)
Designator Qty Value Description Package Reference Part Number MFG Alternate Alternate
Part Number MFG
R16, R30 2 0 RES, 0 ohm, 5%, 0.125W, 0805 0805 CRCW08050000Z0EA Vishay-Dale
R17 1 1.00k RES, 1.00k ohm, 1%, 0.125W, 0805 0805 CRCW08051K00FKEA Vishay-Dale
R20 1 10.0k Thermistor NTC, 10.0k ohm, 1%, Disc, 5x8.4 mm Disc, 5x8.4 mm 103AT-2 SEMITEC Corporation
ohm
R22 1 3.01k RES, 3.01k ohm, 1%, 0.125W, 0805 0805 CRCW08053K01FKEA Vishay-Dale
R38 1 300k RES, 300k ohm, 0.1%, 0.1W, 0603 0603 RG1608P-304-B-T5 Susumu Co Ltd
R39, R43 2 13.7k RES, 13.7k ohm, 0.1%, 0.1W, 0603 0603 RG1608P-1372-B-T5 Susumu Co Ltd
R44, R45, R50, R52 4 100k RES, 100k ohm, 1%, 0.125W, 0805 0805 CRCW0805100KFKEA Vishay-Dale
R46 1 0 RES, 0 ohm, 5%, 0.25W, 1206 1206 CRCW12060000Z0EA Vishay-Dale
R48 1 1.0k RES, 1.0k ohm, 5%, 1W, 2512 2512 ERJ-1TYJ102U Panasonic
R49 1 196k RES, 196k ohm, 1%, 0.125W, 0805 0805 CRCW0805196KFKEA Vishay-Dale
R53 1 49.9k RES, 49.9k ohm, 1%, 0.125W, 0805 0805 CRCW080549K9FKEA Vishay-Dale
R63 1 221k RES, 221k ohm, 1%, 0.125W, 0805 0805 CRCW0805221KFKEA Vishay-Dale
R64, R65 2 1.00k RES, 1.00k ohm, 1%, 0.25W, 1206 1206 CRCW12061K00FKEA Vishay-Dale
R66, R67, R68, R69, R70 5 200 RES, 200 ohm, 1%, 0.125W, 0805 0805 CRCW0805200RFKEA Vishay-Dale
S1, S2 2 Switch, Tactile, SPST-NO, 0.05A, 12V, SMT SW, SPST 6x6 mm 4-1437565-1 TE Connectivity
S3 1 Switch, SPST 7Pos, Rocker, TH 9.65X8X19.8mm 76SB07ST Grayhill
SH-J4, SH-J5, SH-J9, SH-J10, SH- 9 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M SNT-100-BK-G Samtec
J12-3, SH-J12-5, SH-J12-7, SH-J12-
9, SH-J13-3
TP3, TP4, TP5, TP6 4 Black Test Point, TH, Multipurpose, Black Keystone5011 5011 Keystone
U1 1 µC-Controlled AFE Family for 5/10/15-Series Cell Lithium-Ion PW0020A BQ7692000PW Texas Instruments None
and Phosphate Battery Pack Applications, PW0020A
U2 1 CEDV Fuel Gauge and Battery Management Controller DBT0030A BQ78350DBT Texas Instruments None
Companion to the bq769x0 AFE, DBT0030A
W1 1 Cable assembly, 4 pin Assembly CBL002 Texas Instruments - -
C10 0 470pF CAP, CERM, 470pF, 50V, +/-10%, X7R, 0805 0805 08055C471KAT2A AVX
C19 0 3300pF CAP, CERM, 3300pF, 25V, +/-10%, X7R, 0603 0603 GRM188R71E332KA01D MuRata
D3 0 30V Diode, TVS, Uni, 30V, 600W, SMB SMB SMBJ30A-13-F Diodes Inc.
D5 0 16V Diode, Zener, 16V, 500mW, SOD-123 SOD-123 MMSZ5246B-7-F Diodes Inc.
D7 0 600V Diode, Ultrafast, 600V, 8A, TH TO-220AC MUR860G ON Semiconductor
FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or mount. Fiducial N/A N/A
HS1 0 Heatsink, DDPAK/TO-263, SMT Heatsink, DDPAk 573300D00010G Aavid
J11 0 Header, TH, 100mil, 7x1, Gold plated, 230 mil above 7x1 Header TSW-107-07-G-S Samtec
insulator
J15 0 Header, TH, 100mil, 6x1, Gold plated, 230 mil above TSW-106-07-G-S TSW-106-07-G-S Samtec, Inc.
insulator
R1, R2 0 0 RES, 0 ohm, 5%, 0.125W, 0805 0805 CRCW08050000Z0EA Vishay-Dale
R28, R29, R40, R41, R56 0 1.00k RES, 1.00k ohm, 1%, 0.125W, 0805 0805 CRCW08051K00FKEA Vishay-Dale
R33 0 300k RES, 300k ohm, 0.1%, 0.1W, 0603 0603 RG1608P-304-B-T5 Susumu Co Ltd
R34, R35, R42 0 1.00Meg RES, 1.00Meg ohm, 1%, 0.125W, 0805 0805 CRCW08051M00FKEA Vishay-Dale
TP1 0 Black Test Point, TH, Multipurpose, Black Keystone5011 5011 Keystone
34 bq76920 Evaluation Module User's Guide SLVU924C–March 2014–Revised July 2014
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bq76920EVM Circuit Module Physical Construction
Table 4. bq76920 Circuit Module Bill of Materials (continued)
Designator Qty Value Description Package Reference Part Number MFG Alternate Alternate
Part Number MFG
TP2, TP29 0 Red Test Point, TH, Multipurpose, Red Keystone5010 5010 Keystone
TP7, TP8, TP9, TP10, TP11, TP12, 0 White Test Point, TH, Multipurpose, White Keystone5012 5012 Keystone
TP13, TP14, TP15, TP18, TP20,
TP21, TP22, TP24, TP25, TP26,
TP27, TP28, TP33, TP34, TP35,
TP37
35
SLVU924C–March 2014–Revised July 2014 bq76920 Evaluation Module User's Guide
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DSG 1
CHG 2
VSS 3
SDA 4
SCL 5
TS1 6
CAP1 7
REGOUT 8
REGSRC 9
BAT 10
NC
11
VC5
12
VC4
13
VC3
14
VC2
15
VC1
16
VC0
17
SRP
18
SRN
19
ALERT
20
U1
BQ7692000PW
1µF
C1
100
R5
5
4
1
2
3
6
J1
395021006
1µF
C2
1µF
C3
1µF
C4
1µF
C5
1µF
C6
100
R4
100
R6
100
R7
100
R8
100
R9
4.7µF
C16
2.2µF
C13
1.25V
D2
J2
108-0740-001 0.001
R11
100
R10
100
R12
0.1µF
C8
0.1µF
C9
0.1µF
C7
TP10
DNP
TP12
DNP
TP15
DNP
TP8
DNP
TP21
DNP
TP17
TP20
DNP
TP23
DNP
30V
D3
SMBJ30A-13-F
DNP
100
R14
100
R24
100
R25
499k
R13
4
1
2
3
J8
22-05-3041
10.0k
R23
10.0k
R21
TP19
1
2
J5
PEC02SAAN
1
2
J4
PEC02SAAN
J3
108-0740-001
600V
D7
MUR860G
DNP
4
7,8
1,2,3
5,6,
30V
Q1
CSD17501Q5A
4
7,8 1,2,3
5,6,
30V
Q2
CSD17501Q5A
600V
D6
MURS360T3G
1.00Meg
R19
1.00Meg
R15
GND GND
GND
GND
GND
J6
108-0740-001
J7
108-0740-001
0.1µF
C11
0.1µF
C12
0.1µF
C17
0.1µF
C18
1µF
C14
0
R16
1.00k
R17
1.00Meg
R18
-50V
Q3
BSS84W-7-F
16V
D5
MMSZ5246B-7-F
DNP
1.25V
D4
GND
10.0k Ω
t°
R20
4700pF
C15
GND
GND
TP9
DNP
TP11
DNP
TP13
DNP
TP14
DNP
TP7
DNP
TP18
DNP
TP24
DNP
TP27
DNP
TP26
DNP
TP25
DNP
TP22
DNP
NT1
Net-Tie
BATT– GND
BATT-
E2 E4
E3
E1
BATT–
1
2
3
4
S1
4-1437565-1
3.01k
R22
5.6V
D8
5.6V
D9
HS1
573300D00010G
DNP
TP3 TP4 TP5 TP6
TP1
DNP
TP2
DNP
TP29
DNP
TP28
DNP
GND
0
R2
DNP
0
R1
DNP
C5
C4
C3
C2
C1
C0
BAT R
SCL pull up
SDA pull up
BATT+
10.0k
R3
–
Input voltage 0 - 25 V
0 - 15 A
+
–
Output voltage 0 - 25 V
0 - 15 A
+
28V
D1
SMCJ28A
100
R26
100
R27
ALERT
470pF
C10
DNP
DSG
CHG
CAP1 SDA
SCL
REGOUT
C1
C0
C1
C2
C3
C4
C5
BATT+
BATT+
PFD
PACK–
I C
2
BOOT
TP16
bq76920EVM Circuit Module Physical Construction
www.ti.com
Figure 26 through Figure 28 illustrate the schematics.
Figure 26. Schematic Diagram AFE
36 bq76920 Evaluation Module User's Guide SLVU924C–March 2014–Revised July 2014
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NC
1
ALERT
2
SDA
3
SCL
4
PRECHG 5
VAUX
6
BAT
7
PRES
8
KEYIN
9
SAFE 10
SMBD
11
VEN 12
SMBC
13
DISP 14
PWRM 15
LED1 16
LED2 17
LED3 18
LED4 19
LED5 20
VSS 21
VSS 22
VSS 23
MRST
24
VSS 25
VCC
26
RBI 27
NC
28
ADREN 29
SMBA
30
U2
BQ78350DBT
50V
Q6
BSS138
1.00Meg
R54
1.0k
R48
100
R58
100
R61
100
R57
100
R62 4
1
2
3
J14
22-05-3041
GND
BATT–
E7 E8
BATT–
1.00Meg
R60
1.00Meg
R59
GND
GND
1
2
3
4
S2
4-1437565-1
1
2
J10
PEC02SAAN
100
R31
100
R36
100
R32
100
R37
BATT-
1
2
J9
PEC02SAAN
50V
Q8
BSS138
MMBT3906
Q7
10.0k
R51
1.25V
D12
GND
0.1µF
C22
10.0k
R55
TP34
DNP
TP35
DNP
TP32
196k
R49
49.9k
R53
100k
R52
Green
D17
Green
D16
Green
D15
Green
D14
Green
D18
221k
R63
GND
GND
GND
GND
GND
0.1µF
C21
1
2
3
J13
PEC03SAAN
GND
1.00Meg
R34
DNP
1.00Meg
R35
DNP
GND
ALT
16/17
Addr select
GG_PWR
GG_SCL
GG_SDA
GG_ALERT
GG_/KEYIN
GG_/PRES
SMBA
16V
D13
MMSZ5246B-7-F
5.6V
D11
5.6V
D10
5.6V
D20
5.6V
D19
TP37
TP33
DNP
/KEYIN
/PRES
1 2
3 4
5 6
7 8
9 10
J12
PEC05DAAN
GND
GG_PWR
0
R30
TP36
AFE-GG
BCX5616TA
1
32,4
Q9
SMB
0.1µF
C23
GND
DISPLAY
100k
R50E6E5
SCL
SDA
REGOUT
ALERT
C5
CAP1
PFD PACK–
1.00k
R40
DNP
1.00k
R41
DNP
300k
25 ppm/C
R38
13.7k
25 ppm/C
R43
50V
Q5
BSS138
-50V
Q4
BSS84W-7-F
100k
R45
TP30 TP31
100k
R44
5
4
1
2
3
6
7
J11
TSW-107-07-G-S
DNP
13.7k
25 ppm/C
R39
GND GND GND
3300pF
C20
3300pF
C19
DNP
GND
300k
25 ppm/C
R33
DNP
1.00k
R28
DNP
1.00k
R29
DNP
CHG
DSG
1.00k
R56
DNP
EDSG
ECHG
EPM
EVEN
EVAUX
0
R46
1.00Meg
R42
DNP 1.00Meg
R47
EPCHG
DNP
www.ti.com
bq76920EVM Circuit Module Physical Construction
Figure 27. Schematic Diagram Gauge
37
SLVU924C–March 2014–Revised July 2014 bq76920 Evaluation Module User's Guide
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200
R66
200
R67
200
R68
200
R69
200
R70
1.00k
R65
1
2
3
4
5
6
13
14
7
12
10
11
8
9
S3
76SB07ST
Orange
D21
GND
5
4
1
2
3
6
J15
DNP
BATT–
Test points
BATT+
C5
C4
C3
C2
C1
C0
1.00k
R64
bq76920EVM Circuit Module Physical Construction
www.ti.com
Figure 28. Schematic Diagram Cell Simulator
38 bq76920 Evaluation Module User's Guide SLVU924C–March 2014–Revised July 2014
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Copyright © 2014, Texas Instruments Incorporated
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Related Documents From Texas Instruments
8 Related Documents From Texas Instruments
Document Literature
Number
bq76920, bq76930, bq76940 μC-Controlled AFE Family for 5-, 10-, and 15-Series SLUSBK2
Cell Lithium-Ion and Phosphate Battery Pack Applications Data Sheet
bq78350 CEDV Li-Ion Gas Gauge and Battery Management Controller Companion SLUSB48
Data Sheet
bq78350 Technical Reference Manual SLUUAN7
Revision History
Changes from Original (March 2014) to A Revision ....................................................................................................... Page
• Changed EVM Connection for Basic Gauge Operation image...................................................................... 7
• Changed software display image........................................................................................................ 8
• Changed registers view image......................................................................................................... 10
Revision History
Changes from A Revision (April 2014) to B Revision .................................................................................................... Page
• Changed software title to bq76940/bq76930/bq76920 Evaluation Software in step one of the Quick Start section and
globally throughout document. .......................................................................................................... 5
• Changed path name to ...'\bq76940' in second paragraph of Interface Adapter section......................................... 7
• Added clarification about device identifiers in menus or windows in the bq76940/bq76930/bq76920 Software section.... 7
• Added sentence about how to start the software in the Software Operation section............................................. 8
• Changed Evaluation Software Display image. ........................................................................................ 8
• Added Sequence_Example.bqseq to paragraph below Sequence View image................................................. 12
• Changed content in the BOM in rows containing U1 and U2 in the Designator column. ...................................... 33
39
SLVU924C–March 2014–Revised July 2014 Revision History
Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated
Revision History
www.ti.com
Revision History
Changes from B Revision (April 2014) to C Revision .................................................................................................... Page
• Added 'AFE and bq78350 gauge' to second sentence in the Abstract............................................................. 1
• Changed '...the bq76920 registers...' to '...the device registers...' in the Abstract. ............................................... 1
• Changed '5-cell Li-Ion and Li-Polymer' to '5-cell Li-Ion and Phosphate' in the first Features bullet............................ 3
• Changed 'parallel' to 'series' in the first sentence of the bq76920 Circuit Module Performance Specification Summary
section. ..................................................................................................................................... 3
• Added 'for the AFE 2.5 A for the gauge' to first bullet in Required Equipment section. ......................................... 3
• Deleted bullet containing 'TI bq76940/bq76930/bq76920 Evaluation Software' in Required Equipment section............. 3
• Added 'calibrated load or load with accurate current meter required for gauge evaluation' to sixth bullet in Required
Equipment section......................................................................................................................... 3
• Added Quick Start section with introduction and moved AFE Quick Start to Quick Start subsection.......................... 4
• Changed step 1 in AFE Quick Start section, moved install instruction from step 1 to step 2. .................................. 4
• Added AFE to EVM Connection for Basic AFE Operation figure caption.......................................................... 5
• Added Gauge Quick Start section....................................................................................................... 5
• Changed Interface Adapter section to a main heading and changed content of section. ....................................... 7
• Added 'bqStudio software' to first paragrph of the Interface Adapter section. .................................................... 7
• Changed bq76940/bq76930/bq76920 Software section to a new heading number and added clarification in first
paragraph................................................................................................................................... 7
• Added Interface Adapter section with bq769x0-specific instructions. .............................................................. 8
• Added Battery Management Studio Software section............................................................................... 13
• Added sentence to end of Evaluating with Simulated Current section............................................................ 22
• Added paragraph to end of Reducing the Cell Count section...................................................................... 23
• Changed first sentence of Connecting to a Host section........................................................................... 24
• Changed entire content of Gauge Circuits section. ................................................................................. 24
• Added last two paragraphs in Unused Components section....................................................................... 24
• Added link to bq78350 Technical Reference Manual in related documents. .................................................... 39
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
40 Revision History SLVU924C–March 2014–Revised July 2014
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autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout
brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain
maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à
l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente
(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel
d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans
cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2014, Texas Instruments Incorporated
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Important Notice for Users of EVMs Considered “Radio Frequency Products” in Japan
EVMs entering Japan are NOT certified by TI as conforming to Technical Regulations of Radio Law of Japan.
If user uses EVMs in Japan, user is required by Radio Law of Japan to follow the instructions below with respect to EVMs:
1. Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and
Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of
Japan,
2. Use EVMs only after user obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to EVMs, or
3. Use of EVMs only after user obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect
to EVMs. Also, do not transfer EVMs, unless user gives the same notice above to the transferee. Please note that if user does not
follow the instructions above, user will be subject to penalties of Radio Law of Japan.
http://www.tij.co.jp
【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 本開発キットは技術基準適合証明を受けておりません。 本製品の
ご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。
1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用いただく。
2. 実験局の免許を取得後ご使用いただく。
3. 技術基準適合証明を取得後ご使用いただく。。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。
日本テキサス・インスツルメンツ株式会社
東京都新宿区西新宿６丁目２４番１号
西新宿三井ビル
http://www.tij.co.jp Texas Instruments Japan Limited
(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan
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