Charge Pump Driven 9-Channel LED Driver with
Automated LED Lighting Effects
Data Sheet
ADP8866
Rev. B Document Feedback
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FEATURES
Charge pump with automatic gain selection of 1×, 1.5×, and
2× for maximum efficiency
92% peak efficiency
9 independent and programmable LED drivers
Each driver is capable of 25 mA (full scale)
Each driver has 7 bits (128 levels) of nonlinear current
settings
Standby mode for <1 µA current consumption
16 programmable fade-in and fade-out times (0.0 sec to
1.75 sec) with choice of square or cubic rates
Automated and customizable LED blinking
Unique heartbeat mode for programmable double pulse
lighting effects on 4 channels (D6 to D9)
PWM input for implementing content adjustable brightness
control (cABC)
I2C compatible interface for all programming
Dedicated reset pin and built-in power on reset (POR)
Short circuit, overvoltage, and overtemperature protection
Internal soft start to limit inrush currents
Input to output isolation during faults or shutdown
Operates down to VIN = 2.5 V, with undervoltage lockout
(UVLO) at 1.9 V
Small lead frame chip scale package (LFCSP)
APPLICATIONS
Mobile display backlighting
Mobile phone keypad backlighting
LED indication and status lights
Automated LED blinking
TYPICAL OPERATING CIRCUIT
09478-001
D1 D2 D3 D4 D5 D7D6 D8 D9
nRST
SDA
SCL
nINT
GND
VIN
1µF
C2+
C2–
C2
1µF
C1+
C1–
C1
1µF
VOUT
1µF
ADP8866
Figure 1.
GENERAL DESCRIPTION
The ADP8866 combines a programmable backlight LED charge
pump driver with automatic blinking functions. Nine LED drivers
can be independently programmed at currents up to 25 mA.
The current level, fade time, and blinking rate can be programmed
once and executed autonomously on a loop. Separate fade-in
and fade-out times can be set for the backlight LEDs.
Driving all of this is a two-capacitor charge pump with gains of
1×, 1.5×, and 2×. This setup is capable of driving a maximum
IOUT of 240 mA from a supply of 2.5 V to 5.5 V. A full suite of
safety features including short-circuit, overvoltage, and over-
temperature protection allows easy implementation of a safe
and robust design. Additionally, input inrush currents are
limited via an integrated soft start combined with controlled
input to output isolation.
ADP8866 Data Sheet
Rev. B | Page 2 of 52
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Operating Circuit ................................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Maximum Temperature Ranges ................................................. 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 11
Power Stage.................................................................................. 12
Operating Modes ........................................................................ 13
LED Groups................................................................................. 14
Output Current Settings ............................................................ 14
Output Current Range Selection .............................................. 14
PWM Dimming .......................................................................... 14
Automated Fade-in and Fade-Out ........................................... 14
CABC Fade Disable.................................................................... 15
Independent Sink Control (ISC) .............................................. 15
Advanced Blinking Controls .................................................... 16
Short-Circuit Protection (SCP) Mode ..................................... 17
Overvoltage Protection (OVP) ................................................. 17
Thermal Shutdown (TSD)/Overtemperature Protection ..... 17
Interrupts ..................................................................................... 19
Backlight Off Interrupt .............................................................. 19
Independent Sink Off Interrupt ............................................... 19
Applications Information .............................................................. 20
Layout Guidelines....................................................................... 20
I2C Programming and Digital Control ........................................ 21
Register Descriptions ..................................................................... 22
Backlight Register Descriptions ............................................... 29
Independent Sink Register Descriptions ................................. 34
Outline Dimensions ....................................................................... 50
Ordering Guide .......................................................................... 50
REVISION HISTORY
11/2017—Rev. A to Rev. B
Changed CP-20-10 to CP-20-8 .................................... Throughout
Updated Outline Dimensions ....................................................... 50
Changes to Ordering Guide .......................................................... 50
1/2014—Rev. 0 to Rev. A
Changes to Figure 40 and Figure 41 ............................................. 21
3/2011—Revision 0: Initial Version
Data Sheet ADP8866
Rev. B | Page 3 of 52
SPECIFICATIONS
VIN = 3.6 V, SCL = 2.7 V, SDA = 2.7 V, nINT = open, nRST = 2.7 V, VD1:D9 = 0.4 V, C1 = 1 μF, C2 = 1 μF, COUT = 1 μF, typical values are at
TJ = 25°C and are not guaranteed. Minimum and maximum limits are guaranteed from TJ = −40°C to +105°C, unless otherwise noted.
Table 1.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
SUPPLY
Input Voltage
Operating Range VIN 2.5 5.5 V
Startup Level VIN( STAR T ) VIN increasing 1.98 2.25 V
Low Level VIN(STOP) VIN decreasing 1.75 1.90 V
V
IN(S TAR T )
Hysteresis
V
IN(HYS)
After startup
80
mV
UVLO Noise Filter tUVLO 10 μs
Quiescent Current IQ
During Standby IQ(STBY) VIN = 3.6 V, Bit nSTBY = 0, SCL = SDA =
0 V
0.25 1.0 μA
Current Consumption
During Blinking Off Time
IQ(OFF) VIN = 3.6 V, Bit nSTBY = 1, IOUT = 0 mA
Measured during blinking off time
245 325 μA
Switching IQ(ACTIVE) VIN = 3.6 V, Bit nSTBY = 1, IOUT = 0 mA
Gain = 1.0× 1.2 2.0 mA
Gain = 1.5× 3.7 5.4 mA
Gain = 2.0× 4.3 6.2 mA
OSCILLATOR Charge pump gain = 2×
Switching Frequency fSW 0.8 1 1.2 MHz
Duty Cycle D 50 %
OUPUT CURRENT CONTROL
Maximum Drive Current ID1:D9(MAX) VD1:D9 = 0.4 V
T
J
= 25°C
23.0
25.0
27.0
mA
TJ = −40°C to +85°C 22.5 27.5 mA
LED Current Source Matching IMATC H
All Current Sinks IMATCH9 VD1:D9 = 0.4 V 1.4 %
D1 to D5 Current Sinks IMATCH5 VD1:D5 = 0.4 V 1.1 %
Leakage Current on LED Pins ID1:D9(LKG) VIN = 5.5 V, VD1:D9 = 2.5 V, Bit nSTBY = 1 0.5 μA
Equivalent Output Resistance ROUT
Gain = 1× VIN = 3.6 V, IOUT = 100 mA 0.5 Ω
Gain = 1.5× VIN = 3.1 V, IOUT = 100 mA 3.0 Ω
Gain = 2× VIN = 2.5 V, IOUT = 100 mA 3.8 Ω
Regulated Output Voltage VOUT(REG) VIN = 3 V, gain = 2×, IOUT = 10 mA 4.4 4.9 5.2 V
AUTOMATIC GAIN SELECTION
Minimum Voltage
Gain Increases VHR(UP) Decrease VDX until the gain switches up 145 200 240 mV
Minimum Current Sink
Headroom Voltage
VHR(MIN) IDX = IDX(MAX) × 95% 210 mV
Gain Delay tGAIN The delay after gain has changed and
before gain is allowed to change again
100 μs
FAULT PROTECTION
Startup Charging Current
Source
ISS VIN = 3.6 V, VOUT = 0.8 × VIN 3.5 7 11 mA
Output Voltage Threshold VOUT
Exit Soft Start VOUT(START) VOUT rising 0.92 × VIN V
Short-Circuit Protection VOUT(SC) VOUT falling 0.55 × VIN V
Output Overvoltage Protection VOVP
Activation Level 5.7 6.0 V
OVP Recovery Hysteresis 500 mV
ADP8866 Data Sheet
Rev. B | Page 4 of 52
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
Thermal Shutdown
Threshold TSD Increasing temperature 150 °C
Hysteresis TSD(HYS) 20 °C
Isolation from Input to
Output During Fault
IOUTLKG V
IN = 5.5 V, VOUT = 0 V, Bit nSTBY = 0 1 μA
Time to Validate a Fault tFAULT 2 μs
I2C INTERFACE
VDDIO Voltage Operating Range VDDIO 5.5 V
Logic Low Input VIL V
IN = 2.5 V 0.5 V
Logic High Input VIH V
IN = 5.5 V 1.55 V
I2C TIMING SPECIFICATIONS Guaranteed by design
Delay from Reset Deassertion
to I2C Access
tRESET 20 μs
SCL Clock Frequency fSCL 400 kHz
SCL High Time tHIGH 0.6 μs
SCL Low Time tLOW 1.3 μs
Setup Time
Data tSU, DAT 100 ns
Repeated Start tSU, STA 0.6 μs
Stop Condition tSU, STO 0.6 μs
Hold Time
Data tHD, DAT 0 0.9 μs
Start/Repeated Start tHD, STA 0.6 μs
Bus Free Time (Stop and Start
Conditions)
tBUF 1.3 μs
Rise Time (SCL and SDA) tR 20 + 0.1 × CB 300 ns
Fall Time (SCL and SDA) tF 20 + 0.1 × CB 300 ns
Pulse Width of Suppressed
Spike
tSP 0 50 ns
Capacitive Load Per Bus Line CB 400 pF
Timing Diagram
SDA
SCL
S
S = START CONDITION
Sr = REPEATED START CONDITION
P = STOP CONDITION
Sr P S
t
LOW
t
R
t
HD, DAT
t
HIGH
t
SU, DAT
t
F
t
F
t
SU, STA
t
HD, STA
t
SP
t
SU, STO
t
BUF
t
R
09478-002
Figure 2. I2C Interface Timing Diagram
Data Sheet ADP8866
Rev. B | Page 5 of 52
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
VIN, VOUT to GND −0.3 V to +6 V
D1, D2, D3, D4, D5, D6, D7, D8, and D9 to
GND
−0.3 V to +6 V
nINT, nRST, SCL, and SDA to GND −0.3 V to +6 V
Output Short-Circuit Duration Indefinite
Operating Ambient Temperature Range −40°C to +85°C1
Operating Junction Temperature Range −40°C to +125°C
Storage Temperature Range
−65°C to +150°C
Soldering Conditions JEDEC J-STD-020
ESD (Electrostatic Discharge)
Human Body Model (HBM) ±2.0 kV
Charged Device Model (CDM) ±1.5 kV
1 The maximum operating junction temperature (TJ(MAX)) supersedes the
maximum operating ambient temperature (TA(MAX)). See the Maximum
Temperature Ranges section for more information.
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
Absolute maximum ratings apply individually only, not in
combination. Unless otherwise specified, all voltages are
referenced to GND.
MAXIMUM TEMPERATURE RANGES
The maximum operating junction temperature (TJ(MAX))
supersedes the maximum operating ambient temperature
(TA(MAX)). Therefore, in situations where the ADP8866 is
exposed to poor thermal resistance and a high power dissipation
(PD), the maximum ambient temperature may need to be derated.
In these cases, the ambient temperature maximum can be
calculated with the following equation:
TA(MAX) = TJ(MAX) − (θJA × PD(MAX)).
THERMAL RESISTANCE
The θJA (junction to air) and θJC (junction to case) are
determined according to JESD51-9 on a 4-layer printed circuit
board (PCB) with natural convection cooling. The exposed pad
must be soldered to GND.
Table 3. Thermal Resistance
Package Type θJA θJC Unit
LFCSP
38.6
3.56
°C/W
ESD CAUTION
ADP8866 Data Sheet
Rev. B | Page 6 of 52
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
09478-003
14
13
12
1
3
4
VIN
15 GND
VOUT
C2+
11 C1+
D3
D1
2
D2
D9
5
nRST
7
SDA
6
SCL
8
nINT
9
C1–
10
C2–
19 D5
20 D4
18 D6
17 D7
16 D8
ADP8866
TOP VIEW
(Not to Scale)
NOTES
1. CONNECT THE EXPOSED
PADDLE TO GND.
Figure 3. LFCSP Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
14 VIN Battery Voltage 2.5 V to 5.5 V.
3 D1 LED Sink 1 Output.
2 D2 LED Sink 2 Output.
1 D3 LED Sink 3 Output.
20 D4 LED Sink 4 Output.
19 D5 LED Sink 5 Output.
18 D6 LED Sink 6 Output.
17 D7 LED Sink 7 Output.
16 D8 LED Sink 8 Output.
4 D9 LED Sink 9 Output.
13 VOUT Charge Pump Output.
11 C1+ Charge Pump C1+.
9 C1− Charge Pump C1−.
12 C2+ Charge Pump C2+.
10 C2− Charge Pump C2−.
15 GND Ground. Connect the exposed paddle to GND.
8 nINT Processor Interrupt (Active Low). Requires an external pull-up resistor. If this pin is not used, it can be left
floating. Alternatively, this pin can be set as the PWM input for implementing cABC dimming (see the
PWM Dimming section).
5 nRST Hardware Reset Input (Active Low). This bit resets the device to the default conditions. If not used, this pin
must be tied above VIH(MAX).
7 SDA I2C Serial Data Input. Requires an external pull-up resistor.
6 SCL I2C Clock Input. Requires an external pull-up resistor.
Data Sheet ADP8866
Rev. B | Page 7 of 52
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6 V, SCL = 2.7 V, SDA = 2.7 V, nRST = 2.7 V, VD1:D9 = 0.4 V, IOUT = 0 mA, CIN = 1 μF, C1 = 1 μF, C2 = 1 μF, COUT = 1 μF, TA= 25°C,
unless otherwise noted.
1400
1200
1000
800
600
400
200
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
IQ (µA)
09478-004
+105°C
+85°C
+25°C
–40°C
Figure 4. Typical Operating Current, G = 1×
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
IQ (mA)
09478-005
+105°C
+85°C
+25°C
–40°C
Figure 5. Typical Operating Current, G = 1.5×
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
IQ (mA)
09478-006
+105°C
+85°C
+25°C
–40°C
Figure 6. Typical Operating Current, G = 2×
400
350
300
250
200
150
100
50
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
IN
(V)
I
Q (OFF)
(µA)
09478-007
+105°C
+85°C
+25°C
–40°C
Figure 7. Typical Off Time Current (IQ(OFF))
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
IN
(V)
STANDBY I
Q
(µA)
09478-008
+105°C
+85°C
+25°C
–40°C
SCL = SDA = 0V
Figure 8. Typical Standby IQ
27.0
26.5
26.0
25.5
25.0
24.5
24.0
23.5
23.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
IN
(V)
I
LED
(mA)
09478-009
+105°C
+85°C
+25°C
–40°C
Figure 9. Typical Diode Current vs. VIN
ADP8866 Data Sheet
Rev. B | Page 8 of 52
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
IN
(V)
MATCHING (%)
09478-010
+105°C
+85°C
+25°C
–40°C
I
D1:D9
= 25mA
Figure 10. Typical Diode Matching vs. VIN
26.5
26.0
25.5
25.0
24.5
24.0
23.5
27.0
23.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
V
HR
(V)
I
LED
CURRENT (mA)
09478-011
+105°C
+85°C
+25°C
–40°C
Figure 11. Typical Diode Matching vs. Current Sink Headroom Voltage (VHR)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1.6
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
V
HR
(V)
MATCHING (%)
09478-012
+105°C
+85°C
+25°C
–40°C
I
D1:D9
= 25mA
Figure 12. Typical Diode Current vs. Current Sink Headroom Voltage (VHR)
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–40 –15 10 35 60 85 110
TEMPERATURE (°C)
I
OUT
DEVIATION (%)
09478-013
I
OUT
= 100mA
Figure 13. Typical Change in Diode Current vs. Temperature
1.2
1.0
0.8
0.6
0.4
0.2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
IN
(V)
R
OUT
(Ω)
09478-014
+105°C
+85°C
+25°C
–40°C
I
OUT
= 100mA
Figure 14. Typical ROUT (G = 1×) vs. VIN
6
5
4
3
2
1
0
2.2 2.4 2.6 2.8 3.0 3.2 3.4
V
IN
(V)
R
OUT
(Ω)
09478-015
+105°C
+85°C
+25°C
–40°C
I
OUT
= 100mA
Figure 15. Typical ROUT (G = 1.5×) vs. VIN
Data Sheet ADP8866
Rev. B | Page 9 of 52
6
5
4
3
2
1
0
2.2 2.3 2.4 2.5 2.6 2.7 2.8
V
IN
(V)
R
OUT
(Ω)
09478-016
+105°C
+85°C
+25°C
–40°C
I
OUT
= 100mA
Figure 16. Typical ROUT (G = 2×) vs. VIN
20
18
16
14
12
10
8
6
4
2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
IN
(V)
I
SS
(mA)
09478-017
+105°C
+85°C
+25°C
–40°C
VOUT = 80% OF VIN
Figure 17. Typical Output Soft Start Current, ISS
30
25
20
15
10
5
0
0 20 40 60 80 100
PWM DUTY CYCLE (%)
AVERAGE LED CURRENT (mA)
09478-018
+85°C
+25°C
–40°C
Figure 18. Typical Average IOUT vs. PWM Duty (fPWM = 300 Hz)
1.4
1.0
1.2
0.6
0.8
0.2
0.4
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
IN
(V)
THRESHOLD (V)
09478-019
V
IL
, +25°C
V
IH
, +25°C
V
IL
, –40°C
V
IH
, –40°C
V
IL
, +85°C
V
IH
, +85°C
V
IL
, +105°C
V
IH
, +105°C
Figure 19. Typical I2C Thresholds, VIH and VIL
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
–40 –15 10 35 60 85 110
TEMPERATURE (°C)
V
OUT(REG)
(V)
09478-020
Figure 20. Typical Regulated Output Voltage (VOUT(REG))
6.0
5.9
5.8
5.7
5.6
5.5
5.4
5.3
5.2
5.1
5.0
–40 –15 10 35 60 85 110
TEMPERATURE (°C)
V
OUT
(V)
09478-021
THRESHOLD
RECOVERY
Figure 21. Typical Overvoltage Protection (OVP) Threshold
ADP8866 Data Sheet
Rev. B | Page 10 of 52
100
90
80
70
60
50
40
30
20
10
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
IN
(V)
EFFICIENCY (%)
09478-022
V
F
= 3.4V
V
F
= 4.0V
Figure 22. Typical Efficiency (Each LED Set to 25 mA)
09478-024
1µs/DIV
1
2
3
V
IN
(AC-COUPLED) 50mV/DIV
V
OUT
(AC-COUPLED) 50mV/DIV
I
IN
(AC-COUPLED) 10mA/DIV
T
C
IN
= 1µF, C
OUT
= 1µF, C1 = 1µF, C2 = 1µF
V
IN
= 3.6V
I
OUT
= 120mA
Figure 23. Typical Operating Waveforms, G = 1×
09478-025
1µs/DIV
1
2
3
V
IN
(AC-COUPLED) 50mV/DIV
V
OUT
(AC-COUPLED) 50mV/DIV
I
IN
(AC-COUPLED) 10mA/DIV
T
C
IN
= 1µF, C
OUT
= 1µF, C1 = 1µF, C2 = 1µF
V
IN
= 3.0V
I
OUT
= 120mA
Figure 24. Typical Operating Waveforms, G = 1.5×
09478-026
1µs/DIV
1
2
3
V
IN
(AC-COUPLED) 50mV/DIV
V
OUT
(AC-COUPLED) 50mV/DIV
I
IN
(AC-COUPLED) 10mA/DIV
T
C
IN
= 1µF, C
OUT
= 1µF, C1 = 1µF, C2 = 1µF
V
IN
= 2.5V
I
OUT
= 120mA
Figure 25. Typical Operating Waveforms, G = 2×
09478-027
100µs/DIV
2
4
I
IN
(10mA/DIV)
V
OUT
(1V/DIV)
I
OUT
(10mA/DIV)
T
3
C
IN
= 10µF, C
OUT
= 1µF, C1 = 1µF, C2 = 1µF
V
IN
= 3.6V
Figure 26. Typical Startup Waveforms
Data Sheet ADP8866
Rev. B | Page 11 of 52
THEORY OF OPERATION
The ADP8866 combines a programmable backlight LED charge
pump driver with automatic blinking functions. Nine LED drivers
can be independently programmed at currents up to 25 mA.
The current level, fade time, and blinking rate can be programmed
once and executed autonomously on a loop. Separate fade-in
and fade-out times can be set for the backlight LEDs.
Driving all of this is a two capacitor charge pump with gains of
1×, 1.5×, and 2×. This setup is capable of driving a maximum
IOUT of 240 mA from a supply of 2.5 V to 5.5 V. A full suite of
safety features including short-circuit, overvoltage, and over-
temperature protection allows easy implementation of a safe
and robust design. Additionally, input inrush currents are
limited via an integrated soft start combined with controlled
input to output isolation.
09478-028
C1
1µF
C2
1µF
nINT
C
OUT
VOUT
C
IN
VIN V
REFS
I
REFS
STANDBY EN
VIN
C1+
SDA
SCL
I
2
C LOGIC
STANDBY
ILED CONTROL C1–
C2+
C2–
nRST
NOISE FILTER
50µs
RESET
D2 D3 D4 D5 D6 D7
D1
ID1 ID2 ID3 ID4 ID5 ID6 ID7
GAIN
SELECT
LOGIC
CHARGE
PUMP
LOGIC
GND
CLK
UVLO
CHARGE
PUMP
(1x, 1.5x, 2x)
SOFT
START
LED
OUTPUT
CURRENT
ID1
ID2
ID3
ID4
ID5
ID6
ID7
I
SS
D8 D9
ID8 ID9
ID8
ID9
nINT MUX INT
PWM
VIN
GAIN CONTROL
Figure 27. Detailed Block Diagram
ADP8866 Data Sheet
Rev. B | Page 12 of 52
POWER STAGE
Typical white LEDs require up to 4 V to drive them. Therefore,
some form of boosting is required to cover the typical Li Ion
battery voltage variation. The ADP8866 accomplishes this with
a high efficiency charge pump capable of producing a maximum
IOUT of 240 mA over the entire input voltage range of 2.5 V to
5.5 V. Charge pumps use the basic principle that a capacitor
stores charge based on the voltage applied to it, as shown in the
following equation:
Q = C × V (1)
By charging the capacitors in different configurations, the
charge and, therefore, the gain can be optimized to deliver the
voltage required to power the LEDs. Because a fixed charging
and discharging combination must be used, only certain
multiples of gain are available. The ADP8866 is capable of
automatically optimizing the gain (G) from 1×, 1.5×, and 2×.
These gains are accomplished with two capacitors and an
internal switching network.
In G = 1× mode, the switches are configured to pass VIN
directly to VOUT. In this mode, several switches are connected
in parallel to minimize the resistive drop from input to output.
In G = 1.5× and G = 2× modes, the switches alternatively charge
from the battery and discharge into the output. For G = 1.5×,
the capacitors are charged from VIN in series and are discharged to
VOUT in parallel. For G = 2×, the capacitors are charged from
VIN in parallel and are discharged to VOUT in parallel. In
certain fault modes, the switches are opened and the output is
physically isolated from the input.
Automatic Gain Selection
Each LED that is driven requires a current source. The voltage
on this current source must be greater than a minimum headroom
voltage (VHR(MIN) in Table 1) to maintain accurate current
regulation. The gain is automatically selected based on the
minimum voltage (VDX) at all of the current sources. At startup,
the device is placed into G = 1× mode and the output charges to
VIN. If any VDX level is less than the required headroom, the
gain is increased to the next step (G = 1.5×). A 100 μs delay is
allowed for the output to stabilize prior to the next gain
switching decision. If there remains insufficient current sink
headroom, the gain is increased again to 2×. Conversely, to
optimize efficiency, it is not desirable for the output voltage to be
too high. Therefore, the gain reduces when the headroom
voltage is too great. This point (labeled VDMAX in Figure 28) is
internally calculated to ensure that the lower gain still results in
ample headroom for all the current sinks. The entire cycle is
illustrated in Figure 28.
09478-029
NOTES
1. V
DMAX
IS THE CALCULATED GAIN DOWN TRANSITION POINT.
WAIT
100µs (TYP) MIN (V
D1:D9
) < V
HR(UP)
0
0
1
1
1
1
0
0
STARTUP:
CHARGE
V
IN
TO V
OUT
EXIT STANDBY
VOUT > V
OUT(START)
1
WAIT
100µs (TYP)
WAIT
100µs (TYP)
MIN (V
D1:D9
) < V
HR(UP)
MIN (V
D1:D9
) > V
DMAX
MIN (V
D1:D9
) < V
DMAX
G = 2
G = 1.5
EXIT
STARTUP
G = 1
STANDBY
0
Figure 28. State Diagram for Automatic Gain Selection
Data Sheet ADP8866
Rev. B | Page 13 of 52
Note that the gain selection criteria applies only to active
current sources. If a current source has been deactivated
through an I2C command (that is, only five LEDs are used for
an application), the voltages on the deactivated current sources
are ignored.
Soft Start Feature
At startup (either from UVLO activation or fault/standby
recovery), the output is first charged by ISS (7.0 mA typical)
until it reaches about 92% of VIN. This soft start feature reduces
the inrush current that is otherwise present when the output
capacitance is initially charged to VIN. When this point is
reached, the controller enters 1× mode. If the output voltage is
not sufficient, the automatic gain selection determines the
optimal point as defined in the Automatic Gain Selection section.
OPERATING MODES
There are four different operating modes: active, standby,
shutdown, and reset.
Active Mode
In active mode, all circuits are powered up and in a fully
operational state. This mode is entered when nSTBY (in
Register MDCR) is set to 1.
Standby Mode
Standby mode disables all circuitry except for the I2C receivers.
Current consumption is reduced to less than 1 μA. This mode is
entered when nSTBY is set to 0 or when the nRST pin is held
low for more than 100 μs (maximum). When standby is exited,
a soft start sequence is performed.
Shutdown Mode
Shutdown mode disables all circuitry, including the I2C receivers.
Shutdown occurs when VIN is below the undervoltage thresholds.
When VIN rises above VIN(START) (2.0 V typical), all registers are
reset and the part is placed into standby mode.
Reset Mode
In reset mode, all registers are set to their default values and the
part is placed into standby. There are two ways to reset the part:
power on reset (POR) and the nRST pin. POR is activated any-
time that the part exits shutdown mode. After a POR sequence
is complete, the part automatically enters standby mode.
After startup, the part can be reset by pulling the nRST pin low.
As long as the nRST pin is low, the part is held in a standby state
but no I2C commands are acknowledged (all registers are kept
at their default values). After releasing the nRST pin, all registers
remain at their default values, and the part remains in standby;
however, the part does accept I2C commands.
The nRST pin has a 50 μs (typical) noise filter to prevent inad-
vertent activation of the reset function. The nRST pin must be
held low for this entire time to activate reset.
The operating modes function according to the timing diagram
in Figure 29.
V
IN
nSTB
Y
nRST
V
OUT
V
IN
SHUTDOWN
V
IN
CROSSES ~2.0V AND TRIGGERS POWER ON RESET
BIT nSTBY IN REGISTER
MDCR GOES HIGH
nRST MUST BE HIGH FOR 20µs (MAX)
BEFORE SENDING I
2
C COMMANDS
nRST IS LOW, WHICH FORCES nSTBY LOW
AND RESETS ALL I
2
C REGISTERS
GAIN CHANGES ONLY OCCUR WHEN NECESSARY
BUT HAVE A MINIMUM TIME BEFORE
CHANGING
~100µs DELAY BETWEEN POWER UP AND
WHEN I
2
C COMMANDS CAN BE RECEIVED
~7.0mA CHARGES
V
OUT
TO V
IN
LEVEL
25µs TO 100µs NOISE FILTER
1×
1.5×
2×
SOFT STARTSOFT START 10µs 100µs
0
9478-030
Figure 29. Typical Timing Diagram
ADP8866 Data Sheet
Rev. B | Page 14 of 52
LED GROUPS
The nine LED channels can be separated into two groups: backlight
(BL) and independent sinks (ISC). The group select is done in
Register 0x09 and Register 0x0A, with the default being that all
LEDs are part of the backlight.
Each group has its own fade-in and fade-out times (Register
0x12 for backlight and Register 0x22 for ISCs). Each group also
has its own master enable located in Register 0x01. However,
this master enable is overwritten if any of the SCx_EN bits
(Register 0x1A and Register 0x1B) in a group are set high. This
allows complete independent control of each LED channel in
both groups.
OUTPUT CURRENT SETTINGS
The current setting is determined by a 7-bit code programmed
by the user into diode current control registers (Register 0x13
for the backlight and Register 0x23 to Register 0x2B for the
independent sinks). The 7-bit resolution allows the user to set
the backlight to one of 128 different levels between 0 mA and
25 mA. The ADP8866 implements a square law algorithm to
achieve a nonlinear relationship between input code and
backlight current. The LED output current (in milliamperes) is
determined by the following equation:
2
127
CurrentScaleFull
Codet(mA)LED_Curren
(2)
where:
Code is the input code programmed by the user.
Full-Scale Current is the maximum sink current allowed
per LED.
OUTPUT CURRENT RANGE SELECTION
The default maximum current range of each sink of the
ADP8866 is 25.0 mA (typical). However, the ADP8866 also
allows the user to select an alternative maximum current range
to be applied to one or more LEDs. This alternate current range
still has 128 codes for its current setting. This provides
improved resolution when operating at reduced maximum
currents. One of up to 60 alternate current ranges can be
selected. An example of some of the available current ranges is
shown below. For the complete list, see Table 23.
Table 5. Example Current Range Options in Register 0x07
LEVEL_SET Code Range
000010 25.00 mA
001100 12.50 mA
010110 8.33 mA
100000 6.25 mA
101010 5.00 mA
25
20
15
10
5
0
0 12010080604020
OUTPUT CURRENT (mA)
OUTPUT CURRENT CODE (0 TO 127)
09478-031
25.00mA
12.50mA
8.33mA
6.25mA
5.00mA
Figure 30. Output Code Effect on Various LEVEL_SET Ranges
The LEDs that receive this alternate current range are determined
by the DxLVL bits in Register 0x07 and Register 0x08.
PWM DIMMING
Setting the LEVEL_SET code to 111111 (binary) allows the
ADP8866 to dim its LEDs based on a PWM signal applied to the
nINT pin. The LED output current is pulse width modulated with
the signal applied to the nINT pin. The typical waveform and
timing are shown in Figure 29. Due to the inherent delays and
rise/fall times of this system, the best accuracy of the average output
current is obtained with PWM frequencies below 1 kHz.
09478-032
TIME
LED OUTPUT
CURRENT
nTNT PIN
(INPUT)
Figure 31. PWM Input Waveform and Resultant LED Current
In this mode, the nINT pin functions as an input. It no longer
provides notification of the INT_STAT register.
AUTOMATED FADE-IN AND FADE-OUT
The LED drivers are easily configured for automated fade-in
and fade-out. Sixteen fade-in and fade-out rates can be selected
via the I2C interface. Fade-in and fade-out rates range from
0.0 sec to 1.75 sec (per full-scale current). Separate fade times are
assigned to the backlight LEDs and the ISC LEDs (see the LED
Groups section). The BLOFF_INT bit in Register 0x02 can be used
to flag the interrupt pin when an automated backlight fade-out has
occurred.
Data Sheet ADP8866
Rev. B | Page 15 of 52
The fade profile is based on the transfer law selected (square,
Cubic 10, or Cubic 11) and the delta between the actual current
and the target current. Smaller changes in current reduce the
fade time. For square law fades, the fade time is given by
Fade Time = Fade Rate × (Code/127) (4)
where the Fade Rate is shown in Table 6.
Table 6. Available Fade-In and Fade-Out Times
Code Fade Rate (Seconds per 128 Codes)
0000 0.0
0001 0.05
0010 0.10
0011 0.15
0100 0.20
0101 0.25
0110 0.30
0111 0.35
1000 0.40
1001 0.45
1010 0.50
1011 0.75
1100 1.0
1101 1.25
1110 1.50
1111 1.75
The Cubic 10 and Cubic 11 laws also use the square backlight
currents in Equation 3; however, the time between each step is
varied to produce a steeper slope at higher currents and a
shallower slope at lighter currents (see Figure 32).
30
0
5
10
15
20
25
01.000.750.500.25
CURRENT (mA)
UNIT FADE TIME
SQUARE
CUBIC 11
CUBIC 10
09478-033
Figure 32. Comparison of the Dimming Transfers Law 25 mA Scale Shown
CABC FADE DISABLE
The fade settings applied to the backlight in Register 0x12 are
also used when the BLMX (Register 0x13) current is changed.
This provides a smooth transition to new backlight current
levels.
However, in some modes of operation, this feature is not
desired. For example, during cABC (content adjustable
brightness control) operation, the BLMX register is updated as
often as 60 times per second. And the changes to BLMX must
be implemented as soon as possible. Therefore, the ADP8866
has a unique mode that allows the backlight to have very fast
changes after the initial ramp in and ramp out. This mode is
entered when CABCFADE in Register 0x10 is set high.
In this mode, the backlight fades in when BL_EN and nSTBY in
Register 0x01 are set high, and it fades out when BL_EN or
nSTBY is set low. However, after the fade-in is complete, any
changes to the BLMX register result in near instantaneous
changes to the backlight current. The situation is illustrated in
Figure 33.
09478-034
BACKLIGHT CURRENT
CABCFADE = 0 (DEFAULT)
BL EN = 1 BL EN = 0
TIME
FADE IN
COMPLETE
CHANGE
BL SETTING
CHANGE
BL SETTING
CABCFADE = 1
Figure 33. Effect of the CABCFADE Bit
INDEPENDENT SINK CONTROL (ISC)
Each of the nine LEDs can be configured (in Register 0x10 and
Register 0x11) to operate as either part of the backlight or an
independent sink current (ISC). Each ISC can be enabled
independently and has its own current level. All ISCs share the
same fade-in rates, fade-out rates, and fade law.
The ISCs have additional timers to facilitate blinking functions.
A shared on timer (SCON), used in conjunction with the off
timers of each ISC (SC1OFF, SC2OFF, SC3OFF, SC4OFF,
SC5OFF, SC6OFF, and SC7OFF; see Register 0x1C through
Register 0x21) allow the LED current sinks to be configured in
various blinking modes. The on and off times are listed in the
Register Descriptions section. Blink mode is activated by setting
the off timers to any setting other than disabled.
MAX
SCx_EN
SCx
CURRENT
FADE-IN FADE-OUT FADE-IN FADE-OUT
ON TIME ON TIME
OFF
TIME
OFF
TIME
SET BY USER
09478-035
Figure 34. LEDx Blink Mode with Fading
ADP8866 Data Sheet
Rev. B | Page 16 of 52
Program all fade-in and fade-out timers before enabling any of
the LED current sinks. If ISCx is on during a blink cycle and
SCx_EN in Register 0x1B is cleared, it turns off (or fades to off
if fade-out is enabled). If ISCx is off during a blink cycle and
SCx_EN is cleared, it stays off.
ADVANCED BLINKING CONTROLS
Diode D1 to Diode D5 have basic blinking controls, while
Channel D6 to Channel D9 have much more advanced
capabilities. These advanced features include
• Programmable delays: Register 0x3C to Register 0x3F set
the individual delays for D6 to D9. Delays are activated
when the individual diode is enabled. Delay times range
from 0 sec to 1.270 sec in 10 ms increments.
• Additional off time selections: D6 to D9 off times that
range from 0 sec to 12.5 sec in 100 ms increments (Register
0x1E to Register 0x21). The off times can also be set to off,
which turns the channel off at the completion of the blink
cycle. The LED turns on again when the enable signal is
toggled.
• Heartbeat mode: This mode allows a double pulse to be
issued in a fully automated and customizable loop. Register
0x2C through Register 0x35 control the heartbeat effect.
Up to four channels (D6 to D9) can be configured to
operate in the heartbeat mode. The approximate shape of
the heartbeat is shown in Figure 35:
09478-036
EN
SCFI
ISCx CURRENT
ISCx_HB CURRENT
SCFO SCFI SCFO
EVEN PULSE
OFFTIMERx
0 TO 126 SEC
SCON
0 TO 750ms
SCON_HB
0 TO 750ms
OFFTIMERx_HB
0 TO 126 SEC
CURRENT (mA)
EVEN PULSE
ODD PULSEODD PULSE
Figure 35. Customizable Heartbeat Pulse
Data Sheet ADP8866
Rev. B | Page 17 of 52
SHORT-CIRCUIT PROTECTION (SCP) MODE
The ADP8866 can protect against short circuits on the output
(VOUT). Short-circuit protection (SCP) is activated at the point
when VOUT < 55% of VIN. Note that this SCP sensing is disabled
during startup and restart attempts (fault recovery). SCP
sensing is reenabled 4 ms (typical) after activation. During a
short-circuit fault, the device enters a low current consumption
state and an interrupt flag is set. The device can be restarted at
any time after receiving a short-circuit fault by simply rewriting
nSTBY = 1 in Register 0x01. It then repeats another complete
soft start sequence. Note that the value of the output
capacitance (COUT) should be small enough to allow VOUT to
reach approximately 55% (typical) of VIN within the 4 ms
(typical) time. If COUT is too large, the device inadvertently
enters short-circuit protection.
OVERVOLTAGE PROTECTION (OVP)
Overvoltage protection is implemented on the VOUT pin.
There are two types of overvoltage events: normal (no fault) and
abnormal.
Normal (No Fault) Overvoltage
In this case, the VOUT pin voltage approaches VOUT(REG) (4.9 V
typical) during normal operation. This is not caused by a fault
or load change but is simply a consequence of the input voltage
times the gain reaching the clamped output voltage VOUT(REG). To
prevent this, the ADP8866 detects when the output voltage rises
to VOUT(REG). It then increases the effective ROUT of the gain stage
to reduce the voltage that is delivered. This effectively regulates
VOUT to VOUT(REG); however, there is a limit to the effect that this
system can have on regulating VOUT. It is designed only for
normal operation and is not intended to protect against faults or
sudden load changes. During this mode, no interrupt is set, and
the operation is transparent to the LEDs and overall application.
The automatic gain selection equations take into account the
additional drop within ROUT to maintain optimum efficiency.
Abnormal (Fault/Sudden Load Change) Overvoltage
Because of the open loop behavior of the charge pump, as well
as how the gain transitions are computed, a sudden load change
or fault can abnormally force VOUT beyond 6 V. If the event
happens slowly enough, the system first tries to regulate the
output to 4.9 V as in a normal overvoltage scenario. However, if
this is not sufficient, or if the event happens too quickly, the
ADP8866 enters overvoltage protection mode when VOUT
exceeds the OVP threshold (typically 5.7 V). In this mode, only
the charge pump is disabled to prevent VOUT from rising too
high. The current sources and all other device functionality
remain intact. When the output voltage falls by about 500 mV
(to 5.2 V typical), the charge pump resumes operation. If the
fault or load step recurs, the process may repeat. An interrupt
flag is set at each OVP instance.
THERMAL SHUTDOWN
(TSD)/OVERTEMPERATURE PROTECTION
If the die temperature of the ADP8866 rises above a safety limit
(150°C typical), the controllers enter TSD protection mode. In
this mode, most of the internal functions are shut down, the
part enters standby, and the TSD_INT interrupt is set (see
Register 0x02). When the die temperature decreases below
~130°C, the part is allowed to be restarted. To restart the part,
simply remove it from standby. No interrupt is generated when
the die temperature falls below 130°C. However, if the software
clears the pending TSD_INT interrupt and the temperature
remains above 130°C, another interrupt is generated.
The complete state machine for these faults (SCP, OVP, and
TSD) is shown in Figure 36.
ADP8866 Data Sheet
Rev. B | Page 18 of 52
WAIT
100µs (TYP)
G = 2
G = 1.5
0
0
1
1
1
1
0
V
OUT
> V
OUT(REG)
TRY TO
REGULATE
VOUT TO
V
OUT(REG)
VOUT > V
OVP
OVP FAULT
VOUT < V
OVP
–
V
OVP
(HYS)
0
1
0
1
1
0
VOUT > V
OVP
OVP FAULT
0
1
0
1
1
0
EXIT
STARTUP
G = 1
STANDBY
1
0
VOUT < V
OUT(SC)
0
SCP FAULT
EXIT STANDBY
STARTUP:
CHARGE
V
IN
TO V
OUT
V
OUT
> V
OUT(START)
DIE TEMP > TSD
0
TSD FAULT
DIE TEMP <
TSD – TSD
(HYS)
MIN (V
D1:D9
)
< V
HR(UP)
MIN (V
D1:D9
)
< V
HR(UP)
MIN (V
D1:D9
)
> V
DMAX
MIN (V
D1:D9
)
> V
DMAX
1
0
EXIT STANDBY
WAIT
100µs (TYP)
WAIT
100µs (TYP)
VOUT < V
OVP
–
V
OVP (HYS)
V
OUT
> V
OUT(REG)
TRY TO
REGULATE
VOUT TO
V
OUT(REG)
NOTES
1. V
DMAX
IS THE CALCULATED GAIN DOWN TRANSITION POINT.
09478-037
1
0
Figure 36. Fault State Machine
Data Sheet ADP8866
Rev. B | Page 19 of 52
INTERRUPTS
There are four interrupt sources available on the ADP8866.
Independent sink off: when all independent sinks that are
assigned with the DxOFFINT bits high in Register 0x04
and Register 0x05 have faded to off, this interrupt
(ISCOFF_INT, Register 0x02) is set.
Backlight off: at the end of each automated backlight fade-
out, this interrupt (BLOFF_INT, Register 0x02) is set.
Overvoltage protection: OVP_INT (see Register 0x02) is
generated when the output voltage exceeds 5.7 V (typical).
Thermal shutdown circuit: an interrupt (TSD_INT,
Register 0x02) is generated when entering
overtemperature protection.
Short-circuit detection: SHORT_INT (see Register 0x02) is
generated when the device enters short-circuit protection
mode.
The interrupt (if any) that appears on the nINT pin is
determined by the bits mapped in Register INT_EN, 0x03. To
clear an interrupt, write a 1 to the interrupt in the INT_STAT
register, 0x02, or reset the part.
BACKLIGHT OFF INTERRUPT
The backlight off interrupt (BLOFF_INT) is set when the
backlight completes a fade-out. This feature is useful to
synchronize the backlight turn off with the LCD display driver.
BL_EN = 1 BL_EN = 0
BLOFF_INT SET
BACKLIGHT CURRENT
MAX
FADE-IN
OFF-TO-MAX
FADE-OUT
MAX-TO-OFF
09478-038
Figure 37. Backlight Off Interrupt Timing Diagram
INDEPENDENT SINK OFF INTERRUPT
The independent sink off interrupt (ISCOFF_INT) is generated
when all the independent sinks assigned in Register 0x04 and
Register 0x05 have faded to off. This can happen during a
blinking profile (where SCxOFF does not equal disabled) or
when an ISC is disabled. Note that even with fade-out set to 0,
an ISCOFF_INT is still set.
SCx_EN = 1
SCxOFF
ISCOFF_INT SETISCOFF_INT SET
ISC CURRENT
FADE-IN FADE-OUT
SCON
09478-039
Figure 38. Independent Sink Off Interrupt Timing Diagram
ADP8866 Data Sheet
Rev. B | Page 20 of 52
APPLICATIONS INFORMATION
The ADP8866 allows the charge pump to operate efficiently
with a minimum of external components. Specifically, the user
must select an input capacitor (CIN), output capacitor (COUT),
and two charge pump fly capacitors (C1 and C2). CIN should be
1 F or greater. The value must be high enough to produce a
stable input voltage signal at the minimum input voltage and
maximum output load. A 1 F capacitor for COUT is recommended.
Larger values are permissible, but care must be exercised to ensure
that VOUT charges above 55% (typical) of VIN within 4 ms
(typical). See the Short-Circuit Protection (SCP) Mode section
for more detail.
For best practice, it is recommended that the two charge pump
fly capacitors be 1 F; larger values are not recommended and
smaller values may reduce the ability of the charge pump to
deliver maximum current. For optimal efficiency, the charge
pump fly capacitors should have low equivalent series resistance
(ESR). Low ESR X5R or X7R capacitors are recommended for
all four components. Minimum voltage ratings should adhere to
the guidelines in Table 7:
Table 7. Capacitor Stress in Each Charge Pump Gain State
Capacitor Gain = 1× Gain = 1.5× Gain = 2×
CIN (Input Capacitor) VIN VIN VIN
COUT (Output
Capacitor)
VIN VIN × 1.5
(Max of 5.5 V)
VIN × 2.0
(Max of 5.5 V)
C1 (Charge Pump
Capacitor)
None VIN ÷ 2 VIN
C2 (Charge Pump
Capacitor)
None VIN ÷ 2 VIN
Any color LED can be used provided that the Vf (forward
voltage) is less than 4.3 V. However, using lower Vf LEDs
reduces the input power consumption by allowing the charge
pump to operate at lower gain states.
The equivalent model for a charge pump is shown in Figure 39.
09478-040
V
DX
C
OUT
G × V
IN
R
OUT
V
OUT
I
OUT
Figure 39. Charge Pump Equivalent Circuit Model
The input voltage is multiplied by the gain (G) and delivered to
the output through an effective charge pump resistance (ROUT).
The output current flows through ROUT and produces an IR
drop, which yields
VOUT = G × VIN − IOUT × ROUT(G) (6)
The ROUT term is a combination of the RDSON resistance for the
switches used in the charge pump and a small resistance that
accounts for the effective dynamic charge pump resistance. The
ROUT level changes based upon the gain (the configuration of the
switches). Typical ROUT values are given in Table 1 and Figure 14
and Figure 16.
VOUT is also equal to the largest Vf of the LEDs used plus the
voltage drop across the regulating current source. This gives
VOUT = Vf(MAX) + VDX (7)
Combining Equation 6 and Equation 7 gives
VIN = (Vf(MAX) + VDX + IOUT × ROUT(G))/G (8)
This equation is useful for calculating approximate bounds for
the charge pump design.
Determining the Transition Point of the Charge Pump
Consider the following design example where:
Vf(MAX) = 3.7 V
IOUT = 140 mA (7 LEDs at 20 mA each)
ROUT(G = 1.5×) = 3 Ω (obtained from Figure 12)
At the point of a gain transition, VDX = VHR(UP). Table 1 gives the
typical value of VHR(UP) as 0.2 V. Therefore, the input voltage
level when the gain transitions from 1.5× to 2× is
VIN = (3.7 V + 0.2 V + 140 mA × 3 Ω)/1.5 = 2.88 V
LAYOUT GUIDELINES
For optimal noise immunity, place the CIN and COUT
capacitors as close to their respective pins as possible.
These capacitors should share a short ground trace. If the
LEDs are a significant distance from the VOUT pin,
another capacitor on VOUT, placed closer to the LEDs, is
advisable.
For optimal efficiency, place the charge pump fly capacitors
as close to the part as possible.
The ground pin should be connected at the ground for the
input and output capacitors. The LFCSP exposed pad must
be soldered at the board to the GND pin.
Unused diode pins [D1:D9] can be connected to ground or
VOUT or remain floating. However, the unused diode
current sinks must be removed from the charge pump gain
calculation by setting the appropriate DxPWR bits high in
Register 0x09 and Register 0x0A.
If the interrupt pin (nINT) is not used, connect it to
ground or leave it floating. Never connect it to a voltage
supply, except through a ≥1 k series resistor.
The ADP8866 has an integrated noise filter on the nRST
pin. Under normal conditions, it is not necessary to filter
the reset line. However, if exposed to an unusually noisy
signal, it is beneficial to add a small RC filter or bypass
capacitor on this pin. If the nRST pin is not used, it must
be pulled well above the VIH(MAX) level (see Table 1). Do not
allow the nRST pin to float.
Data Sheet ADP8866
Rev. B | Page 21 of 52
I2C PROGRAMMING AND DIGITAL CONTROL
The ADP8866 provides full software programmability to
facilitate its adoption in various product architectures. The I2C
address is 0100111x (x = 0 during write, x = 1 during read).
Therefore, the write address is 0x4E, and the read address is
0x4F.
Notes on the general behavior of registers:
• All registers are set to default values on reset or in case of a
UVLO event.
• All registers are read/write unless otherwise specified
• Unused bits are read-as-zero.
Table 8 through Table 103 provide register and bit descriptions.
The reset value for all bits in the bit map tables is all 0s, except
in Table 9 (see Table 9 for its unique reset value). Wherever the
acronym N/A appears in the tables, it means not applicable.
ST ACK REGISTERADDRESS ACKREGISTERVALUEACK
0100111
START
DEVICE ID
FORWRITE
OPERATION
ST
B7B0B7B0 B7 B0
STOP
WRITE = 0
FROM ADP8866
FROM ADP8866
FROM ADP8866
SELECT REGISTERTO WRITE 8-BITVALUETOWRITE INTHE
ADDRESSEDREGISTER
SLAVE TOMASTER
MASTER TO SLAVE
09478-041
R/W
Figure 40. I2C Write Sequence
SLAVE TO MASTER
MASTER TO SLAVE
ST R/W ACK REGISTER ADDRESS ACK ACK REGISTER VALUE ACK010011 1
START
DEVICE ID
FOR WRITE
OPERATION
ST
B7 B0 B7 B0 B7 B0
STOP
WRITE = 0
FROM ADP8866
FROM ADP8866
FROM MASTER
SELECT REGISTER TO WRITE 8-BIT VALUE TO WRITE IN THE
ADDRESSED REGISTER
RS 01 0 0111
REPEATED START
DEVICE ID
FOR READ
OPERATION
B7 B0
READ = 1
09478-042
R/W
FROM ADP8866
Figure 41. I2C Read Sequence
ADP8866 Data Sheet
Rev. B | Page 22 of 52
REGISTER DESCRIPTIONS
Table 8. Register Map
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0x00 MFDVID Manufacture ID Device ID
0x01 MDCR Reserved INT_CFG NSTBY ALT_GSEL GDWN_DIS SIS_EN Reserved BL_EN
0x02 INT_STAT Reserved ISCOFF_INT BLOFF_INT SHORT_INT TSD_INT OVP_INT Reserved Reserved
0x03 INT_EN Reserved ISCOFF_IEN BLOFF_IEN SHORT_IEN TSD_IEN OVP_IEN Reserved Reserved
0x04 ISCOFF_SEL1 Reserved D9OFFINT
0x05 ISCOFF_SEL2 D8OFFINT D7OFFINT D6OFFINT D5OFFINT D4OFFINT D3OFFINT D2OFFINT D1OFFINT
0x06 GAIN_SEL Reserved 1.5X_LIMIT G_FORCE
0x07 LVL_SEL1 Reserved D9LVL LEVEL_SET
0x08
LVL_SEL2
D8LVL
D7LVL
D6LVL
D5LVL
D4LVL
D3LVL
D2LVL
D1LVL
0x09 PWR_SEL1 Reserved D9PWR
0x0A PWR_SEL2 D8PWR D7PWR D6PWR D5PWR D4PWR D3PWR D2PWR D1PWR
0x0B to 0x0F Reserved Reserved
0x10 CFGR Reserved D9SEL CABCFADE BL_LAW Reserved
0x11 BLSEL D8SEL D7SEL D6SEL D5SEL D4SEL D3SEL D2SEL D1SEL
0x12 BLFR BL_FO BL_FI
0x13 BLMX Reserved BL_MC
0x14 to 0x19 Reserved Reserved
0x1A ISCC1 Reserved SC9_EN SC_LAW
0x1B ISCC2 SC8_EN SC7_EN SC6_EN SC5_EN SC4_EN SC3_EN SC2_EN SC1_EN
0x1C ISCT1 SCON Reserved SC5OFF
0x1D ISCT2 SC4OFF SC3OFF SC2OFF SC1OFF
0x1E OFFTIMER6 Reserved SC6OFF
0x1F OFFTIMER7 Reserved SC7OFF
0x20 OFFTIMER8 Reserved SC8OFF
0x21 OFFTIMER9 Reserved SC9OFF
0x22 ISCF SCFO SCFI
0x23 ISC1 Reserved SCD1
0x24 ISC2 Reserved SCD2
0x25
ISC3
Reserved
SCD3
0x26 ISC4 Reserved SCD4
0x27 ISC5 Reserved SCD5
0x28 ISC6 Reserved SCD6
0x29 ISC7 Reserved SCD7
0x2A ISC8 Reserved SCD8
0x2B ISC9 Reserved SCD9
0x2C HB_SEL Reserved D9HB_EN D8HB_EN D7HB_EN D6HB_EN
0x2D ISC6_HB Reserved SCD6_HB
0x2E
ISC7_HB
Reserved
SCD7_HB
0x2F ISC8_HB Reserved SCD8_HB
0x30
ISC9_HB
Reserved
SCD9_HB
0x31 OFFTIMER6_HB Reserved SC6OFF_HB
0x32 OFFTIMER7_HB Reserved SC7OFF_HB
0x33 OFFTIMER8_HB Reserved SC8OFF_HB
0x34 OFFTIMER9_HB Reserved SC9OFF_HB
0x35 ISCT_HB Reserved SCON_HB
0x36 to 0x3B Reserved Reserved
0x3C DELAY6 Reserved DELAY6
0x3D DELAY7 Reserved DELAY7
0x3E DELAY8 Reserved DELAY8
0x3F DELAY9 Reserved DELAY9
Data Sheet ADP8866
Rev. B | Page 23 of 52
Manufacturer and Device ID (MFDVID)—Register 0x00
Multiple device revisions are tracked by the device ID field. This is a read-only register.
Table 9. MFDVID Manufacturer and Device ID Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Manufacture ID Device ID
0 1 0 1 0 0 1 1
Mode Control Register (MDCR)—Register 0x01
Table 10. MDCR Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved INT_CFG NSTBY ALT_GSEL GDWN_DIS SIS_EN Reserved BL_EN
Table 11.
Bit Name Bit No. Description
N/A 7 Reserved.
INT_CFG 6 Interrupt configuration.
1 = processor interrupt deasserts for 50 μs and reasserts with pending events.
0 = processor interrupt remains asserted if the host tries to clear the interrupt while there is a pending event.
NSTBY
5
1 = device is in normal mode.
0 = device is in standby, only I2C is enabled.
ALT_GSEL 4 1 = charge pump gain is automatically set to 1× every time that the BLMX (Register 0x13) is written to.
0 = writing to BLMX (Register 13) has no unique effect on the charge pump gain.
GDWN_DIS 3 1 = the charge pump does not switch down in gain until all LEDs are off. The charge pump switches up in gain
as needed. This feature is useful if the ADP8866 charge pump is used to drive an external load.
0 = the charge pump automatically switches up and down in gain. This provides optimal efficiency but is not
suitable for driving external loads (other than those connected to the ADP8866 diode drivers).
SIS_EN 2 Master enable for independent sinks.
1 = enables all LED current sinks designated as independent sinks. This bit has no effect if any of the SCx_EN
bits that are part of the independent sinks group in Register 0x1A and Register 0x1B are set.
0 = disables all sinks designated as independent sinks. This bit has no effect if any of the SCx_EN bits that are
part of the independent sinks group in Register 0x1A and Register 0x1B are set.
N/A 1 Reserved.
BL_EN
0
Master enable for backlight sinks.
1 = enables all LED current sinks designated as backlight.
0 = disables all sinks designated as backlight.
ADP8866 Data Sheet
Rev. B | Page 24 of 52
Interrupt Status Register (INT_STAT)—Register 0x02
Table 12. INT_STAT Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved ISCOFF_INT BLOFF_INT SHORT_INT TSD_INT OVP_INT Reserved
Table 13.
Bit Name Bit No. Description1
N/A 7 Reserved.
ISCOFF_INT 6 Independent sink off.
1 = indicates that the controller has ramped all the independent sinks designated in Register 0x04 and
Register 0x05 to off.
0 = the controller has not ramped all designated independent sinks to off.
BLOFF_INT 5 Backlight off.
1 = indicates that the controller has faded the backlight sinks to off.
0 = the controller has not completed fading the backlight sinks to off.
SHORT_INT 4
Short-circuit error.
1 = a short-circuit or overload condition on VOUT or current sinks was detected.
0 = no short-circuit or overload condition was detected.
TSD_INT 3 Thermal shutdown.
1 = device temperature is too high and has been shut down.
0 = no overtemperature condition was detected.
OVP_INT 2 Overvoltage interrupt.
1 = charge-pump output voltage has exceeded VOVP.
0 = charge-pump output voltage has not exceeded VOVP.
N/A
[1:0]
Reserved.
1 Interrupt bits are cleared by writing a 1 to the flag; writing a 0 or reading the flag has no effect.
Interrupt Enable (INT_EN)—Register 0x03
Table 14. INT_EN Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved ISCOFF_IEN BLOFF_IEN SHORT_IEN TSD_IEN OVP_IEN Reserved
Table 15.
Bit Name Bit No. Description
N/A 7 Reserved.
ISCOFF_IEN 6 Automated ISC off indicator.
1 = the automated independent sink off indicator is enabled.
0 = the automated independent sink off indicator is disabled.
BLOFF_IEN 5 Automated backlight off indicator.
1 = the automated backlight off indicator is enabled.
0 = the automated backlight off indicator is disabled.
When this bit is set, an INT is generated anytime that a backlight fade-out is over. This occurs after an automated
fade-out or after the completion of a backlight dimming profile. This is useful to synchronize the complete turn off
for the backlights with other devices in the application.
SHORT_IEN 4 Short-circuit interrupt enabled. When the SHORT_INT status bit is set after an error condition, an interrupt is raised
to the host if the SHORT_IEN flag is enabled.
1 = the short-circuit interrupt is enabled.
0 = the short-circuit interrupt is disabled (SHORT_INT flag is still asserted).
TSD_IEN 3 Thermal shutdown interrupt enabled. When the TSD_INT status bit is set after an error condition, an interrupt is
raised to the host if the TSD_IEN flag is enabled.
1 = the thermal shutdown interrupt is enabled.
0 = the thermal shutdown interrupt is disabled (TSD_INT flag is still asserted).
Data Sheet ADP8866
Rev. B | Page 25 of 52
Bit Name Bit No. Description
OVP_IEN 2 Overvoltage interrupt enabled. When the OVP_INT status bit is set after an error condition, an interrupt is raised to
the host if the OVP_IEN flag is enabled.
1 = the overvoltage interrupt is enabled.
0 = the overvoltage interrupt is disabled (OVP_INT flag is still asserted).
N/A [1:0] Reserved.
Independent Sink Interrupt Selection 1 (ISCOFF_SEL1)—Register 0x04
Table 16. ISCOFF_SEL1 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved D9OFFINT
Table 17.
Bit Name Bit No. Description
N/A [7:1] Reserved.
D9OFFINT
0
Include Diode 9 in the ISCOFF_INT flag.
1 = Diode 9 is in the group which triggers an ISCOFF_INT. When Diode 9 and all other LEDs with
DxOFFINT are set high and go from on to off, ISCOFF_INT is set.
0 = Diode 9 is not in the group which triggers an ISCOFF_INT when all diodes in that group are off.
Independent Sink Interrupt Selection 2 (ISCOFF_SEL2)—Register 0x05
Table 18. ISCOFF_SEL2 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
D8OFFINT D7OFFINT D6OFFINT D5OFFINT D4OFFINT D3OFFINT D2OFFINT D1OFFINT
Table 19.
Bit Name Bit No. Description
D8OFFINT 7 Include Diode 8 in the ISCOFF_INT flag.
1 = Diode 8 is in the group that triggers an ISCOFF_INT. When Diode 8 and all other LEDs with
DxOFFINT are set high and goes from on to off, ISCOFF_INT is set.
0 = Diode 8 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off.
D7OFFINT 6 Include Diode 7 in the ISCOFF_INT flag.
1 = Diode 7 is in the group that triggers an ISCOFF_INT. When Diode 7 and all other LEDs with
DxOFFINT are set high and goes from on to off, ISCOFF_INT is set.
0 = Diode 7 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off.
D6OFFINT 5 Include Diode 6 in the ISCOFF_INT flag.
1 = Diode 6 is in the group that triggers an ISCOFF_INT. When Diode 6 and all other LEDs with
DxOFFINT are set high and goes from on to off, ISCOFF_INT is set.
0 = Diode 6 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off.
D5OFFINT 4 Include Diode 5 in the ISCOFF_INT flag.
1 = Diode 5 is in the group that triggers an ISCOFF_INT. When Diode 5 and all other LEDs with
DxOFFINT are set high and goes from on to off, ISCOFF_INT is set.
0 = Diode 5 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off.
D4OFFINT 3 Include Diode 4 in the ISCOFF_INT flag.
1 = Diode 4 is in the group that triggers an ISCOFF_INT. When Diode 4 and all other LEDs with
DxOFFINT are set high and goes from on to off, ISCOFF_INT is set.
0 = Diode 4 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off.
D3OFFINT 2 Include Diode 3 in the ISCOFF_INT flag.
1 = Diode 3 is in the group that triggers an ISCOFF_INT. When Diode 3 and all other LEDs with
DxOFFINT are set high and goes from on to off, ISCOFF_INT is set.
0 = Diode 3 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off.
ADP8866 Data Sheet
Rev. B | Page 26 of 52
Bit Name Bit No. Description
D2OFFINT 1 Include Diode 2 in the ISCOFF_INT flag.
1 = Diode 2 is in the group that triggers an ISCOFF_INT. When Diode 2 and all other LEDs with
DxOFFINT are set high and goes from on to off, ISCOFF_INT is set.
0 = Diode 2 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off.
D1OFFINT 0 Include Diode 1 in the ISCOFF_INT flag.
1 = Diode 1 is in the group that triggers an ISCOFF_INT. When Diode 1 and all other LEDs with
DxOFFINT are set high and goes from on to off, ISCOFF_INT is set.
0 = Diode 1 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off.
Charge Pump Gain Selection (GAIN_SEL)—Register 0x06
Table 20. GAIN_SEL Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved 1.5X_LIMIT G_FORCE
Table 21.
Bit Name
Bit No.
Description
N/A 7:3 Reserved.
1.5X_LIMIT 2 1 = gain is allowed to transition up from 1× to 1.5×. The gain is never allowed to enter 2× mode.
0 = gain is allowed to transition up from 1× to 1.5× to 2× as needed.
G_FORCE [1:0] Selects desired gain state.
00 = auto gain select.
01 = gain is locked into 1× mode.
10 = gain is locked into 1.5× mode.
11 = gain is locked into 2× mode (if 1.5X_LIMIT = 1, gain is locked into 1.5×)
Output Level Selection 1 (LVL_SEL1)—Register 0x07
Table 22. LVL_SEL1 Bit Map
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reserved D9LVL LEVEL_SET
Table 23.
Bit Name Bit No. Description
N/A 7 Reserved.
D9LVL 6 Diode 9 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
LEVEL_SET [5:0] Output level selection. Sets the mode of operation for all DxLVL bits that are set high.
Code N Maximum Current Range
000000 0.8 25 mA ÷ N = 31.3 mA
000001 0.9 25 mA ÷ N = 27.8 mA
000010 1.0 25 mA ÷ N = 25.0 mA
000011 1.1 25 mA ÷ N = 22.7 mA
… … …
111110
7.0
25 mA ÷ N = 3.6 mA
111111 1.0 PWM current. In this mode, the INT pin functions as a PWM input and directly drives
the selected outputs.
Data Sheet ADP8866
Rev. B | Page 27 of 52
Table 24.
Code N Maximum Current Range (mA) Code N Maximum Current Range (mA)
000000 0.8 31.3 100000 4 6.25
000001 0.9 27.8 100001 4.1 6.10
000010 1 25.0 100010 4.2 5.95
000011 1.1 22.7 100011 4.3 5.81
000100 1.2 20.8 100100 4.4 5.68
000101 1.3 19.2 100101 4.5 5.56
000110 1.4 17.9 100110 4.6 5.43
000111 1.5 16.7 100111 4.7 5.32
001000 1.6 15.6 101000 4.8 5.21
001001
1.7
14.7
101001
4.9
5.10
001010 1.8 13.9 101010 5 5.00
001011 1.9 13.2 101011 5.1 4.90
001100 2 12.5 101100 5.2 4.81
001101 2.1 11.9 101101 5.3 4.72
001110 2.2 11.4 101110 5.4 4.63
001111 2.3 10.9 101111 5.5 4.55
010000 2.4 10.4 110000 5.6 4.46
010001 2.5 10.0 110001 5.7 4.39
010010 2.6 9.62 110010 5.8 4.31
010011 2.7 9.26 110011 5.9 4.24
010100
2.8
8.93
110100
6
4.17
010101 2.9 8.62 110101 6.1 4.10
010110 3 8.33 110110 6.2 4.03
010111 3.1 8.06 110111 6.3 3.97
011000 3.2 7.81 111000 6.4 3.91
011001 3.3 7.58 111001 6.5 3.85
011010
3.4
7.35
111010
6.6
3.79
011011 3.5 7.14 111011 6.7 3.73
011100 3.6 6.94 111100 6.8 3.68
011101 3.7 6.76 111101 6.9 3.62
011110 3.8 6.58 111110 7.0 3.57
011111 3.9 6.41 111111 1.0 PWM current
Output Level Selection 2 (LVL_SEL2)—Register 0x08
Table 25. LVL_SEL2 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
D8LVL D7LVL D6LVL D5LVL D4LVL D3LVL D2LVL D1LVL
Table 26.
Bit Name Bit No. Description
D8LVL 7 Diode 8 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
D7LVL 6 Diode 7 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
D6LVL 5 Diode 6 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
ADP8866 Data Sheet
Rev. B | Page 28 of 52
Bit Name Bit No. Description
D5LVL 4 Diode 5 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
D4LVL 3 Diode 4 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
D3LVL 2 Diode 3 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
D2LVL 1 Diode 2 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
D1LVL 0 Diode 1 level select.
1 = control with the LEVEL_SET bits.
0 = normal mode (25 mA full-scale current).
LED Power Source Selection 1 (PWR_SEL1)—Register 0x09
Table 27. PWR_SEL1 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved D9PWR
Table 28.
Bit Name Bit No. Description
N/A [7:1] Reserved.
D9PWR 0 Diode 9 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
LED Power Source Selection 2 (PWR_SEL2)—Register 0x0A
Table 29. PWR_SEL2 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
D8PWR D7PWR D6PWR D5PWR D4PWR D3PWR D2PWR D1PWR
Table 30.
Bit Name Bit No. Description
D8PWR 7 Diode 8 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
D7PWR 6 Diode 7 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
D6PWR 5 Diode 6 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
D5PWR 4 Diode 5 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
D4PWR 3 Diode 4 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
Data Sheet ADP8866
Rev. B | Page 29 of 52
Bit Name Bit No. Description
D3PWR 2 Diode 3 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
D2PWR 1 Diode 2 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
D1PWR 0 Diode 1 LED power source select.
1 = the LED is powered from the battery or other power source.
0 = the LED is powered from the charge pump.
BACKLIGHT REGISTER DESCRIPTIONS
Configuration Register (CFGR)—Register 0x10
Table 31. CFGR Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved D9SEL CABCFADE BL_LAW Reserved
Table 32.
Bit Name Bit No. Description
N/A [7:5] Reserved.
D9SEL 4 Diode 9 backlight select.
1 = selects LED9 as part of the independent sinks group.
0 = selects LED9 as part of the backlight group.
CABCFADE 3 Selects how the backlight current responds to changes in its I2C setpoint after the backlight is enabled and the fade-
in is complete.
1 = any changes to the backlight current setting (Register 0x13) result in a near instant transition to the new current
level. This is useful when rapid changes to the backlight current are required, such as during cABC control.
0 = any changes to the backlight current setting (Register 0x13) result in a fade to the new current level. The fade
time is determined by the fade rate (set in Register 0x12) and the delta between the old and new current level.
BL_LAW [2:1] Backlight transfer law.
00 = square law DAC, linear time steps.
01 = square law DAC, linear time steps.
10 = square law DAC, nonlinear time steps (Cubic 10).
11 = square law DAC, nonlinear time steps (Cubic 11).
N/A 0 Reserved.
Backlight Select (BLSEL)—Register 0x11
Table 33. BLSEL Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
D8SEL D7SEL D6SEL D5SEL D4SEL D3SEL D2SEL D1SEL
Table 34.
Bit Name Bit No. Description
D8SEL 7 Diode 8 backlight select.
1 = selects LED8 as part of the independent sinks group.
0 = selects LED8 as part of the backlight group.
D7SEL 6 Diode 7 backlight select.
1 = selects LED7 as part of the independent sinks group.
0 = selects LED7 as part of the backlight group.
D6SEL 5 Diode 6 backlight select.
1 = selects LED6 as part of the independent sinks group.
0 = selects LED6 as part of the backlight group.
ADP8866 Data Sheet
Rev. B | Page 30 of 52
Bit Name Bit No. Description
D5SEL 4 Diode 5 backlight select.
1 = selects LED5 as part of the independent sinks group.
0 = selects LED5 as part of the backlight group.
D4SEL 3 Diode 4 backlight select.
1 = selects LED4 as part of the independent sinks group.
0 = selects LED4 as part of the backlight group.
D3SEL 2 Diode 3 backlight select.
1 = selects LED3 as part of the independent sinks group.
0 = selects LED3 as part of the backlight group.
D2SEL 1 Diode 2 backlight select.
1 = selects LED2 as part of the independent sinks group.
0 = selects LED2 as part of the backlight group.
D1SEL 0 Diode 1 backlight select.
1 = selects LED1 as part of the independent sinks group.
0 = selects LED1 as part of the backlight group.
Backlight Fade (BLFR)—Register 0x12
Table 35. BLFR Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
BL_FO BL_FI
Table 36.
Bit Name Bit No. Description
BL_FO [7:4] Backlight fade-out rate. The backlight fades from its current value to the off value. The times listed for BL_FO
are for a full-scale fade-out. Fades between closer current values reduce the fade time. See the Automated
Fade-in and Fade-Out section for more information.
0000 = 0.0 sec (fade-out disabled).
0001 = 0.05 sec.
0010 = 0.10 sec.
0011 = 0.15 sec.
0100 = 0.20 sec.
0101 = 0.25 sec.
0110 = 0.30 sec.
0111 = 0.35 sec.
1000 = 0.40 sec.
1001 = 0.45 sec.
1010 = 0.50 sec.
1011 = 0.75 sec.
1100 = 1.00 sec.
1101 = 1.25 sec.
1110 = 1.50 sec.
1111 = 1.75 sec.
BL_FI [3:0] Backlight fade-in rate. The backlight fades from 0 to its programmed value when the backlight is turned on.
The times listed for BL_FI are for a full-scale fade-in. Fades between closer current values reduce the fade time.
See the Automated Fade-in and Fade-Out section for more information.
0000 = 0.0 sec (fade-in disabled).
0001 = 0.05 sec.
0010 = 0.10 sec.
0011 = 0.15 sec.
…
1111 = 1.75 sec.
Data Sheet ADP8866
Rev. B | Page 31 of 52
Backlight Maximum Current Register (BLMX)—Register 0x13
Table 37. BLMX Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved BL_MC
Table 38.
Bit Name Bit No. Description
N/A 7 Reserved.
BL_MC [6:0] Backlight maximum current. The backlight maximum current can be set according to the square law function. All
values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale =
25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Table 39. Diode Output Currents per DAC Code
DAC Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale = 12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale = 8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale = 6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale = 5.0 mA)
LEVEL_SET = 101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
0x04 0.025 0.012 0.0083 0.0062 0.0050
0x05 0.039 0.019 0.013 0.010 0.0078
0x06 0.056 0.028 0.019 0.014 0.011
0x07
0.076
0.038
0.025
0.019
0.015
0x08 0.099 0.050 0.033 0.025 0.020
0x09 0.126 0.063 0.042 0.031 0.025
0x0A 0.155 0.078 0.052 0.039 0.031
0x0B 0.188 0.094 0.063 0.047 0.038
0x0C 0.223 0.112 0.074 0.056 0.045
0x0D 0.262 0.131 0.087 0.065 0.052
0x0E 0.304 0.152 0.101 0.076 0.061
0x0F 0.349 0.174 0.116 0.087 0.070
0x10 0.397 0.198 0.132 0.099 0.079
0x11 0.448 0.224 0.149 0.112 0.090
0x12 0.502 0.251 0.167 0.126 0.100
0x13 0.560 0.280 0.187 0.140 0.112
0x14 0.620 0.310 0.207 0.155 0.124
0x15 0.684 0.342 0.228 0.171 0.137
0x16 0.750 0.375 0.250 0.188 0.150
0x17 0.820 0.410 0.273 0.205 0.164
0x18
0.893
0.446
0.298
0.223
0.179
0x19 0.969 0.484 0.323 0.242 0.194
0x1A 1.05 0.524 0.349 0.262 0.210
0x1B 1.13 0.565 0.377 0.282 0.226
0x1C 1.22 0.608 0.405 0.304 0.243
ADP8866 Data Sheet
Rev. B | Page 32 of 52
DAC Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale = 12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale = 8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale = 6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale = 5.0 mA)
LEVEL_SET = 101010
0x1D 1.30 0.652 0.435 0.326 0.261
0x1E 1.40 0.698 0.465 0.349 0.279
0x1F 1.49 0.745 0.497 0.372 0.298
0x20 1.59 0.794 0.529 0.397 0.317
0x21 1.69 0.844 0.563 0.422 0.338
0x22 1.79 0.896 0.597 0.448 0.358
0x23
1.90
0.949
0.633
0.475
0.380
0x24 2.01 1.00 0.670 0.502 0.402
0x25 2.12 1.06 0.707 0.530 0.424
0x26 2.24 1.12 0.746 0.560 0.448
0x27 2.36 1.18 0.786 0.589 0.472
0x28 2.48 1.24 0.827 0.620 0.496
0x29 2.61 1.30 0.869 0.651 0.521
0x2A 2.73 1.37 0.911 0.684 0.547
0x2B 2.87 1.43 0.955 0.716 0.573
0x2C 3.00 1.50 1.00 0.750 0.600
0x2D 3.14 1.57 1.05 0.785 0.628
0x2E 3.28 1.64 1.09 0.820 0.656
0x2F 3.42 1.71 1.14 0.856 0.685
0x30 3.57 1.79 1.19 0.893 0.714
0x31 3.72 1.86 1.24 0.930 0.744
0x32 3.88 1.94 1.29 0.969 0.775
0x33 4.03 2.02 1.34 1.01 0.806
0x34
4.19
2.10
1.40
1.05
0.838
0x35 4.35 2.18 1.45 1.09 0.871
0x36 4.52 2.26 1.51 1.13 0.904
0x37 4.69 2.34 1.56 1.17 0.938
0x38 4.86 2.43 1.62 1.22 0.972
0x39 5.04 2.52 1.68 1.26 1.01
0x3A 5.21 2.61 1.74 1.30 1.04
0x3B 5.40 2.70 1.80 1.35 1.08
0x3C 5.58 2.79 1.86 1.40 1.12
0x3D 5.77 2.88 1.92 1.44 1.15
0x3E 5.96 2.98 1.99 1.49 1.19
0x3F 6.15 3.08 2.05 1.54 1.23
0x40 6.35 3.17 2.12 1.59 1.27
0x41 6.55 3.27 2.18 1.64 1.31
0x42 6.75 3.38 2.25 1.69 1.35
0x43 6.96 3.48 2.32 1.74 1.39
0x44 7.17 3.58 2.39 1.79 1.43
0x45
7.38
3.69
2.46
1.84
1.48
0x46 7.60 3.80 2.53 1.90 1.52
0x47 7.81 3.91 2.60 1.95 1.56
0x48 8.04 4.02 2.68 2.01 1.61
0x49 8.26 4.13 2.75 2.06 1.65
0x4A
8.49
4.24
2.83
2.12
1.70
0x4B 8.72 4.36 2.91 2.18 1.74
0x4C 8.95 4.48 2.98 2.24 1.79
0x4D 9.19 4.59 3.06 2.30 1.84
0x4E 9.43 4.72 3.14 2.36 1.89
0x4F 9.67 4.84 3.22 2.42 1.93
Data Sheet ADP8866
Rev. B | Page 33 of 52
DAC Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale = 12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale = 8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale = 6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale = 5.0 mA)
LEVEL_SET = 101010
0x50 9.92 4.96 3.31 2.48 1.98
0x51 10.2 5.08 3.39 2.54 2.03
0x52 10.4 5.21 3.47 2.61 2.08
0x53 10.7 5.34 3.56 2.67 2.14
0x54 10.9 5.47 3.65 2.73 2.19
0x55 11.2 5.60 3.73 2.80 2.24
0x56
11.5
5.73
3.82
2.87
2.29
0x57 11.7 5.87 3.91 2.93 2.35
0x58 12.0 6.00 4.00 3.00 2.40
0x59 12.3 6.14 4.09 3.07 2.46
0x5A 12.6 6.28 4.19 3.14 2.51
0x5B 12.8 6.42 4.28 3.21 2.57
0x5C 13.1 6.56 4.37 3.28 2.62
0x5D 13.4 6.70 4.47 3.35 2.68
0x5E 13.7 6.85 4.57 3.42 2.74
0x5F 14.0 6.99 4.66 3.50 2.80
0x60 14.3 7.14 4.76 3.57 2.86
0x61 14.6 7.29 4.86 3.65 2.92
0x62 14.9 7.44 4.96 3.72 2.98
0x63 15.2 7.60 5.06 3.80 3.04
0x64 15.5 7.75 5.17 3.88 3.10
0x65 15.8 7.91 5.27 3.95 3.16
0x66 16.1 8.06 5.38 4.03 3.23
0x67
16.4
8.22
5.48
4.11
3.29
0x68 16.8 8.38 5.59 4.19 3.35
0x69 17.1 8.54 5.70 4.27 3.42
0x6A 17.4 8.71 5.81 4.35 3.48
0x6B 17.7 8.87 5.92 4.44 3.55
0x6C 18.1 9.04 6.03 4.52 3.62
0x6D 18.4 9.21 6.14 4.60 3.68
0x6E 18.8 9.38 6.25 4.69 3.75
0x6F 19.1 9.55 6.37 4.77 3.82
0x70 19.4 9.72 6.48 4.86 3.89
0x71 19.8 9.90 6.60 4.95 3.96
0x72 20.1 10.1 6.71 5.04 4.03
0x73 20.5 10.2 6.83 5.12 4.10
0x74 20.9 10.4 6.95 5.21 4.17
0x75 21.2 10.6 7.07 5.30 4.24
0x76 21.6 10.8 7.19 5.40 4.32
0x77 21.9 11.0 7.32 5.49 4.39
0x78
22.3
11.2
7.44
5.58
4.46
0x79 22.7 11.3 7.56 5.67 4.54
0x7A 23.1 11.5 7.69 5.77 4.61
0x7B 23.4 11.7 7.82 5.86 4.69
0x7C 23.8 11.9 7.94 5.96 4.77
0x7D
24.2
12.1
8.07
6.05
4.84
0x7E 24.6 12.3 8.20 6.15 4.92
0x7F 25.0 12.5 8.33 6.25 5.00
ADP8866 Data Sheet
Rev. B | Page 34 of 52
INDEPENDENT SINK REGISTER DESCRIPTIONS
Independent Sink Current Control Register 1 (ISCC1)—Register 0x1A
Table 40. ISCLAW Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC9_EN SC_LAW
Table 41.
Bit Name Bit No. Description
N/A 7:3 Reserved.
SC9_EN 2 This enable acts on LED9.
1 = SC9 is turned on.
0 = SC9 is turned off.
SC_LAW 1:0 SC fade transfer law.
00 = square law DAC, linear time steps.
01 = square law DAC, linear time steps.
10 = square law DAC, nonlinear time steps (Cubic 10).
11 = square law DAC, nonlinear time steps (Cubic 11).
Independent Sink Current Control Register 2 (ISCC2)—Register 0x1B
Table 42. ISCC Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SC8_EN SC7_EN SC6_EN SC5_EN SC4_EN SC3_EN SC2_EN SC1_EN
Table 43.
Bit Name Bit No. Description
SC8_EN 7 This enable acts on LED8.
1 = SC8 is turned on.
0 = SC8 is turned off.
SC7_EN 6 This enable acts on LED7.
1 = SC7 is turned on.
0 = SC7 is turned off.
SC6_EN 5 This enable acts on LED6.
1 = SC6 is turned on.
0 = SC6 is turned off.
SC5_EN
4
This enable acts on LED5.
1 = SC5 is turned on.
0 = SC5 is turned off.
SC4_EN 3 This enable acts on LED4.
1 = SC4 is turned on.
0 = SC4 is turned off.
SC3_EN 2 This enable acts on LED3.
1 = SC3 is turned on.
0 = SC3 is turned off.
SC2_EN 1 This enable acts on LED2.
1 = SC2 is turned on.
0 = SC2 is turned off.
SC1_EN 0 This enable acts on LED1.
1 = SC1 is turned on.
0 = SC1 is turned off.
Data Sheet ADP8866
Rev. B | Page 35 of 52
Independent Sink Current Time (ISCT1)—Register 0x1C
Table 44. ISCT1 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SCON Reserved SC5OFF
Table 45.
Bit Name Bit No. Description
SCON [7:4] SC on time. If the SCxOFF time is not disabled, then when the independent current sink is enabled (Register 0x1A
and Register 0x1B), it remains on for the on time selected (per the following list) and then turns off.
0000 = 0.00 sec1.
0001 = 0.05 sec.
0010 = 0.10 sec.
0011 = 0.15 sec.
0100 = 0.20 sec.
0101 = 0.25 sec.
0110 = 0.30 sec.
0111 = 0.35 sec.
1000 = 0.40 sec.
1001 = 0.45 sec.
1010 = 0.50 sec.
1011 = 0.55 sec.
1100 = 0.60 sec.
1101 = 0.65 sec.
1110 = 0.70 sec.
1111 = 0.75 sec.
N/A [3:2] Reserved.
SC5OFF [1:0] SC5 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to any
other value, the ISC turns off for the off time (per the following listed times) and then turns on according to the
SCON setting.
00 = off time disabled2.
01 = 0.6 sec.
10 = 1.2 sec.
11 = 1.8 sec.
1 If SCON is set to 0 sec, then after the ISC completes a ramp up, it immediately starts to ramp back down again (if SCxOFF is not disabled). SCON should not be set to 0 if
the fade-in time is also 0 seconds.
2 An independent sink remains on continuously when it is enabled and SCxOFF is disabled.
Independent Sink Current Time (ISCT2)—Register 0x1D
Table 46. ISCT2 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SC4OFF SC3OFF SC2OFF SC1OFF
ADP8866 Data Sheet
Rev. B | Page 36 of 52
Table 47.
Designation Bit Description1
SC4OFF [7:6] SC4 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to any
other value, the ISC turns off for the off time (per the following listed times) and then turns on according to the
SCON setting.
00 = off time disabled.
01 = 0.6 sec.
10 = 1.2 sec.
11 = 1.8 sec.
SC3OFF [5:4] SC3 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to any
other value, the ISC turns off for the off time (per the following listed times) and then turns on according to the
SCON setting.
00 = off time disabled.
01 = 0.6 sec.
10 = 1.2 sec.
11 = 1.8 sec.
SC2OFF [3:2] SC2 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to any
other value, the ISC turns off for the off time (per the following listed times) and then turns on according to the
SCON setting.
00 = off time disabled.
01 = 0.6 sec.
10 = 1.2 sec.
11 = 1.8 sec.
SC1OFF [1:0] SC1 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to any
other value, the ISC turns off for the off time (per the following listed times) and then turns on according to the
SCON setting.
00 = off time disabled.
01 = 0.6 sec.
10 = 1.2 sec.
11 = 1.8 sec.
1 An independent sink remains on continuously when it is enabled and SCxOFF is 00 (disabled).
Independent Sink 6 Off Timer (OFFTIMER6)—Register 0x1E
Table 48. OFFTIMER6 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC6OFF
Table 49.
Bit Name Bit No. Description
N/A 7 Reserved.
SC6OFF
[6:0]
SC6 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to
any other value, the ISC turns off for the off time (per the following listed times) and then turns on according to
the SCON setting.
0000 = disabled1.
0000001 = 0.0 sec2.
0000010 = 0.1 sec.
0000011 = 0.2 sec.
…
1111110 = 12.5 sec.
1111111 = off3.
1 An independent sink remains on continuously when it is enabled and SCxOFF is 00 (disabled).
2 Setting SCxOFF to 0 seconds is not recommended if the SCFO fade-out time is also set to 0 seconds.
3 Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off.
Data Sheet ADP8866
Rev. B | Page 37 of 52
Independent Sink 7 Off Timer (OFFTIMER7)—Register 0x1F
Table 50. OFFTIMER7 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC7OFF
Table 51.
Bit Name Bit No. Description
N/A 7 Reserved.
SC7OFF [6:0]
SC7 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to
any other value, the ISC turns off for the off time (per the following listed times) and then turns on according to
the SCON setting.
0000 = disabled1.
0000001 = 0.0 sec2.
0000010 = 0.1 sec.
0000011 = 0.2 sec.
…
1111110 = 12.5 sec.
1111111 = off3.
1 An independent sink remains on continuously when it is enabled and SCxOFF is 00 (disabled).
2 Setting SCxOFF to 0 seconds is not recommended if the SCFO fade-out time is also set to 0 seconds.
3 Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off.
Independent Sink 8 Off Timer (OFFTIMER8)—Register 0x20
Table 52. OFFTIMER8 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC8OFF
Table 53.
Bit Name Bit No. Description
N/A 7 Reserved
SC8OFF [6:0]
SC8 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to
any other value, the ISC turns off for the off time (per the following listed times) and then turns on according to
the SCON setting.
0000 = disabled1.
0000001 = 0.0 sec2.
0000010 = 0.1 sec.
0000011 = 0.2 sec.
…
1111110 = 12.5 sec.
1111111 = off3.
1 An independent sink remains on continuously when it is enabled and SCxOFF is 00 (disabled).
2 Setting SCxOFF to 0 seconds is not recommended if the SCFO fade-out time is also set to 0 seconds.
3 Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off.
ADP8866 Data Sheet
Rev. B | Page 38 of 52
Independent Sink 9 Off Timer (OFFTIMER9)—Register 0x21
Table 54. OFFTIMER9 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC9OFF
Table 55.
Bit Name Bit No. Description
N/A 7 Reserved.
SC9OFF [6:0] SC9 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to
any other value, the ISC turns off for the off time (per the following listed times) and then turns on according to
the SCON setting.
0000 = disabled1.
0000001 = 0.0 sec2.
0000010 = 0.1 sec.
0000011 = 0.2 sec.
…
1111110 = 12.5 sec.
1111111 = off3.
1 An independent sink remains on continuously when it is enabled and SCxOFF is 00 (disabled).
2 Setting SCxOFF to 0 seconds is not recommended if the SCFO fade-out time is also set to 0 seconds.
3 Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off.
Independent Sink Current Fade (ISCF)—Register 0x22
Table 56. ISCF Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SCFO SCFI
Table 57.
Bit Name Bit No. Description
SCFO [7:4] Sink current fade-out time. Note that the fade time given is from full scale to zero (the actual full-scale value is
affected by the LEVEL_SET bits). Binary code fade-out times are as follows:
0000 = disabled.
0001 = 0.05 sec.
0010 = 0.10 sec.
0011 = 0.15 sec.
0100 = 0.20 sec.
0101 = 0.25 sec.
0110 = 0.30 sec.
0111 = 0.35 sec.
1000 = 0.40 sec.
1001 = 0.45 sec.
1010 = 0.50 sec.
1011 = 0.75 sec.
1100 = 1.00 sec.
1101 = 1.25 sec.
1110 = 1.50 sec.
1111 = 1.75 sec.
Data Sheet ADP8866
Rev. B | Page 39 of 52
Bit Name Bit No. Description
SCFI [3:0] Sink current fade-in time. Note that the fade time given is from zero to full scale (the actual full-scale value is affected
by the LEVEL_SET bits). Binary code fade-out times are as follows:
0000 = disabled.
0001 = 0.05 sec.
0010 = 0.10 sec.
0011 = 0.15 sec.
0100 = 0.20 sec.
…
1111 = 1.75 sec.
Sink Current Register LED1(ISC1)—Register 0x23
Table 58. ISC1 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD1
Table 59.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD1 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00
0.0
0.0
0.0
0.0
0.0
0x01
0.0016
0.0008
0.0005
0.0004
0.0003
0x02
0.0062
0.0031
0.0021
0.0016
0.0012
0x03
0.014
0.0070
0.0047
0.0035
0.0028
…
…
…
…
…
…
0x7F 25.0 12.5 8.33 6.25 5.0
Sink Current Register LED2 (ISC2)—Register 0x24
Table 60. ISC2 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD2
Table 61.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD2 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC Code
Current (mA)
(Full Scale =
25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET=001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET=010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET=100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
ADP8866 Data Sheet
Rev. B | Page 40 of 52
Sink Current Register LED3 (ISC3)—Register 0x25
Table 62. ISC3 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD3
Table 63.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD3 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC Code
Current (mA)
(Full Scale =
25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03
0.014
0.0070
0.0047
0.0035
0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Sink Current Register LED4 (ISC4)—Register 0x26
Table 64. ISC4 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD4
Table 65.
Bit Name
Bit No.
Description
N/A 7 Reserved.
SCD4 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC Code
Current (mA)
(Full Scale =
25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Sink Current Register LED5 (ISC5)—Register 0x27
Table 66. ISC5 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD5
Data Sheet ADP8866
Rev. B | Page 41 of 52
Table 67.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD5 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Sink Current Register LED6 (ISC6)—Register 0x28
Table 68. ISC6 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD6
Table 69.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD6 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Sink Current Register LED7 (ISC7)—Register 0x29
Table 70. ISC7 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD7
ADP8866 Data Sheet
Rev. B | Page 42 of 52
Table 71.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD7 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale = 5.0 mA)
LEVEL_SET = 101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Sink Current Register LED8 (ISC8)—Register 0x2A
Table 72. ISC8 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved
SCD8
Table 73.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD8 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01
0.0016
0.0008
0.0005
0.0004
0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Sink Current Register LED9 (ISC9)—Register 0x2B
Table 74. ISC9 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD9
Table 75.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD9 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Data Sheet ADP8866
Rev. B | Page 43 of 52
Heartbeat Enable Selection (HB_SEL)—Register 0x2C
Table 76. HB_SEL Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved D9HB_EN D8HB_EN D7HB_EN D6HB_EN
Table 77.
Bit Name Bit No. Description
N/A [7:4] Reserved.
D9HB_EN 3 Diode 9 heartbeat enable.
1 = heartbeat for this channel is enabled (all HB registers apply to every even numbered pulse).
0 = heartbeat for this channel is disabled (all HB registers are ignored).
D8HB_EN 2 Diode 8 heartbeat enable.
1 = heartbeat for this channel is enabled (all HB registers apply to every even numbered pulse).
0 = heartbeat for this channel is disabled (all HB registers are ignored).
D7HB_EN 1 Diode 7 heartbeat enable.
1 = heartbeat for this channel is enabled (all HB registers apply to every even numbered pulse).
0 = heartbeat for this channel is disabled (all HB registers are ignored).
D6HB_EN 0 Diode 6 heartbeat enable.
1 = heartbeat for this channel is enabled (all HB registers apply to every even numbered pulse).
0 = heartbeat for this channel is disabled (all HB registers are ignored).
Independent Sink Current LED6—Even Heartbeat Pulses (ISC6_HB)—Register 0x2D
Table 78. ISC6_HB Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD6_HB
Table 79.
Bit Name
Bit No.
Description
N/A 7 Reserved.
SCD6_HB [6:0] Sink current for the even numbered pulses when heartbeat mode for this channel is enabled. Use the following DAC code schedule.
See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale =
25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Independent Sink Current LED7—Even Heartbeat Pulses (ISC7_HB)—Register 0x2E
Table 80. ISC7_HB Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD7_HB
ADP8866 Data Sheet
Rev. B | Page 44 of 52
Table 81.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD7_HB [6:0] Sink current for the even numbered pulses when heartbeat mode for this channel is enabled. Use the following DAC code schedule.
See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00
0.0
0.0
0.0
0.0
0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Independent Sink Current LED8—Even Heartbeat Pulses (ISC8_HB)—Register 0x2F
Table 82. ISC8_HB Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCD8_HB
Table 83.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD8_HB [6:0] Sink current for the even numbered pulses when heartbeat mode for this channel is enabled. Use the following DAC code schedule.
See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
…
…
…
…
…
…
0x7F 25.0 12.5 8.33 6.25 5.0
Independent Sink Current LED9—Even Heartbeat Pulses (ISC9_HB)—Register 0x30
Table 84. ISC9_HB Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved
SCD9_HB
Data Sheet ADP8866
Rev. B | Page 45 of 52
Table 85.
Bit Name Bit No. Description
N/A 7 Reserved.
SCD9_HB [6:0] Sink current for the even numbered pulses when heartbeat mode for this channel is enabled. Use the following DAC code schedule.
See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00
0.0
0.0
0.0
0.0
0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Independent Sink 6 Off Timer—Even Heartbeat Pulses (OFFTIMER6_HB)—Register 0x31
Table 86. OFFTIMER6_HB Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC6OFF_HB
Table 87.
Bit Name Bit No. Description
N/A 7 Reserved.
SC6OFF_HB
[6:0]
SC6 off time for the even numbered pulses when heartbeat mode for this channel is enabled. When the
SC6OFF_HB time is disabled, SC6 goes immediately from the even numbered on time to the odd numbered on
time. When the SC off time is set to any other value, the ISC turns off for the off time (per the following listed
times) and then turns on according to the SCON6_HB setting.
0000 = disabled1.
0000001 = 0.0 sec2.
0000010 = 0.1 sec.
0000011 = 0.2 sec.
…
1111110 = 12.5 sec.
1111111 = off3.
1 A disabled setting leaves the LED on. This is useful for setting up a blink sequence that runs once and then stays on.
2 Setting SCxOFF_HB to 0 seconds is not recommended if the SCFO_HB fade-out time is also set to 0 seconds.
3 Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off.
Independent Sink 7 Off Timer—Even Heartbeat Pulses (OFFTIMER7_HB)—Register 0x32
Table 88. OFFTIMER7_HB Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC7OFF_HB
ADP8866 Data Sheet
Rev. B | Page 46 of 52
Table 89.
Bit Name Bit No. Description
N/A 7 Reserved.
SC7OFF_HB [6:0] SC7 off time for the even numbered pulses when heartbeat mode for this channel is enabled. When the
SC7OFF_HB time is disabled, SC7 goes immediately from the even numbered on time to the odd numbered on
time. When the SC off time is set to any other value, the ISC turns off for the off time (per the following listed
times) and then turns on according to the SCON7_HB setting.
0000 = disabled1.
0000001 = 0.0 sec2.
0000010 = 0.1 sec.
0000011 = 0.2 sec.
…
1111110 = 12.5 sec.
1111111 = off3.
1 A disabled setting leaves the LED on. This is useful for setting up a blink sequence that runs once and then stays on.
2 Setting SCxOFF_HB to 0 seconds is not recommended if the SCFO_HB fade-out time is also set to 0 seconds.
3 Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off.
Independent Sink 8 Off Timer—Even Heartbeat Pulses (OFFTIMER8_HB)—Register 0x33
Table 90. OFFTIMER8_HB Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC8OFF_HB
Table 91.
Bit Name Bit No. Description
N/A 7 Reserved.
SC8OFF_HB [6:0] SC8 off time for the even numbered pulses when heartbeat mode for this channel is enabled. When the
SC8OFF_HB time is disabled, SC8 goes immediately from the even numbered on time to the odd numbered on
time. When the SC off time is set to any other value, the ISC turns off for the off time (per the following listed
times) and then turns on according to the SCON8_HB setting.
0000 = disabled1.
0000001 = 0.0 sec2.
0000010 = 0.1 sec.
0000011 = 0.2 sec.
…
1111110 = 12.5 sec.
1111111 = off
3
.
1 A disabled setting leaves the LED on. This is useful for setting up a blink sequence that runs once and then stays on.
2 Setting SCxOFF_HB to 0 seconds is not recommended if the SCFO_HB fade-out time is also set to 0 seconds.
3 Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off.
Independent Sink 9 Off Timer—Even Heartbeat Pulses (OFFTIMER9_HB)—Register 0x34
Table 92. OFFTIMER9_HB Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SC9OFF_HB
Data Sheet ADP8866
Rev. B | Page 47 of 52
Table 93.
Bit Name Bit No. Description
N/A 7 Reserved.
SC9OFF_HB [6:0] SC9 off time for the even numbered pulses when heartbeat mode for this channel is enabled. When the
SC9OFF_HB time is disabled, SC9 goes immediately from the even numbered on time to the odd numbered on
time. When the SC off time is set to any other value, the ISC turns off for the off time (per the following listed
times) and then turns on according to the SCON9_HB setting.
0000 = disabled1.
0000001 = 0.0 sec2.
0000010 = 0.1 sec.
0000011 = 0.2 sec.
…
1111110 = 12.5 sec.
1111111 = off3.
1 A disabled setting leaves the LED on. This is useful for setting up a blink sequence that runs once and then stays on.
2 Setting SCxOFF_HB to 0 seconds is not recommended if the SCFO_HB fade-out time is also set to 0 seconds.
3 Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off.
Heartbeat On Time (ISCT_HB)—Register 0x35
Table 94. ISCTHB1 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SCON_HB
Table 95.
Bit Name Bit No. Description
N/A [7:4] Reserved.
SCON_HB [3:0] On time for D6 to D9 even numbered pulses, when heartbeat is enabled for those channels.
0000 = 0.00 sec.
0001 = 0.05 sec.
0010 = 0.10 sec.
0011 = 0.15 sec.
0100 = 0.20 sec.
0101 = 0.25 sec.
0110 = 0.30 sec.
0111 = 0.35 sec.
1000 = 0.40 sec.
1001 = 0.45 sec.
1010 = 0.50 sec.
1011 = 0.55 sec.
1100 = 0.60 sec.
1101 = 0.65 sec.
1110 = 0.70 sec.
1111 = 0.75 sec.
Enable Delay Time for SC6 (DELAY6)—Register 0x3C
Table 96. DELAY6 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved DELAY6
ADP8866 Data Sheet
Rev. B | Page 48 of 52
Table 97.
Bit Name Bit No. Description
N/A 7 Reserved.
DELAY6
[6:0]
Enable delay time for SC6. When SC6 is enabled, the ADP8866 automatically waits the specified time before starting
the SC6 fade-in.
0000 = 0 ms (no delay when SC6 enable is exercised).
0000001 = 10 ms.
0000010 = 20 ms.
0000011 = 30 ms.
…
1111111 = 1270 ms.
Enable Delay Time for SC7 (DELAY7)—Register 0x3D
Table 98. DELAY7 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved DELAY7
Table 99.
Bit Name Bit No. Description
N/A 7 Reserved.
DELAY7 [6:0] Enable delay time for SC7. When SC7 is enabled, the ADP8866 automatically waits the specified time before starting
the SC7 fade-in.
0000 = 0 ms (no delay when SC7 enable is exercised).
0000001 = 10 ms.
0000010 = 20 ms.
0000011 = 30 ms.
…
1111111 = 1270 ms.
Enable DelayTime for SC8 (DELAY8)—Register 0x3E
Table 100. DELAY8 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved DELAY8
Table 101.
Bit Name
Bit No.
Description
N/A 7 Reserved.
DELAY8 [6:0] Enable delay time for SC8. When SC8 is enabled, the ADP8866 automatically waits the specified time before starting
the SC8 fade-in.
0000 = 0 ms (no delay when SC8 enable is exercised).
0000001 = 10 ms.
0000010 = 20 ms.
0000011 = 30 ms.
…
1111111 = 1270 ms.
Enable Delay Time for SC9 (DELAY9)—Register 0x3F
Table 102. DELAY9 Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved DELAY9
Data Sheet ADP8866
Rev. B | Page 49 of 52
Table 103.
Bit Name Bit No. Description
N/A 7 Reserved.
DELAY9 [6:0] Enable delay time for SC9. When SC9 is enabled, the ADP8866 automatically waits the specified time before starting
the SC9 fade-in.
0000 = 0 ms (no delay when SC9 enable is exercised).
0000001 = 10 ms.
0000010 = 20 ms.
0000011 = 30 ms.
…
1111111 = 1270 ms.
ADP8866 Data Sheet
Rev. B | Page 50 of 52
OUTLINE DIMENSIONS
0.50
BSC
0.50
0.40
0.30
0.30
0.25
0.18
COMPLIANT
TO
JEDEC STANDARDS MO-220-WGGD-11.
4.10
4.00 SQ
3.90
0.80
0.75
0.70 0.05 MAX
0.02 NOM
0.20 REF
0.20 MIN
COPLANARITY
0.08
PIN 1
INDICATOR
2.75
2.60 SQ
2.35
1
20
6
10
11
15
16
5
BOTTOM VIEW
TOP VIEW
SIDE VIEW
FOR PROPER CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CONFIGURATION AND
FUNCTION DESCRIPTIONS
SECTION OF THIS DATA SHEET.
10-12-2017-C
EXPOSED
PAD
PKG-003502
SEATING
PLANE
PIN 1
INDICATOR AREA OPTIONS
(SEE DETAIL A)
DETAIL A
(JEDEC 95)
Figure 42. 20 Lead Lead Frame Chip Scale Package [LFCSP]
4 mm × 4 mm Body and 0.75 mm Package Height
(CP-20-8)
Dimensions shown in millimeters
09478-043
DIRECTION OF FEED
Figure 43. Tape and Reel Orientation for LFCSP Units
ORDERING GUIDE
Model1 Temperature Range Package Description Package Option
ADP8866ACPZ-R7 −40°C to +105°C 20-Lead LFCSP, 7“ Tape and Reel CP-20-8
1 Z = RoHS Compliant Part.
Data Sheet ADP8866
Rev. B | Page 51 of 52
NOTES
ADP8866 Data Sheet
Rev. B | Page 52 of 52
NOTES
I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).
©2011–2017 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D09478-0-11/17(B)
