ADP8863 Analog Devices, ADP8863 Datasheet - Page 29

• Manufacturer Part Number: ADP8863
• Description: Charge Pump, 7-Channel Fun Lighting LED Driver
• Manufacturer: Analog Devices

Specifications of ADP8863

• Vin Range: 2.5 to 5.5V
• Vout (v): 4.3 to 5.5
• Synchronous: No
• Package: 20-Lead LFCSP,20-Lead WLCSP
• Led Configuration: Parallel
• Topology: Capacitive
• I2c Support: Yes
• Max Iout (ma): 60mA
• Brightness Control: I2C
• Peak Efficiency (%): 89%
• Switching Frequency: 1.32MHz
• Over Volt Protection (v): 5V

BACKLIGHT REGISTER DESCRIPTIONS
Configuration Register (CFGR)—Register 0x04
Table 17. CFGR Bit Map
Bit 7
Reserved
Table 18. Bit Descriptions for the CFGR Register
Bit Name
N/A
SEL_AB
CMP2_SEL
BLV
Law
FOVR
Backlight Sink Enable (BLSEN)—Register 0x05
Table 19. BLSEN Bit Map
Bit 7
Reserved
Table 20. Bit Descriptions for the BLSEN Register
Bit Name
N/A
D7EN
D6EN
D5EN
D4EN
D3EN
Bit No.
7
6
5
[4:3]
[2:1]
0
Description
Reserved.
1 = selects the second phototransistor (CMP_IN2) to control the backlight.
0 = selects the main phototransistor (CMP_IN) to control the backlight.
1 = the second phototransistor is enabled; the current sink on D6 is disabled.
0 = the second phototransistor is disabled.
Brightness level. This field indicates the brightness level at which the device is operating. The software may force the
backlight to operate at one of the three brightness levels. Setting CMP_AUTOEN high (Register 0x01) sets these
values automatically and overwrites any previously written values.
00 = Level 1 (daylight).
01 = Level 2 (office).
10 = Level 3 (dark).
11 = off (backlight set to 0 mA).
Backlight transfer law.
00 = linear 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).
Backlight fade override.
1 = the backlight fade override is enabled.
0 = the backlight fade override is disabled.
Bit 6
SEL_AB
Bit No.
7
6
5
4
3
2
Bit 6
D7EN
Bit 5
D6EN
Description
Reserved
Diode 7 backlight sink enable
1 = selects LED7 as an independent sink
0 = connects LED7 sink to backlight enable (BL_EN)
Diode 6 backlight sink enable
1 = selects LED6 as an independent sink
0 = connects LED6 sink to backlight enable (BL_EN)
Diode 5 backlight sink enable
1 = selects LED5 as an independent sink
0 = connects LED5 sink to backlight enable (BL_EN)
Diode 4 backlight sink enable
1 = selects LED4 as an independent sink
0 = connects LED4 sink to backlight enable (BL_EN)
Diode 3 backlight sink enable
1 = selects LED3 as an independent sink
0 = connects LED3 sink to backlight enable (BL_EN)
Bit 5
CMP2_SEL
Bit 4
D5EN
Rev. A | Page 29 of 52
Bit 4
Bit 3
D4EN
BLV
Bit 3
Bit 2
D3EN
Bit 2
Law
Bit 1
D2EN
Bit 1
ADP8863
Bit 0
D1EN
Bit 0
FOVR