Datasheet
ADP8863
Rev. A | Page 29 of 52
BACKLIGHT REGISTER DESCRIPTIONS
Configuration Register (CFGR)—Register 0x04
Table 17. CFGR Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SEL_AB CMP2_SEL BLV Law FOVR
Table 18. Bit Descriptions for the CFGR Register
Bit Name Bit No. Description
N/A 7 Reserved.
SEL_AB 6 1 = selects the second phototransistor (CMP_IN2) to control the backlight.
0 = selects the main phototransistor (CMP_IN) to control the backlight.
CMP2_SEL 5 1 = the second phototransistor is enabled; the current sink on D6 is disabled.
0 = the second phototransistor is disabled.
BLV [4:3]
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).
Law [2:1] 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).
FOVR 0 Backlight fade override.
1 = the backlight fade override is enabled.
0 = the backlight fade override is disabled.
Backlight Sink Enable (BLSEN)—Register 0x05
Table 19. BLSEN Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved D7EN D6EN D5EN D4EN D3EN D2EN D1EN
Table 20. Bit Descriptions for the BLSEN Register
Bit Name Bit No. Description
N/A 7 Reserved
D7EN 6 Diode 7 backlight sink enable
1 = selects LED7 as an independent sink
0 = connects LED7 sink to backlight enable (BL_EN)
D6EN 5 Diode 6 backlight sink enable
1 = selects LED6 as an independent sink
0 = connects LED6 sink to backlight enable (BL_EN)
D5EN 4 Diode 5 backlight sink enable
1 = selects LED5 as an independent sink
0 = connects LED5 sink to backlight enable (BL_EN)
D4EN 3 Diode 4 backlight sink enable
1 = selects LED4 as an independent sink
0 = connects LED4 sink to backlight enable (BL_EN)
D3EN 2 Diode 3 backlight sink enable
1 = selects LED3 as an independent sink
0 = connects LED3 sink to backlight enable (BL_EN)