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ADP8863
BACKLIGHT REGISTER DESCRIPTIONS
Configuration Register (CFGR)—Register 0x04
Table 17. CFGR Bit Map
Bit 7
Reserved
Bit 6
SEL_AB
Bit 5
CMP2_SEL
Bit 4
Bit 3
BLV
Bit 2
Bit 1
Law
Bit 0
FOVR
Table 18. Bit Descriptions for the CFGR Register
Bit Name
N/A
SEL_AB
CMP2_SEL
BLV
Law
FOVR
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.
Backlight Sink Enable (BLSEN)—Register 0x05
Table 19. BLSEN Bit Map
Bit 7
Reserved
Bit 6
D7EN
Bit 5
D6EN
Bit 4
D5EN
Bit 3
D4EN
Bit 2
D3EN
Bit 1
D2EN
Bit 0
D1EN
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
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)
Rev. A | Page 29 of 52
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