ADP8863

Rev. 0 | Page 29 of 48

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)