LP8556 datasheet(33/63 Pages) TI1

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LP8556

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SNVS871I – JULY 2012 – REVISED MARCH 2016

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8.6.1 Register Bit Explanations

8.6.1.1 Brightness Control

Address 00h

Reset value 0000 0000b

BRIGHTNESS CONTROL REGISTER

BRT[7:0]

NAME

BIT

ACCESS

DESCRIPTION

BRT

7:0

R/W

Backlight PWM 8-bit linear control.

8.6.1.2 Device Control

Address 01h

Reset value 0000 0000b

DEVICE CONTROL REGISTER

FAST

BRT_MODE[1:0]

BL_CTL

NAME

BIT

ACCESS

DESCRIPTION

FAST

Skip refresh of trim and configuration registers from EPROMs when exiting the low

power STANDBY mode.

0 = read EPROMs before returning to the ACTIVE state

1 = only read EPROMs once on initial power-up.

BRT_MODE

2:1

R/W

Brightness source mode Figure 7

00b = PWM input only

01b = PWM input and Brightness register (combined before shaper block)

10b = Brightness register only

11b = PWM input and Brightness register (combined after shaper block)

BL_CTL

R/W

Enable backlight when Brightness Register is used to control brightness

(BRT_MODE = 10).

0 = Backlight disabled and chip turned off

1 = Backlight enabled and chip turned on

This bit has no effect when PWM pin control is selected for brightness control

(BRT_MODE = 00). In this mode the state of PWM pin enable or disables the chip.

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