RT4539A

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is a registered trademark of Richtek Technology Corporation

DS4539A-01

December 2022

www.richtek.com

29

Backlight Control

The backlight and/or FB channel can be enabled or disabled independently via address 0x0Bh register. If users

desires to configure any functions, the BL_EN is recommended to write 0 by I2C interface. More setting details are

shown in the following table.

For WL-CSP-20B 1.71x2.371 (BSC) Package

Address Bit

Name

Default Value

Description

R/W

0Bh

[7]

BL_EN

Backlight enable

(B1)

Enable backlight.

B0: Backlight disabled (This selection is recommended for

systems with an I2C master. With an I2C master, the backlight

can be controlled by writing to the register 0Bh.)

B1: Backlight enabled (This selection is recommended for

systems with PWM only control.)

R/W

[6] FB6_EN

ON (B1)

FB6 Enable

B0: OFF

B1: ON

R/W

[5] FB5_EN

ON (B1)

FB5 Enable

B0: OFF

B1: ON

R/W

[4] FB4_EN

ON (B1)

FB4 Enable

B0: OFF

B1: ON

R/W

[3] FB3_EN

ON (B1)

FB3 Enable

B0: OFF

B1: ON

R/W

[2] FB2_EN

ON (B1)

FB2 Enable

B0: OFF

B1: ON

R/W

[1] FB1_EN

ON (B1)

FB1 Enable

B0: OFF

B1: ON

R/W