RT4539A

Copyright © 2022 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation

DS4539A-01

December 2022

www.richtek.com

13

Application Information

Richtek’s component specification does not include the following information in the Application Information section.

Thereby no warranty is given regarding its validity and accuracy. Customers should take responsibility to verify their

own designs and to ensure the functional suitability of their components and systems.

Table 1. Register Map

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

Slave Address: b0111_100

Register

Address

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Default

Value

0x00

Spread

Spectrum

LX Edge Rate

Control

Mixed Mode

Change Duty

Dimming Mode Selection

0x6B

0x01

Switching

Current

Limitation

Selection

Boost Switching Frequency

0x17

0x02

ILED Current Setting

0x82

0x03

ILED

Mapping

Mode

LED driver

headroom

Bit selection

0x04

0x04

ILED Brightness MSB Register

0x00

0x05

ILED Brightness LSB Register

0x00

0x06

Filter

Slope Time Control

Fade In / Out Time Control

0xA8

0x07

PWM sample rate

Advanced Brightness

Control

0x00

0x08

26KHz Mode Division

Frequency

Soft Start Time

Control

0x00

0x09

Lowest Switching Frequency for PFM

Control

CLK PFM

Function

Enable

0x78

0x0A

LED Short

Protection

LED OVP Level

Boost Over-voltage Protection selection

0x1Dh

0x0B

BL_EN

FB6_EN FB5_EN FB4_EN

FB3_EN

FB2_EN FB1_EN

0xFE

0xFF

MTP

Programming

MTP

Read 0x00

Note: Blank parts in this table are restricted registers.