RT4539A

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is a registered trademark of Richtek Technology Corporation

DS4539A-01

December 2022

www.richtek.com

9

Typical Application Circuit

FB1

FB2

FB3

VIN

VOUT

FB4

L1

D1

RT4539A

:

:

:

:

:

:

:

:

:

:

:

:

COUT1

LX

AGND

:

:

:

:

:

:

FB5

FB6

PGND

C1

EN

SCL

SDA

MCU

VIN

CIN

PWM

R1

1, 2

3, 4

5

6

9

7

22

20

12

CCP

VCP

19

10,11

13

18

17

16

14

COUT2

Timing Diagram

I2C Interface

S

tHD, STA

tSU, DAT

tLOW

tf

tr

tHIGH

tSU, STO

tBUF

P

S

SDA

SCL

tHD, DAT

VIL (MAX)

VIH (MIN)

VIL (MAX)

VIH (MIN)

RT4539A I2C slave address = 7'b0111_100. The I2C interface supports fast mode (bit rate up to 400kb/s). The

write or read bit stream (N ≥ 1) is shown below :

S

0

1

A P

LSB

MSB

A

Assume Address = m

Data for Address = m

Data for Address = m + N - 1

A

Data for Address = m + 1

S

0

P

Assume Address = m

Data for Address = m

Data for Address = m + N - 1

Data for Address = m + 1

Sr

Slave Address

Register Address

Slave Address

Data 1

R/W

R/W

Data N

LSB

MSB

A

A

A

A

A

A

A

A

Read N bytes from RT4539

LSB

MSB

Data 2

Data N

LSB

MSB

LSB

Slave Address

Register Address

Data 1

Data 2

MSB

MSB

LSB

Write N bytes to RT4539

Driven by Master,

Driven by Slave (RT4539),

Start,

Repeat Start

Stop, S

Sr

P