RT5510WSC datasheet(13/52 Pages) RICHTEK

13 / 52 page

RT5510

is a registered trademark of Richtek Technology Corporation

DS5510-00

October

2019

www.richtek.com

7 bits Slave Address

8 bits Register Address

8 bits Data for Reg.

Address

R/W

Stop

condition

Start

condition

SDA

SCL

MSB

LSB

Figure 1. Typical I2C Format

Read and Write Function

The RT5510 single-byte data-read function format is shown in Figure 2.

Data transfer is initiated when the master device transmits a start condition: SDA is pulled low while SCL stays high,

followed by the slave address. The data is sampled when SCL rises for the first bit. The read/write bit is set to 0 to

declare the RT5510 address byte to be read. After slave device address and the read/write bit, the RT5510 device

responds an acknowledge bit. In second step, the master device sends the RT5510 internal memory address to be

read and the RT5510 responds with an acknowledge bit. Then the master device sends start condition again

followed by setting the RT5510 device address and read/write bit to 1, and the RT5510 device responds an

acknowledge bit. (Setting the read/write bit to 1 represents read internal memory address data.)

The RT5510 sends out data from the register to read. After receiving register data, the master device replies

no-acknowledge bit (SDA go high) to indicate that it has not continued to read the data. Then master device sends

stop condition (when SDA is pulled high while SCL is high) to complete the single-byte data reading function.

About read multiple data byte, the format is the same as reading a single data byte, and the only difference is the

data byte amount sent form slave device. The master device replies with an acknowledge bit after receiving each

data byte. After the RT5510 sends the last data byte, the master device replies no-acknowledge bit and transmits a

stop condition.

LSB

MSB

Assume Address = m

Data for Address = m

Data for Address = m + N - 1

Data for Address = m + 1

Slave Address

Data 1

R/W

Read N bytes of data from Registers

LSB

MSB

Data 2

Data N

LSB

MSB

LSB

MSB

Assume Address = m

Data for Address = m

Slave Address

Data

R/W

Read single byte of data from Register

Figure 2. Single-byte and Multiple-byte I2C Read Format

RT5510WSC Datasheet(PDF) 13 Page - Richtek Technology Corporation

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