ML22Q533 datasheet(21/178 Pages) ROHM

21 / 178 page

FEDL22Q53X-02

ML22Q53X

● I2C Interface (Slave)

This serial interface conforms to the I

2C bus specifications. It supports Fast modes and can transmit and receive data at

400kbit/s. The SCL and SDA pins are used to input various command data and to read the status. The slave addresses are set

by the SAD0 to 2 pins.

When I

2C is used, be sure to insert a pull-up resistor between SCL and SDA pins and DV

DD pin.

In the communication flow between the master and this device (slave) on the I

2C bus, after the start condition is set, the slave

address (upper 3 bits of the slave address are set by the SAD0 to 2 pins) is entered in the first 7 bits, the data direction is

determined in the 8th bit (when the 8th bit is "0", data is written from the master, and data is read from the master when "1")

and communication is performed in byte units thereafter. At this time, acknowledgment is required for each byte.

Accessing with clock synchronous serial interface at the same time is prohibited.

The I

2C communication flow/timing chart is shown below.

 Command flow when writing data (1-byte command)

Start condition

Slave address +W(0)

Write data (ex. Command 1st byte)

Stop condition

- Timing chart when writing data. （1 byte command）

SCL

SDA

A6 A5 A4 A3 A2 A1 A0

D7 D6 D5 D4 D3 D2 D1

Slave Address

1st Command Data

CBUSYB

S Start condition

P Stop condition

A Acknowledge

21/178

ML22Q533 Datasheet(PDF) 21 Page - Rohm