RV5C387A_03 datasheet(26/49 Pages) RICOH | I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

Part No.	RV5C387A

Description	I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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RV5C387A

26

1.2-4 Data transmission write format in the RV5C387A

Although the I

2C bus standard defines a transmission format for the slave address allocated for each IC,

transmission method of address information in IC is not defined. The RV5C387A transmits data the internal address

pointer (4bit) and the transmission format register (4bit) at the 1byte next to one which transmitted a slave address

and a write command. For write operation only one transmission format is available and (0000) is set to the

transmission format register. The 3byte transmits data to the address specified by the internal address pointer

written to the 2byte. Internal address pointer settings are automatically incremented for 4byte and after. Note that

when the internal address pointer is Fh, it will change to 0h on transmitting the next byte.

Example of data writing (When writing to internal address Eh to Fh)

S 0 11 0

0

1

0

1 11 0

0 0

0

AA

A

P

A

R/W=0 (Write)

Transmission of

slave address

(0110010)

Setting of

Eh to the

internal

address

pointer

Setting of

0h to the

trans-

mission

format

register

Writing of data to the

internal address Eh.

Writing of data to the

internal address Fh.

Data

S

AA

Master to slave

Start condition

Acknowledge signal

A

P

Slave to master

Stop condition

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RV5C387A Datasheet(PDF) 26 Page - RICOH electronics devices division

RV5C387A Datasheet(HTML) 26 Page - RICOH electronics devices division

Similar Part No. - RV5C387A_03

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