RV5C387A_03 datasheet(24/49 Pages) RICOH

Part #	RV5C387A

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

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Manufacturer	RICOH [RICOH electronics devices division]

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RV5C387A

24

1.2 Transmission System of I

2C bus

1.2-1 Start and stop conditions

In I

2C bus, SDA must be kept at a certain state while SCL is at the “H” state as shown below during data

transmission.

tHDL;DAT or tHDH;DAT

tSU;DAT

SDA

SCL

The SCL and SDA pins are at the “H” level when no data transmission is made. Changing the SDA from “H” to “L”

when the SCL is “H” activates the start condition and access is started. Changing the SDA from “L” to “H” when the

SCL is “H” activates stop condition and accessing stopped. Generation of start and stop conditions are always made

by the master (see the figure below).

Stop condition

tSU;STO

tHD;STA

Start condition

SDA

SCL

1.2-2 Data transmission and its acknowledge

After start condition is entered, data is transmitted by 1byte (8bits). Any bytes of data may be serially transmitted.

The receiving side will send an acknowledge signal to the transmission side each time 8bit data is transmitted.

The acknowledge signal is sent immediately after falling to “L” of SCL8bit clock pulses of data transmission, by

releasing the SDA by the transmission side that has asserted the bus at that time and by turning the SDA to “L” by

the receiving side. When transmission of 1byte data next to preceding 1byte of data is received the receiving side

releases the SDA pin at falling edge of the SCL9bit of clock pulses or when the receiving side switches to the

transmission side it starts data transmission. When the master is the receiving side, it generates no acknowledge

signal after the last 1byte of data from the slave to tell the transmitter that data transmission has completed when

the slave side (transmission side) continues to release the SDA pin so that the master will be able to generate stop

condition.

12

89

Acknowledge signal

Start condition

SCL from the master

SDA from

the transmission side

SDA from

the receiving side

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RV5C387A Datasheet(PDF) 24 Page - RICOH electronics devices division

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