FOR AUTOMOTIVE 125°C OPERATION 2-WIRE CONVENIENCE TIMER

S-35710 Series

19

4. Data transmission format

After the start condition transmission, the 1st byte is a slave address and a command (read / write bit) that shows the

transmission direction of the data at the 2nd byte or subsequent bytes.

The slave address of the S-35710 Series is specified to "0110010". The data can be written to the wake-up time

register when read / write bit is "0", and the data of the wake-up time register or the time register can be read when

read / write bit is "1".

When the data can be written to the wake-up time register, input the data from the master device in order of B7 to B0.

The acknowledge ("L") is output from the S-35710 Series whenever a 1-byte data is input.

When the data of the wake-up time register or the time register can be read, the data from the S-35710 Series is

output in order of B7 to B0 in byte unit. Input the acknowledge ("L") from the master device whenever a 1-byte data is

input. However, do not input the acknowledge for the last data byte (NO_ACK). By this, the end of the data read is

informed.

After the master device receives / transmits the acknowledge for the last data byte, input the stop condition to the

S-35710 Series to finish the access operation.

When the master device inputs start condition without inputting stop condition at this time, the S-35710 Series

becomes restart condition, and can transmit / receive the data continuously if the master device inputs the slave

address continuously.

A

: Master device input data

: S-35710 output data

Slave address

Slave address

Slave address

Data

Data

Data

Data

A

A

A

A

0

B7

B1

B7

B0

B7

B0

B7

B0

B7

B0

SP

ST

A

Data

Data

Data

A

A

A

1

B7

B0

B7

B0

B7

B0

A

Data

Data

Data

Data

A

A

A

A

0

B7

B0

B7

B0

B7

B0

B7

B0

A

Slave address

Data

Data

Data

A

A

A

1

B7

B1 R/W B7

B0

B7

B0

B7

B0

SP

ST

ST

ST

B7

B1

B7

B1

SP

A

: Start condition

: Acknowledge

A A

: Stop condition

ST

SP

R/W

R/W

R/W

1

9

18

27

36

45

Data write

format

Data read

format

Restart format

SCL

SDA

SDA

SDA

Figure 26 Data Transmission Format of Serial Interface