S-35740C01A-K8T2U Datasheet, PDF (17/31 Pages) Seiko Instruments Inc – Operation temperature range

FOR AUTOMOTIVE 125°C OPERATION 2-WIRE INTERVAL TIMER CONVENIENCE TIMER
Rev.1.1_00
S-35740 Series
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 at the 2nd byte or subsequent bytes.
The slave address of the S-35740 Series is specified to "0110010". The data can be written to the fixed-cycle
interrupt signal setting register when read / write bit is "0", and the data of the fixed-cycle interrupt signal setting
register or the time register can be read when read / write bit is "1".
When the data can be written to fixed-cycle interrupt signal setting register, input the data from the master device in
order of B7 to B0. The acknowledge ("L") is output from the S-35740 Series whenever a one-byte data is input.
When the data of the fixed-cycle interrupt signal setting register or the timer register can be read, the data from the
S-35740 Series is output in order of B7 to B0 in byte unit. Input the acknowledge ("L") from the master device
whenever a one-byte data is input. However, do not input the acknowledge for the last byte (NO_ACK). By this, the
end of the data read is informed.
After the master device receives / transmits the acknowledge for the last byte data, input the stop condition to the
S-35740 Series to finish the access operation.
When the master device inputs start condition instead of stop condition, the S-35740 Series becomes restart
condition, and can transmit / receive the data if the master device inputs the slave address continuously.
1
9
18
27
36
SCL
Data write
format
SDA ^ST Slave address ^{0 A}
Data
A
Data
A
Data
A SP
B7
B1 R/W B7
B0 B7
B0 B7
B0
Data read
format
SDA _{ST Slave address 1 A}
Data
A
Data
A
Data
A SP
B7
B1 R/W B7
B0 B7
B0 B7
B0
Restart format _{SDA ST Slave address 0 A}
Data
A
Data
A
Data
A
B7
B1 R/W B7
B0 B7
B0 B7
B0
ST _{Slave address} 1 A
B7
B1 R/W B7
: Master device input data
: S-35740 output data
Data
A
B0 B7
Data
A
B0 B7
ST : Start condition
A A A : Acknowledge
Data
A SP
B0
SP : Stop condition
Figure 22 Data Transmission Format of Serial Interface
17