S-35710B01A-K8T2U Datasheet, PDF (21/33 Pages) Seiko Instruments Inc – Low current consumption

Rev.1.5_00
FOR AUTOMOTIVE 125°C OPERATION 2-WIRE CONVENIENCE TIMER
S-35710 Series
7. Read operation of wake-up time register
Perform the read operation of the wake-up time register with the restart format. Regarding the restart format, refer to
"4. Data transmission format".
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When performing the read operation of the wake-up time register, set the RST pin to "H". If the RST pin is set to "L",
the time register data is read.
Transmit the start condition and the slave address from the master device. The slave address of the S-35710 Series is
specified to "0110010". Next, transmit "0" to the read / write bit.
B7 in the 2nd byte is an address pointer. Set B7 to "0" when reading the wake-up time register. Next, transmit the
dummy data to B6 to B1. Make sure to set B0 to "1" since it is a test bit. This processing is called "dummy write".
Then transmit the start condition, the slave address and the read / write bit. The data of the wake-up time register can
be read when the read / write bit is set to "1".
Consequently, the data of the wake-up time register is output from the S-35710 Series. Each byte from B7 is
transmitted.
When the read operation of the wake-up time register is finished, transmit "1" (NO_ACK) to the acknowledge after B0
output from the master device, and then transmit the stop condition.
The wake-up time register is a 3-byte register. "1" is read if the read operation is performed continuously after reading
3 bytes of the wake-up time register.
Regarding the wake-up time register, refer to " Configuration of Registers".
Moreover, the internal address pointer is reset if recognizing the stop condition. Therefore, do not transmit the stop
condition after dummy write operation. The time register is read if performing the read operation of the register after
transmitting the stop condition.
1
9
18
1
9
18
27
36
SCL
SDA
01100100 0
1
01100101
B7
B1R/W B7
B0
B7
B1R/W B7
Slave address
(0110010)
Dummy data^*1
Slave address
(0110010)
Make sure to set B0 to "1" since it is a test bit.
Set B7 as an address pointer.
B0 B7
B0 B7
B0
Wake-up time register (3-byte)
Input NO_ACK
after
the 3rd byte transmission.
Dummy write
: _{Master device input data}
: _{S-35710 output data}
*1. Set B6 to B1 to "0" or "1" since they are dummy data.
Figure 29 Read Timing of Wake-up Time Register
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