S-35770E01A-K8T2U Datasheet, PDF (17/26 Pages) Seiko Instruments Inc – CONVENIENCE TIMER

Rev.1.2_00
FOR AUTOMOTIVE 125°C OPERATION 2-WIRE COUNTER CONVENIENCE TIMER
S-35770 Series
6. Write operation of free register
Transmit the start condition and slave address from the master device. The slave address of the S-35770 Series is
specified to "0110010". Next, transmit "0" to the read / write bit.
Transmit the 2nd byte data. Set B7 to "1" since it is an address pointer. Set B6 to B1 to "0" or "1" since they are dummy
data. Be sure to set B0 to "1" since it is a test bit.
B7 in the 3rd byte to B3 in the 5th byte are used as the free register.
B2 to B0 (RST2 to RST0) in the 5th byte are used as a register to input the counter reset command. The counter is
reset when transmitting RST2 = "0", RST1 = "1" and RST0 = "0". When not resetting the counter, transmit the data
except for the above mentioned ones, such as RST2 = "1", RST1 = "1" and RST0 = "1".
Transmit the stop condition from the master device to finish the access operation.
Regarding the free register, refer to " Configuration of Registers".
Write operation of the free register is performed each byte, so transmit the data in 3-byte unit. Note that the S-35770
Series may not operate as desired if the data is not transmitted in 3-byte unit.
Disable time period of count-up action
1
9
18
27
36
45
SCL
F[20:13]
Write timing
F[12:5]
Write timing
F[4:0], RST[2:0]
Write timing
SDA
01 10 01 ^{00 1}
1
B7
B1 R/W B7
B0 B7
B0 B7
B0 B7
B0
Slave address
(0110010)
Dummy data^*1
Free register (3-byte)
Make sure to set B0 to "1" since it is a test bit.
Set B7 as an address pointer.
: Master device input data
: S-35770 output data
*1. Set B6 to B1 to "0" or "1" since they are dummy data.
Figure 23 Write Timing of Free Register
17