S-34C02A Datasheet, PDF (10/34 Pages) Seiko Instruments Inc – 2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT

2-WIRE CMOS SERIAL E²PROM FOR DIMM SERIAL PRESENCE DETECT
S-34C02A
Rev.1.2_00
3. Data Transmission
Data is transmitted by changing the SDA line while the SCL line is “L”.
If the SDA line changes while the SCL line is “H”, the S-34C02A goes in the start or stop condition status.
t_SU.DAT
t_HD.DAT
SCL
SDA
(in)
Figure 7 Data Transmission Timing
4. Acknowledgment
Data is transmitted sequentially in 8-bit. Changing the SDA line to “L” indicates that the devices on the system bus
have received data, thus the devices send an acknowledgment signal back during the 9th clock of cycle.
The S-34C02A does not send an acknowledgment signal back during the Write operation.
SCL
1
8
9
SDA
(in)
SDA
(out)
Start Condition
Figure 8 Acknowledgment Output Timing
Acknowledgement
Output
t_AA
t_DH
10
Seiko Instruments Inc.