S-35390A Seiko Instruments, S-35390A Datasheet - Page 8

• Manufacturer Part Number: S-35390A
• Description: 2-Wire Real Time Clock
• Manufacturer: Seiko Instruments

8
2-WIRE REAL-TIME CLOCK
S-35390A
1. Communication data configuration
Timing Chart
Operation
The master device on the system generates a start condition to the slave device to communicate. Then it
The higher 4 bits that indicate the device address are called the device code and are fixed to “0110”.
Refer to “Serial Interface”.
transmits a 4-bit device address, 3-bit command, and 1-bit read/write command on the SDA bus.
SDA OUT
SDA IN
SCL
MSB
0
Device code
t
1
SU.STA
1
t
HD.STA
0
Figure 7 Communication Data
t
F
t
PD
Figure 6 Bus Timing
Seiko Instruments Inc.
C2
t
t
HIGH
HD.DAT
Command
C1
t
LOW
C0
t
SU.DAT
Read/write bit
R/W
Acknowledge bit
ACK
LSB
t
R
t
SU.STO
t
BUF
Rev.1.2
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