S-35390A Seiko Instruments, S-35390A Datasheet - Page 27

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

Rev.1.2
(S-35390A output)
(S-35390A input)
4. Acknowledge
5. Data reading
(Master output)
Data is transferred 8 bits in a row. Subsequently, in the 9th clock cycle period, the device on the system
bus that is receiving the data changes the SDA line to “L” and returns the acknowledge signal to
acknowledge data reception.
After detecting the start condition from outside, a device code and command are received. If the read/write
bit is “1” at this point, the data read mode is entered. The data output sequence is output from the LSB.
SDA
SCL
SDA
_00
Start condition
Figure 25 Timing of Acknowledge Output
1
Seiko Instruments Inc.
8
2-WIRE REAL-TIME CLOCK
Acknowledge
output
t
PD
9
S-35390A
t
DH
27