s-35399a02 Seiko Instruments Inc., s-35399a02 Datasheet - Page 36

• Manufacturer Part Number: s-35399a02
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

36
2-WIRE REAL-TIME CLOCK
S-35399A02
The followings are Read/Write in the S-35399A02.
(1) Data Read in S-35399A02
Read-data mode by the Read/Write bit “1”. The data is output from B7 in 1-byte. Input an acknowledgment signal
from the master device every moment that the S-35399A02 outputs 1-byte data. However, do not input an
acknowledgment signal (input NO_ACK) for the last data-byte output from the master device. This procedure
notifies the completion of Read. Next, input a stop condition to the S-35399A02 to finish access.
After detecting a start condition, the S-35399A02 receives device code and command. The S-35399A02 enters the
SDA
SCL
3-byte data
Code + command
0
1
1
SDA
SCL
1
1-byte data
0
: Input from master device
: Output from S-35399A02
0
Figure 42 Example of Data Read 1 (1-Byte Data Register)
Figure 43 Example of Data Read 2 (3-Byte Data Register)
1
: Input from master device
: Output from S-35399A02
1
Code + command
1
0
R/W
1
1
9
B7
1
0
0
Seiko Instruments Inc.
0
0 1
B0
R/W
B7
9
B7
18
Input NO_ACK after the 1st
byte of data has been output.
B0
B0
Input NO_ACK after the 3rd byte of data
has been output.
18
B7
27
B0
36
Rev.1.0
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