s-35392a Seiko Instruments Inc., s-35392a Datasheet - Page 29

• Manufacturer Part Number: s-35392a
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

Rev.1.3
The followings are Read/Write in the S-35392A.
(1) Data Read in S-35392A
After detecting a start condition, the S-35392A receives device code and command. The S-35392A enters the
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-35392A 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-35392A to finish access.
SDA
_00
SCL
3-byte data
Device code + command
0
1
1
SDA
SCL
1
1-byte data
0
: Input from master device
: Output from S-35392A
0
Figure 30 Example of Data Read 1 (1-Byte Data Register)
Figure 31 Example of Data Read 2 (3-Byte Data Register)
Device code + command
1
: Input from master device
: Output from S-35392A
1
1
0
R/W
1
9
1
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
18
Input NO_ACK after the 3rd byte of
data has been output.
B7
27
2-WIRE REAL-TIME CLOCK
B0
36
S-35392A
29