S35390A datasheet(31/51 Pages) SII

31 / 51 page

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK

Rev.2.2_00

S-35390A H Series

Seiko Instruments Inc.

The followings are data reading / writing in the S-35390A H Series.

3. 1 Data reading in the S-35390A H Series

After detecting a start condition, the S-35390A H Series receives device code and command. The S-35390A H

Series 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-35390A H Series 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 reading. Next, input a stop condition to the S-35390A H Series to

finish access.

SCL

SDA

Device code

+ command

: S-35390A H Series output data

: Master device input data

0 1

R / W

Input NO_ACK after the 1st byte

of data has been output.

1-byte data

Figure 34 Example of Data Reading 1 (1-Byte Data Register)

SCL

SDA

: S-35390A H Series output data

: Master device input data

Input NO_ACK after the 3rd byte of data

has been output.

R / W

3-byte data

Device code

+ command

Figure 35 Example of Data Reading 2 (3-Byte Data Register)

S35390A Datasheet(PDF) 31 Page - Seiko Instruments Inc