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

S-35390A H Series

Seiko Instruments Inc.

5

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Pin Functions

1. SDA (I/O for serial data) pin

This is a data input / output pin of I

from the SCL pin. This pin has CMOS input and Nch open-drain output. Generally in use, pull up this pin to the VDD

potential via a resistor, and connect it to any other device having open drain or open collector output with wired-OR

connection.

2. SCL (input for serial clock) pin

This pin is to input a clock pulse for I

clock pulse.

3. XIN, XOUT (crystal oscillator connect) pins

Connect a crystal oscillator between XIN and XOUT.

4.

INT1 (output for interrupt signal 1) pin

This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm 1

interrupt, output of user-set frequency, minute-periodical interrupt 1, minute-periodical interrupt 2, or 32.768 kHz output.

This pin has Nch open-drain output.

5. INT2 (output for interrupt signal 2) pin

This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm 2

interrupt, output of user-set frequency, or minute-periodical interrupt 1. This pin has Nch open-drain output.

6. VDD (positive power supply) pin

Connect this VDD pin with a positive power supply. Regarding the values of voltage to be applied, refer to

" Recommended Operation Conditions".

7. VSS pin

Connect this VSS pin to GND.

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Equivalent Circuits of Pins

SDA

Figure 4 SDA Pin

SCL

Figure 5 SCL Pin

INT1, INT2

Figure 6 INT1 Pin, INT2 Pin