s-35392a Seiko Instruments Inc., s-35392a Datasheet - Page 3

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

Rev.1.3
Pin Function
Equivalent Circuits of I/O Pin
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This pin is to data input/output for I
SDA (I/O for serial data) pin
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.
SCL (input for serial clock) pin
This pin is to input a clock pulse for I
pulse.
XIN, XOUT (crystal oscillator connect) pin
Connect a crystal oscillator between XIN and XOUT.
32KO (constant output of 32.768 kHz) pin
This is an output pin for 32.768 kHz. This pin constantly outputs a clock pulse after power-on.
This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm
interrupt, output of user-set frequency, per-minute edge interrupt or minute-periodical interrupt 1. This pin has Nch open
drain output.
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”.
VSS pin
Connect this VSS pin to GND.
INT
SDA
2
_00
(output for interrupt signal 2) pin
Figure 2 SDA Pin
2
C-bus interface. This pin inputs/outputs data by synchronizing with a clock pulse
2
C-bus interface. The SDA pin inputs/outputs data by synchronizing with the clock
Figure 4 32KO Pin,
32KO, INT2
Seiko Instruments Inc.
INT
SCL
2
Pin
Figure 3 SCL Pin
2-WIRE REAL-TIME CLOCK
S-35392A
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