S-35399A02 Datasheet, PDF (3/55 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

Rev.1.0_00
2-WIRE REAL-TIME CLOCK
S-35399A02
„ Pin Functions
• SDA (I/O for serial data) pin
This pin is to data input/output for I²C-bus interface. This pin inputs/outputs data by synchronizing with a clock pulse
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 I²C-bus interface. The SDA pin inputs/outputs data by synchronizing with the clock
pulse.
• XIN, XOUT (crystal oscillator connect) pin
Connect a crystal oscillator between XIN and XOUT.
• 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, per-minute edge interrupt, minute-periodical interrupt 1, minute-periodical
interrupt 2, or 32.768 kHz output. This pin has Nch open drain output.
• 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, per-minute edge interrupt or minute-periodical interrupt 1. This pin has Nch open
drain output.
• CTRL (F32K output control) pin
This pin is to control output from the F32K pin, has a pull-down resistor. This pin outputs a clock pulse from the F32K pin
when the CTRL pin is in “H”. It does not do so when the CTRL pin is in “L” or open.
Set this CTRL pin to “L” or open at power-on. To output 32.768 kHz from the F32K pin, after power-on, set the CTRL pin
to “H” more than one sec after.
• F32K (32.768 kHz output) pin
This pin has the function to output-control, outputs 32.768 kHz. When the CTRL pin is in “H”, this pin outputs the 32.768
kHz clock pulse, when the CTRL pin is in “L” or open, the status is in high impedance. This pin has Nch open drain
output.
• FOUT (output for clock pulse signal) pin
This pin is to output the clock pulse selected by users. Users can select the frequency by using the FOUT setting
register 1 and 2. This pin outputs “L” at power-on. This pin has CMOS 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”.
• VDDL (positive power supply for FOUT output) pin
This pin is for positive power supply for the FOUT pin’s output. Set the value of voltage to be applied as V_DDL ≤ V_DD.
• VSS pin
Connect this VSS pin to GND.
Seiko Instruments Inc.
3