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S-35390A-T8T1G Datasheet(PDF) 3 Page - Seiko Instruments Inc |
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S-35390A-T8T1G Datasheet(HTML) 3 Page - Seiko Instruments Inc |
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3 / 54 page  2-WIRE REAL-TIME CLOCK Rev.2.4_00 S-35390A Seiko Instruments Inc. 3 Pin Function • SDA (I/O for serial data) pin This pin is to data input/output for I 2C-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 I 2C-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. • 1 INT (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. • 2 INT (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. • 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. Equivalent Circuits of I/O Pin SDA Figure 4 SDA Pin SCL Figure 5 SCL Pin INT1, INT2 Figure 6 INT1 Pin, INT2 Pin |
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