S-35770E01A-K8T2U Datasheet, PDF (5/26 Pages) Seiko Instruments Inc – CONVENIENCE TIMER

Rev.1.2_00
FOR AUTOMOTIVE 125°C OPERATION 2-WIRE COUNTER CONVENIENCE TIMER
S-35770 Series
 Pin Functions
1. SDA (I/O for serial data) pin
This is a data input / output pin for I²C-bus interface. The SDA 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, the SDA pin is pulled
up to V_DD potential via a resistor, and is used with wired-OR connection of other device of Nch open-drain output or
open collector output.
2. SCL (Input for serial clock) pin
This is a clock input pin for I²C-bus interface. The SDA pin inputs / outputs data by synchronizing with this clock
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3. RST (Input for reset signal) pin
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T_{___}h_{_}i_{_}s_{__} pin inputs the reset signal. The counter is reset when inputting "L" to the RST pin. When inputting "H" to the
RST pin, _{_}t_{_}h_{__}e_{__}c_{_} ount-up action of the counter is started.
Also, the RST pin with / without a pull-up resistor can be selected.
4. CLKIN (Input for external clock) pin
This pin inputs an external clock. The counter is incremented by 1 when the CLKIN pin input changes from "L" to "H".
5. LOOP (Output for counter loop flag) pin
Each time the counter loops back to 0 after reaching 16,777,215, the LOOP pin performs a toggle operation.
Regarding the operation of the LOOP pin, refer to " LOOP Pin".
The LOOP pin output form of Nch open-drain output / CMOS output can be selected.
6. VDD (Positive power supply) pin
Connect this pin with a positive power supply. Regarding the values of voltage to be applied, refer to
" Recommended Operation Condition".
7. VSS pin
Connect this pin to GND.
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