S-34C02A Datasheet, PDF (8/34 Pages) Seiko Instruments Inc – 2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT

2-WIRE CMOS SERIAL E²PROM FOR DIMM SERIAL PRESENCE DETECT
S-34C02A
Rev.1.2_00
„ Pin Functions
1. A0, A1 and A2 (Address Input) Pins
In the S-34C02A, to set the slave address, connect each pin of A0, A1, A2 to GND or V_CC. Therefore the users can set
8 types of slave address by a combination of A0, A1, A2 pins.
Comparing the slave address transmitted from the master device and one that you set, makes possible to select the S-
34C02A from other devices connected onto the bus.
Be sure to connect to fix the address input pin to GND or V_CC.
2. SDA (Serial Data Input / Output) Pin
The SDA pin is used for the bi-directional transmision of serial data. It consists of a signal input pin and an Nch open
drain output pin.
In use, generally, connect the SDA line to any other device which has the open-drain or open-collector output with
Wired-OR connection by pulling up to V_CC by a resistor.
3. SCL (Serial Clock Input) Pin
The SCL pin is used for the serial clock input. Since the signals are processed at a rising or falling edge of the SCL
clock, pay the attention to the rising and falling time and comply with the specification.
4. WP (Write Protect) Pin
The Write protect function is to inhibit Write in all memory area or in the protect register while this pin is being
connected to V_CC. While the WP pin is being connected to GND or left open, this pin inhibits Write in the first half of
memory (addresses 00h to 7Fh) according to the status of the protect register.
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Seiko Instruments Inc.