S-34C02A datasheet(8/34 Pages) SII

8 / 34 page

2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT

S-34C02A

Rev.1.2_00

Seiko Instruments Inc.

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 VCC. 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 VCC.

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 VCC 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 VCC. 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.

S-34C02A Datasheet(PDF) 8 Page - Seiko Instruments Inc