X9268 datasheet(5/22 Pages) RENESAS

5 / 22 page

X9268

FN8172 Rev.4.00

Page 5 of 22

August 29, 2006

PIN DESCRIPTIONS

Bus Interface Pins

SERIAL DATA INPUT/OUTPUT (SDA)

The SDA is a bidirectional serial data input/output pin for

a 2-Wire slave device and is used to transfer data into

and out of the device. It receives device address,

opcode, wiper register address and data sent from an 2-

Wire master at the rising edge of the serial clock SCL,

and it shifts out data after each falling edge of the serial

clock SCL.

It is an open drain output and may be wire-ORed with

any number of open drain or open collector outputs. An

open drain output requires the use of a pull-up resistor.

For selecting typical values, refer to the guidelines for

calculating typical values on the bus pull-up resistors

graph.

SERIAL CLOCK (SCL)

This input is used by 2-Wire master to supply 2-Wire

serial clock to the X9268.

DEVICE ADDRESS (A3 - A0)

The address inputs are used to set the least significant 3

bits of the 8-bit slave address. A match in the slave

address serial data stream must be made with the

Address input in order to initiate communication with the

X9268. A maximum of 8 devices may occupy the 2-Wire

serial bus.

Potentiometer Pins

RH, RL

The RH and RL pins are equivalent to the terminal

connections on a mechanical potentiometer. Since there

are 2 potentiometers, there are 2 sets of RH and RL

such that RH0 and RL0 are the terminals of POT 0 and

so on.

The wiper pin are equivalent to the wiper terminal of a

mechanical

potentiometer.

Since

there

are

potentiometers, there are 2 sets of RW such that RW0 is

the terminal of POT 0 and so on.

Bias Supply Pins

SYSTEM SUPPLY VOLTAGE (VCC) AND SUPPLY

GROUND (VSS)

The VCC pin is the system supply voltage. The VSS pin

is the system ground.

Analog Supply Voltages (V+ and V

These supplies are the analog voltage supplies for the

potentiometer. The V+ supply is tied to the wiper

switches while the V- supply is used to bias the switches

and the internal P+ substrate of the integrated circuit.

Both of these supplies set the voltage limits of the

potentiometer.

Other Pins

NO CONNECT

No connect pins should be left open. This pins are used

for Intersil manufacturing and testing purposes.

HARDWARE WRITE PROTECT INPUT (WP)

The WP pin when LOW prevents nonvolatile writes to

the Data Registers.

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