X9428WPI datasheet(2/20 Pages) INTERSIL

2 / 20 page

FN8197.0

March 8, 2005

PIN DESCRIPTIONS

Host Interface Pins

Serial Clock (SCL)

The SCL input is used to clock data into and out of the

X9428.

Serial Data (SDA)

SDA is a bidirectional pin used to transfer data into

and out of the device. 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.

Device Address (A0, A2, A3)

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

order

initiate

communication with the X9428. A maximum of 8

devices may occupy the 2-wire serial bus.

Potentiometer Pins

RH/VH, RL/VL

The RH/VH and RL/VL inputs are equivalent to the

terminal connections on either end of a mechanical

potentiometer.

RW/VW

The wiper outputs are equivalent to the wiper output of

a mechanical potentiometer.

Hardware Write Protect Input WP

The WP pin when low prevents nonvolatile writes to

the Data Registers.

Analog Supply V+, V-

The Analog Supply V+, V- are the supply voltages for

the XDCP analog section.

PIN CONFIGURATION

PIN NAMES

Symbol

Description

SCL

Serial clock

SDA

Serial data

A0, A2, A3

Device address

RH/VH, VL/RH Potentiometer Pins

(terminal equivalent)

RW/VW

Potentiometer Pin (wiper equivalent)

Hardware write protection

V+,V-

Analog and voltage follower

VCC

System supply voltage

VSS

System ground

No connection

VCC

RL/VL

SDA

V+

SCL

V-

DIP/SOIC

X9428

VSS

RH/VH

RW/VW

TSSOP

X9428

SDA

VSS

VCC

V+

SCL

V-

X9428

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