X9428WPI datasheet(2/20 Pages) XICOR

2 / 20 page

X9428

Characteristics subject to change without notice.

2 of 20

REV 1.1.5 7/8/03

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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 in order to 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–

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