X9241A

Characteristics subject to change without notice.

2 of 18

REV 1.1.13 12/09/02

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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

X9241A.

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.

Address

The Address inputs are used to set the least

significant 4 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 X9241A.

Potentiometer Pins

connections

on

either

end

of

a

mechanical

potentiometer.

The wiper outputs are equivalent to the wiper output of

a mechanical potentiometer.

PIN CONFIGURATION

PIN NAMES

PRINCIPLES OF OPERATION

The X9241A is a highly integrated microcircuit

incorporating four resistor arrays, their associated

registers and counters and the serial interface logic

providing direct communication between the host and

the XDCP potentiometers.

Symbol

Description

SCL

Serial Clock

SDA

Serial Data

A0–A3

Address

Potentiometer Pins

(terminal equivalent)

Potentiometer Pins

(wiper equivalent)

A0

A2

SDA

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

A1

A3

SCL

DIP/SOIC/TSSOP

X9241A