X9438 Datasheet, PDF(2/18 Page) Intersil Corporation – Dual Digitally Controlled Potentiometer (XDCP) with Operational Amplifier

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X9438 Datasheet, PDF (2/18 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometer (XDCP) with Operational Amplifier

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X9438

PIN DESCRIPTIONS

Host Interface Pins

Serial Clock (SCL)

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

X9438.

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.

Device Address (A0 - A3)

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 X9438. A maximum of 16 devices may share the

same 2-wire serial bus.

Potentiometer Pins(1)

RH (RH0 - RH1), RL (RL0 - RL1)

The RH and RL inputs are equivalent to the terminal con-

nections on either end of a mechanical potentiometer.

RW (RW0 - RW1)

The wiper output is equivalent to the wiper output of a

mechanical potentiometer.

Amplifier and Device Pins

Amplifier Input Voltage VNI(0,1) and VINV(0,1)

VNI and VINV are inputs to the noninverting (+) and

inverting (-) inputs of the operational amplifiers.

Amplifier Output Voltage VOUT(0,1)

VOUT is the voltage output pin of the operational

amplifier.

Hardware Write Protect Input WP

The WP pin, when low, prevents non-volatile writes to

the wiper counter registers.

Note: (1) Alternate designations for RH, RL, RW are VH, VL, VW

Analog Supplies V+, V-

The analog supplies V+, V- are the supply voltages for

the XDCP analog section and the operational amplifiers.

System Supply VCC and Ground VSS.

The system supply VCC and its reference VSS is used

to bias the interface and control circuits.

PIN CONFIGURATION

VCC

RL0

RH0

RW0

SDA

RL1

RH1

RW1

VSS

SOIC

7 X9438 18

V+

VOUT0 A0

VNI0 VINV0

VINV0 VNI0

A0 VOUT0

V+

SCL

VCC

RL0

VINV1

VNI1

RH0

RW0

VOUT1

V-

TSSOP

X9438

SCL

VINV1

VNI1

VOUT1

V-

VSS

RW1

RH1

RL1

SDA

PIN NAMES

Symbol

SCL

SDA

A0 - A3

RH0 - RH1,

RL0 - RL1

RW0 - RW1

VNI(0,1),

VINV(0,1)

VOUT0, VOUT1

V+,V-

VCC

VSS

Description

Serial Clock

Serial Data

Device Address

Potentiometers (terminal equivalent)

Potentiometers (wiper equivalent)

Amplifier Input Voltages

Amplifier Outputs

Hardware Write Protection

Analog and Voltage Amplifier Supplies

System/Digital Supply Voltage

System Ground

No Connection

FN8199.0

March 11, 2005

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