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The X9258 integrates 4 digitally controlled potentiometers

(XDCP?) on a monolithic CMOS integrated circuit.

The digitally controlled potentiometer is implemented using

255 resistive elements in a series array. Between each

element are tap points connected to the wiper terminal

through switches. The position of the wiper on the array is

controlled by the user through the 2-wire bus interface. Each

potentiometer has associated with it a volatile Wiper Counter

Register (WCR) and 4 non-volatile Data Registers

(DR0:DR3) that can be directly written to and read by the

user. The contents of the WCR controls the position of the

wiper on the resistor array though the switches. Power-up

recalls the contents of DR0 to the WCR.

The XDCP? can be used as a three-terminal potentiometer

or as a two-terminal variable resistor in a wide variety of

applications including control, parameter adjustments, and

signal processing.

Features

? Four potentiometers in one package

? 256 resistor taps/potentiometer................. 0.4 resolution

? 2-wire serial interface

? Wiper resistance, 40? typical @ V+ = 5V, V- = -5V

? Four nonvolatile data registers for each potentiometer

? Nonvolatile storage of wiper position

? Standby current <5μA max (total package)

? Power supplies

- VCC = 2.7V to 5.5V

- V+ = 2.7V to 5.5V

- V- = -2.7V to -5.5V

? 100k?, 50k? total potentiometer resistance

? High reliability

- Endurance: 100,000 data changes per bit per register

- Register data retention . . . . . . . . . . . . . . . . . . 100 years

? 24 Ld SOIC, 24 Ld TSSOP

? Dual supply version of X9259

? Pb-free (RoHS compliant)