The X9409 integrates 4 digitally controlled potentiometers

(XDCP) on a monolithic CMOS integrated microcircuit.

The digitally controlled potentiometer is implemented using

63 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 nonvolatile 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

through 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 per package

• 64 resistor taps

• 2-wire serial interface for write, read and transfer operations

of the potentiometer

• 50Ω wiper resistance, typical at 5V

• Four nonvolatile data registers for each potentiometer

• Nonvolatile storage of multiple wiper position

• Power-on recall. Loads saved wiper position on power-up

standby current < 1µA typical

• System VCC: 2.7V operation

• 10kΩ end-to-end resistance

• 100 year data retention

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

• Low power CMOS

• 24 Ld TSSOP

• Pb-free (RoHS compliant)