DESCRIPTION

   The X9428 integrates a 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.

FEATURES

• Solid state potentiometer

• 2-wire serial interface

• Register oriented format

   —Direct Read/Write/Transfer Wiper Position

   —Store as many as Four Positions per

   Potentiometer

• Power supplies

   —VCC = 2.7V to 5.5V

   —V+ = 2.7V to 5.5V

   —V– = -2.7V to -5.5V

• Low power CMOS

   —Standby current < 1µA

   —Ideal for Battery Operated Applications

• High reliability

   —Endurance–100,000 Data Changes per Bit per

      Register

   —Register Data Retention–100 years

• 4-bytes of nonvolatile memory

• 10kΩ resistor array

• Resolution: 64 taps each potentiometer

• SOIC and TSSOP packages