Part Number : X9221A
Function : Dual Digitally Controlled Potentiometer
Manufacturers : Intersil
The X9221A integrates two 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 2 non volatile Data Registers (DR0:DR1) 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.
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