Overview

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 nonvolatile 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.

X9221A Functional Diagram
X9221A Functional Diagram
  • Two XDCPs in one package
  • 2-wire serial interface
  • Register oriented format, 8 registers total
  • Directly write wiper position
  • Read wiper position
  • Store as many as four positions per pot
  • Instruction format
  • Quick transfer of register contents to resistor array
  • Direct write cell
  • Endurance-100,000 writes per bit per register
  • Resistor array values
  • 2kΩ, 10kΩ, 50kΩ
  • Resolution: 64 taps each pot
  • 20 Ld plastic DIP and 20-lead SOIC packages
  • Pb-free plus anneal available (RoHS compliant)

Documentation

Design & Development

Software Downloads
Type Title Date
Library
DCP Evaluation Board Software v6.03
EXE 2.56 MB
1 item

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

    Processing table
    Pkg. Type
    Carrier Type
    MOQ
    Buy / Sample
    Part Number
    X9221AWSIZ
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    memory
    spa
    view_in_ar
    		SOICW Tube 420
    X9221AWSIZT1
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    memory
    spa
    view_in_ar
    		SOICW Reel 1000
    X9221AWSZ
    circleObsolete
    memory
    view_in_ar
    		SOICW Tube 420
    X9221AWSZT1
    circleObsolete
    memory
    view_in_ar
    		SOICW Reel 1000
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