X9221

APPLICATION NOTES A V A I L A B L E AN20 AN42 AN44–48 AN50 AN52 AN53 AN73 Advance Information X9221 Terminal Voltage ±5V, 64 Taps X9221 Dual E2POT™ Nonvolatile Digital Potentiometer FEATURES DESCRIPTION The X9221 integrates two nonvolatile E2POT™ digitally controlled potentiometers on a monolithic CMOS microcircuit. The X9221 contains two resistor arrays, each composed of 63 resistive elements. Between each element and at either end are tap points accessible to the wiper elements. The position of the wiper element on the array is controlled by the user through the two-wire serial bus interface. Each resistor array has associated with it a wiper counter register and four 8-bit data registers that can be directly written and read by the user. The contents of the wiper counter register control the position of the wiper on the resistor array. The data register may be read or written by the user. The contents of the data registers can be transferred to the wiper counter register to position the wiper. The current wiper position can be transferred to any one of its associated data registers. Two in One Package Two-Wire Serial Interface Register Oriented Format —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 Low Power CMOS Direct Write Cell —Endurance - 100,000 Writes per Register —Register Data Retention - 100 years 8 Bytes of ...