DATASHEET
X9221A FN8163
Rev 2.00
August 30, 2006 64 Taps, 2-Wire Serial Bus Dual Digitally Controlled Potentiometer (XDCPв„ў)
FEATURES DESCRIPTION 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
—2k, 10k, 50k Resolution: 64 taps each pot 20 Ld plastic DIP and 20 Ld SOIC packages Pb-free plus anneal available (RoHS compliant) 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. …