X9111

DATASHEET X9111 Single Supply/Low Power/1024-Tap/SPI Bus/Single Digitally-Controlled (XDCP™) Potentiometer FN8159 Rev 5.00 October 13, 2016 The X9111 integrates a single, digitally controlled potentiometer (XDCP) on a monolithic CMOS integrated circuit. The digital controlled potentiometer is implemented using 1023 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 SPI bus interface. The potentiometer has associated with it a volatile Wiper Counter Register (WCR) and four nonvolatile Data Registers that can be directly written to and read by the user. The contents of the WCR control the position of the wiper on the resistor array through the switches. Power-up recalls the contents of the default data register (DR0) to the WCR. The XDCP can be used as a 3-terminal potentiometer or as a 2-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing. Features 1024 resistor taps – 10-bit resolution SPI serial interface for write, read, and transfer operations of the potentiometer Wiper resistance, 40Ω typical at 5V Four nonvolatile Data Registers Nonvolatile storage of multiple wiper positions Power-on recall, loads saved wiper position on power-up Standby current <3µA maximum VCC: 2.7V to 5.5V operation 100kΩ end-to-end resistance 100-year data ...