X9259 Datasheet | Xicor

APPLICATION NOTES AND DEVELOPMENT SYSTEM A V A I L A B L E AN99 - AN115 - AN124 - AN133 - AN134 - AN135 Single Supply / Low Power / 256-tap / 2-Wire bus Quad Digitally-Controlled (XDCPTM) Potentiometers Features - Quad- Four separate potentiometers - 256 resistor taps/pot- 0.4% resolution - 2-Wire Serial Interface for write, read, and transfer operations of the potentiometer - Wiper Resistance, 100Ω typical @ VCC = 5V - 4 Nonvolatile Data Registers for Each Potentiometer - Nonvolatile Storage of Multiple Wiper Positions - Power On Recall. Loads Saved Wiper Position on Power Up. - Standby Current < 5µA Max - VCC: 2.7V to 5.5V Operation - 50KΩ, 100KΩ versions of End to End Pot Resistance - Endurance: 100,000 Data Changes per Bit per Register - 100 yr. Data Retention - Single Supply Version of X9258 - 24-Lead SOIC, 24-Lead TSSOP, 24-Lead XBGA - Low Power CMOS DESCRIPTION The X9259 integrates 4 digitally controlled potentiometer (XDCP) on a monolithic CMOS integrated circuit. The digital controlled potentiometer is implemented using 255 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 a four nonvolatile Data Registers 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 though the switches. Powerup recalls the contents of the default Data Register (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. FUNCTIONAL DIAGRAM RH0 RH1 RH2 RH3...