DESCRIPTION
The CAT5261 is two Digitally Programmable Potentiometers (DPPs™) integrated with control logic and 8 bytes of NVRAM memory. Each DPP consists of a series of resistive elements connected between two externally accessible end points. The tap points between each resistive element are connected to the wiper outputs with CMOS switches. A separate 8-bit control register (WCR) independently controls the wiper tap switches for each DPP. Associated with each wiper control register are four 8-bit non-volatile memory data registers (DR) used for storing up to four wiper settings. Writing to the wiper control register or any of the non-volatile data registers is via a SPI serial bus. On power-up, the contents of the first data register (DR0) for each of the potentiometers is automatically loaded into its respective wiper control register.

FEATURES
■ Two linear-taper digitally programmable potentiometers
■ 256 resistor taps per potentiometer
■ End to end resistance 50kΩ or 100kΩ
■ Potentiometer control and memory access via SPI interface
■ Low wiper resistance, typically 100Ω
■ Nonvolatile memory storage for up to four wiper settings for each potentiometer
■ Automatic recall of saved wiper settings at power up
■ 2.5 to 6.0 volt operation
■ Standby current less than 1µA
■ 1,000,000 nonvolatile WRITE cycles
■ 100 year nonvolatile memory data retention
■ 24-lead SOIC and 24-lead TSSOP
■ Industrial temperature range