DESCRIPTION
   The CAT5401 is four Digitally Programmable Potentiometers (DPPs™) integrated with control logic and 16 bytes of NVRAM memory. Each DPP consists of a series of 63 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 6-bit control register (WCR) independently controls the wiper tap switches for each DPP. Associated with each wiper control register are four 6-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 four potentiometers is automatically loaded into its respective wiper control register.

FEATURES
◾ Four linear taper digitally programmable
   potentiometers
◾ 64 resistor taps per potentiometer
◾ End to end resistance 2.5kΩ, 10kΩ, 50kΩ or
   100kΩ
◾ Potentiometer control and memory access via
   SPI interface: Mode (0, 0) and (1, 1)
◾ 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