CAT5261 Datasheet | Catalyst Semiconductor

.. Dual Digitally Programmable Potentiometers (DPP™) with 256 Taps and SPI Interface 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 100 - 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 - Industrial temperature range For Ordering Information details, see page 14. 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 nonvolatile data registers is via a SPI serial bus. On powerup, the contents of the first data register (DR0) for each of the potentiometers is automatically loaded into its respective wiper control register. The CAT5261 can be used as a potentiometer or as a two terminal, variable resistor. It is intended for circuit level or system level adjustments in a wide variety of applications. It is available in the -40°C to 85°C industrial operating temperature range and offered in a 24-lead SOIC and TSSOP package. PIN CONFIGURATION SOIC/TSSOP (W, Y) SO A0 NC NC NC NC VCC RL0 RH0 1 2...