CAT5259 Datasheet | Catalyst Semiconductor

FEATURES - Four linear taper digitally programmable potentiometers - 256 resistor taps per potentiometer - End to end resistance 50kΩ or 100kΩ - Potentiometer control and memory access via I²C 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 packages - Industrial temperature range For Ordering Information details, see page 15. DESCRIPTION The CAT5259 is four digitally programmable poten- tiometers (DPPs™) integrated with control logic and 16 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 I²C 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 registers. The CAT5259 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 0ºC to 70ºC mercial and -40ºC to 85ºC industrial operating temperature ranges and offered in a 24-lead SOIC and TSSOP package. PIN CONFIGURATION SOIC (W) TSSOP (Y) NC A0 RW3 RH3 RL3 NC VCC RLO RHO 1 2 3 4 5 6 7 8 9 24 A3 23 SCL 22 RL2 21 RH2 20 RW2 19 NC 18 GND 17 RW1 16 RH1 15 RL1 14 A1 13...