The CAT5409 is four digital POTs integrated with control logic and 16 bytes of NVRAM memory.
A separate 6-bit control register (WCR) independently controls the wiper tap position for each digital POT. 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 2-wire serial bus (I²C-like). 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 (WCR).
The Write Protection (
) pin protects against inadvertent programming of the data register.
The CAT5409 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.

• Four linear-taper digital potentiometers
• 64 resistor taps per potentiometer
• End-to-end resistance 2.5 kΩ, 10 kΩ, 50 kΩ or 100 kΩ
• I
• C Interface
• Low wiper resistance, typically 80 Ω
• Four non-volatile wiper settings for each potentiometer
• Recall of saved wiper settings at power-up
• 2.5 to 6.0 volt operation
• Standby current less than 1 µA
• 1,000,000 nonvolatile WRITE cycles
• 100 year nonvolatile memory data retention
• Write protection for data register