Low Noise, Low Power, I2C? Bus, 128 Taps, Wiper Only

The ISL22349 integrates four digitally controlled potentiometers (DCP) and non-volatile memory on a monolithic CMOS integrated circuit.

The digitally controlled potentiometers are implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the I2C bus interface. Each potentiometer has an associated volatile Wiper Register (WR) and a non-volatile Initial Value Register (IVR) that can be directly written to and read by the user. The contents of the WR controls the position of the wiper. At power up the device recalls the contents of the two DCP’s IVR to the corresponding WRs.

特性 Features

? Four potentiometers in one package

? 128 resistor taps

? I2C serial interface

- Three address pins, up to eight devices/bus

? Non-volatile storage of wiper position

? Wiper resistance: 70Ω typical

? Shutdown mode

? Shutdown current 6.5μA max

? Power supply: 2.7V to 5.5V

? 50kΩ or 10kΩ total resistance

? High reliability

- Endurance: 1,000,000 data changes per bit per register

- Register data retention: 50 years @ T < +55°C

? 14 Ld TSSOP

? Pb-free (RoHS compliant)