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

The ISL22326 integrates two digitally controlled potentiometers (XDCP) 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

? Two 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 @ VCC = 3.3V

? Shutdown mode

? Shutdown current 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 or 16 Ld QFN package

? Pb-free (RoHS compliant)