The ISL22346 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

I

2C 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.

The DCPs can be used as a three-terminal potentiometers

or as a two-terminal variable resistors in a wide variety of

applications including control, parameter adjustments, and

signal processing.

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 @ 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

• 20 Ld TSSOP or 20 Ld TQFN package

• Pb-free (RoHS compliant)