The ISL22313 integrates a single digitally controlled

potentiometer (DCP), control logic and non-volatile memory

on a monolithic CMOS integrated circuit.

The digitally controlled potentiometer is 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. The 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 control the position of the

wiper. At power up the device recalls the contents of the

DCP’s IVR to the WR.

The ISL22313 also has 14 general purpose non-volatile

registers that can be used as storage of lookup table for

multiple wiper position or any other valuable information.

The ISL22313 features a dual supply, that is beneficial for

applications requiring a bipolar range for DCP terminals

between V- and VCC.

The DCP can be used as a three-terminal potentiometer or

as a two-terminal variable resistor in a wide variety of

applications including control, parameter adjustments, and

signal processing.

Features

• 256 resistor taps

• I2C serial interface

- Two address pins, up to four devices per bus

• Non-volatile EEPROM storage of wiper position

• 14 General Purpose non-volatile registers

• High reliability

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

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

• Wiper resistance: 70Ω typical @ 1mA

• Standby current <2.5µA max

• Shutdown current <2.5µA max

• Dual power supply

- VCC = 2.25V to 5.5V

- V- = -2.25V to -5.5V

• DCP terminal voltage from V- to VCC

• 10kΩ, 50kΩ or 100kΩ total resistance

• Extended industrial temperature range: -40 to +125°C

• 10 Lead MSOP

Pinout • Pb-free plus anneal product (RoHS compliant)