Low Noise, Low Power, I2C? Bus, 256 Taps

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 I2C 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.

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

? Pb-free plus anneal product (RoHS compliant)