The ISL90840 is a four-channel digitally controlled potentiometer from Intersil. It is fabricated using CMOS technology and features low noise, low power consumption, I2C bus, and 256 tap points.
The ISL90840 integrates four digitally controlled potentiometers (XDCP) in a single 20‑lead TSSOP package. Each potentiometer offers 256 resistor taps with 0.4 % resolution and can be accessed via a standard I²C (°C) serial interface.
Key features include a power‑on preset to mid‑scale, low standby current (<5 µA), typical wiper resistance of 700 Ω at 3.3 V, and operation over industrial (‑40 °C to +85 °C) and automotive (‑40 °C to +105 °C) temperature ranges. The datasheet details pin assignments, absolute maximum ratings, analog and operating specifications, and timing diagrams for read/write operations.
| Number of potentiometers | 4 |
|---|---|
| Number of taps per potentiometer | 256 |
| Wiper resistance (typical) | 700 Ω @ 3.3 V |
| Supply voltage range | 2.7 V to 5.5 V |
| Standby current | <5 µA max |
| Total resistance options | 10 kΩ or 50 kΩ |
| Package type | 20‑lead TSSOP |
It uses an I²C (°C) serial interface with three address pins, allowing up to eight devices on the bus.
Each potentiometer has 256 taps.
The standby current is less than 5 µA maximum.
The device operates from 2.7 V to 5.5 V.