The DS1803 is an addressable device having two independently controlled potentiometers. Each potentiometer's wiper can be set to one of 256 positions. Device control is achieved via a 2-wire serial interface with data I/O and serial clock input.
The DS1803 from Dallas Semiconductor provides two independently controlled 256‑position potentiometers. It operates from a 3 V or 5 V supply and is specified for industrial temperature ranges. The device is addressed via three chip‑select inputs, allowing up to eight devices to share a single 2‑wire serial bus.
The part is offered in 10 kΩ, 50 kΩ and 100 kΩ resistance options and is available in 14‑pin TSSOP, 16‑pin SOIC and 16‑pin DIP packages. Detailed electrical specifications, timing diagrams and command protocols are included for both read and write operations.
| Supply Voltage (Voc) | 5.5 V (typical) |
|---|---|
| Operating Temperature | -40 °C to +85 °C (industrial) |
| Standard Resistance Values | 10 kΩ, 50 kΩ, 100 kΩ |
| Package Options | 14‑Pin TSSOP, 16‑Pin SOIC, 16‑Pin DIP |
| Maximum Number of Devices on Bus | 8 |
| Wiper Resistance (Rw) | 1000 Ω (typical) |
| SCL Clock Frequency (fast mode) | 400 kHz |
| Input Logic High Threshold | 0.7 Vcc |
The DS1803 is specified for an industrial temperature range of –40 °C to +85 °C.
It contains two independently controlled 256‑position digital potentiometers.
Up to eight DS1803 devices can be addressed on a single 2‑wire bus.
The DS1803 is offered with 10 kΩ, 50 kΩ, and 100 kΩ resistance options.