This document introduces the features and characteristics of the DS1822 digital thermometer, including the 1-Wire® interface, 64-bit serial code, multidrop capability, no external components, data line power supply, temperature range, accuracy, resolution, alarm settings, and application scenarios.
The DS1822 provides 9‑ to 12‑bit centigrade temperature measurements and includes a non‑volatile alarm function. It communicates over a single‑wire bus, allowing many devices to share one data line, and can be powered directly from the data line (parasite power) or an external supply.
Key features include a temperature range of –55 °C to +125 °C, ±2.0 °C accuracy from –10 °C to +85 °C, and configurable resolution. The device contains a unique 64‑bit ROM code for unlimited addressing on the 1‑Wire bus, making it suitable for HVAC, building monitoring, and process control applications.
| Temperature range | -55 °C to +125 °C |
|---|---|
| Accuracy | ±2.0 °C from -10 °C to +85 °C |
| Power supply range | 3.0 V to 5.5 V |
| Conversion time (12‑bit) | 750 ms |
| Conversion time (9‑bit) | 93.75 ms |
The DS1822 can be powered from 3.0 V to 5.5 V.
Yes, it can operate in parasite‑power mode, drawing power from the 1‑Wire data line.
It provides ±2.0 °C accuracy over the range –10 °C to +85 °C.