This document describes the features and characteristics of the DS18S20 digital thermometer, including the 1-Wire interface, unique 64-bit serial code, multidrop capability, no need for external components, power supply from data line, temperature measurement range from -55°C to +125°C, accuracy of ±0.5°C, etc.
The DS18S20 is a high‑precision 1‑Wire digital thermometer that measures temperatures from –55 °C to +125 °C with ±0.5 °C accuracy between –10 °C and +85 °C. It offers a unique 64‑bit ROM code for each device, allowing unlimited multidrop sensing on a single bus and can be powered directly from the data line (parasite power) or an external supply.
The document provides ordering information, pin descriptions, memory map, CRC generation, and detailed operating procedures such as temperature conversion, alarm signaling, and power‑supply options. It also includes package drawings, timing diagrams, and revision history for design engineers.
| Temperature range | -55 °C to +125 °C |
|---|---|
| Accuracy | ±0.5 °C from -10 °C to +85 °C |
| Resolution | 9‑bit (0.5 °C steps) |
| Power supply range | 3.0 V to 5.5 V |
| Conversion time (max) | 750 ms |
| Typical conversion current (parasite power) | up to 1.5 mA |
The DS18S20 can be powered from 3.0 V up to 5.5 V.
In parasite‑power mode the device draws power from the 1‑Wire data line when the bus is high, storing charge on an internal capacitor for operation when the bus is low.
It provides 9‑bit resolution, corresponding to 0.5 °C steps.
Each device has a unique 64‑bit serial code, allowing virtually unlimited devices on a single bus.