Key facts
- Brand
- Maxim
- Model
- DS18S20
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-08
Start here
Maxim DS18S20 Digital Thermometer Datasheet
The Maxim DS18S20 is a high‑precision 1‑Wire digital thermometer that operates from a single data line and can be powered directly from that line (parasite power) or from an external supply of 3.0 V to 5.5 V. It provides 9‑bit resolution (0.5 °C steps) over a temperature range of –55 °C to +125 °C with ±0.5 °C accuracy between –10 °C and +85 °C.
The datasheet details pin assignments, memory map, command set, timing diagrams, and electrical characteristics. It also describes alarm functionality, power‑supply options, and CRC generation for data integrity, making it suitable for HVAC, industrial monitoring, and consumer temperature‑sensing applications.
Maxim DS18S20 specifications
| Temperature range | -55 °C to +125 °C |
|---|---|
| Resolution | 9‑bit (0.5 °C steps) |
| Accuracy | ±0.5 °C from –10 °C to +85 °C |
| Power supply range | 3.0 V to 5.5 V |
| Conversion time | Maximum 750 ms |
| Parasite power current | up to 1.5 mA during conversion |
All Maxim DS18S20 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What voltage range can power the DS18S20?
The device can be powered from 3.0 V up to 5.5 V, either from the data line (parasite power) or an external supply.
How long does a temperature conversion take?
A temperature conversion requires up to 750 ms to complete.
What is the power supply range for the DS18S20?
The DS18S20 can be powered from 3.0 V up to 5.5 V.
How does parasite power work for the DS18S20?
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.