DS18B20 digital thermometer is a 1-Wire device produced by DALLAS, which has the characteristics of simple circuit and small size. It can be used for temperature measurement, has a unique serial number, does not require external components, has a temperature range of -55℃ to +125℃, users can choose different resolutions, and has temperature upper and lower limit alarm settings.
The DS18B20 is a 1‑Wire digital temperature sensor produced by Dallas. It offers a simple single‑wire connection, unique serial numbers for each device, and built‑in alarm limits. The sensor can measure temperatures from -55 °C to +125 °C with selectable resolution between 9 and 12 bits.
The document describes the three‑pin TO‑92 package (GND, DQ, VDD), details the reset, read and write timing diagrams, and includes a complete C program for the AT89S51 microcontroller that reads the sensor and drives an 8‑digit display. This manual is written in Chinese.
| Temperature range | -55 °C to +125 °C |
|---|---|
| Resolution | 9‑12 bits selectable |
| Unique serial number | Each device has a unique ID |
| Alarm limits | Internal high/low temperature alarms |
It can measure from -55 °C up to +125 °C.
The resolution can be set between 9 and 12 bits.