The document describes a special feature digital thermometer that measures temperatures from -55°C to +100°C in approximately 0.2 seconds. The thermometer has zero standby power, 0.5°C resolution, and the digital temperature reading is the two's complement of the °C value. It can access internal counters to increase resolution through interpolation. The thermometer reduces control, address, data, and power to a single data contact. It also has an 8-bit device-generated CRC for data integrity, an 8-bit family code that specifies DS1920 communications requirements to the reader, and a special command set that allows the user to skip the ROM section and perform temperature measurements simultaneously for all devices on the bus. It has 2 bytes of EEPROM that can be used as alarm triggers or user memory, and the alarm search function directly indicates which device senses alarming temperatures.
The DS1920 Temperature iButton is a digital thermometer that measures temperatures from -55°C to +100°C with a typical resolution of 0.5°C. It operates using a 1-Wire interface and derives power from the data line itself, eliminating the need for a local power source. The device features a unique 64-bit registration number and includes 2 bytes of EEPROM for user memory or alarm triggers.
| Temperature Range | -55°C to +100°C |
|---|---|
| Resolution | 0.5°C |
| Power Source | Parasite power from data line |
| Interface | 1-Wire |
| EEPROM Size | 2 bytes |
| Communication Speed | 16.3k bits per second |
| Conversion Current | 1 mA |
The DS1920 measures temperatures from -55°C to +100°C.
It derives power from the data line itself using parasite power.
The device provides a 0.5°C resolution.
No, it uses parasite power so no local power source is needed for remote sensing.