The DS1825 digital thermometer provides 9 to 12-bit centigrade temperature measurements and has an alarm function with NV user-programmable upper and lower trigger points. The DS1825 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has a unique 64-bit serial code stored in an on-board ROM, making it ideal for multidrop distributed temperature sensing applications.
The DS1825 provides 9‑ to 12‑bit centigrade temperature measurements and includes non‑volatile alarm registers with user‑programmable upper and lower limits. Each device carries a unique 64‑bit ROM code and a 4‑bit address pin set, allowing up to 16 sensors to be identified on a single 1‑Wire bus.
The thermometer can be powered directly from the 1‑Wire data line (parasite power) or from an external VDD supply. It operates over a temperature range of –55 °C to +125 °C, with ±0.5 °C accuracy between –10 °C and +85 °C. Electrical characteristics, pin functions, memory map and timing diagrams are detailed in the datasheet.
| Supply Voltage (VDD) | 3.0 V to 3.7 V |
|---|---|
| Resolution | 9‑ to 12‑bit selectable |
| Conversion Time (12‑bit) | 750 ms (max) |
| Parasite Power Capability | Can be powered from data line |
| Unique 64‑bit ROM Code | Yes |
| NV EEPROM Write Cycles | 50 k cycles |
| NV EEPROM Data Retention | 10 years |
| Number of Addressable Sensors on Bus | Virtually unlimited (unique 64‑bit code) |
The device operates with a supply voltage between 3.0 V and 3.7 V.
Resolution can be set to 9, 10, 11, or 12 bits.
Yes, it can be powered from the 1‑Wire data line using parasite power.