The DS1722 is a digital thermometer with an SPI/3-wire interface. It can measure temperatures from -55°C to +120°C with an accuracy of ±2.0°C and a resolution configurable from 8 to 12 bits (1.0°C to 0.0625°C). Temperature readings can be obtained through a Motorola SPI interface or a standard 3-wire serial interface.
The DS1722 is a digital thermometer and thermostat IC that provides temperature measurements without any external components. It supports a wide analog supply range of 2.65 V‑5.5 V and a separate digital supply of 1.8 V‑5.5 V, and is offered in 8‑pin SO and μMAX packages. The device can communicate over a Motorola SPI bus or a standard 3‑wire serial interface, selectable by the SERMODE pin.
The IC operates in either continuous conversion mode or one‑shot mode, with resolution selectable from 8 to 12 bits (default 9‑bit). Conversion time varies from 0.075 s for 8‑bit to 1.2 s for 12‑bit resolution. Detailed electrical characteristics, timing diagrams, and pin assignments are provided for design integration.
| Temperature range | -55 °C to +120 °C |
|---|---|
| Accuracy | ±2.0 °C |
| Resolution | Configurable 8‑12 bits (default 9‑bit) |
| Analog supply voltage | 2.65 V – 5.5 V |
| Digital supply voltage | 1.8 V – 5.5 V |
| Package options | 8‑Pin SO (150 mil) and 8‑Pin μMAX |
| Conversion time (8‑bit) | 0.075 s |
| Conversion time (12‑bit) | 1.2 s |
| Interface options | Motorola SPI or standard 3‑wire serial |
It measures temperatures from –55 °C to +120 °C.
The thermometer accuracy is ±2.0 °C.
Resolution is set via the configuration register and can be selected from 8, 9, 10, 11, or 12 bits.
The device supports either a Motorola SPI interface or a standard 3‑wire serial interface, selectable by the SERMODE pin.