The DS1631, DS1631A, and DS1731 digital thermometers provide 9, 10, 11, or 12-bit temperature readings over a -55°C to +125°C range. The DS1631 and DS1631A thermometer accuracy is �0.5°C from 0°C to +70°C with 3.0V � VDD � 5.5V, and the DS1731 accuracy is �1°C from -10°C to +85°C with 3.0V � VDD � 5.5V. The thermostat on all three devices provides custom hysteresis with user-defined trip points (TH and TL).
The Maxim DS1631 family (DS1631, DS1631A, DS1731) are high‑precision digital thermometers and thermostats that communicate via a 2‑wire serial interface. They offer selectable resolution (9‑12 bits), wide supply voltage (2.7 V‑5.5 V) and operate over a temperature range of –55 °C to +125 °C.
The document provides ordering information, pin descriptions, electrical characteristics, register maps and example operation sequences for continuous‑conversion and one‑shot modes, as well as EEPROM specifications for non‑volatile configuration.
| Accuracy (DS1631/DS1631A) | ±0.5 °C (0 °C to +70 °C) |
|---|---|
| Operating Temperature Range | –55 °C to +125 °C |
| Supply Voltage (Vop) | 2.7 V to 5.5 V |
| SCL Clock Frequency | up to 400 kHz |
| Multidrop Capability | Up to 8 devices on the same 2‑wire bus |
| EEPROM Write Cycle Time | 4 ms – 10 ms |
The devices measure from –55 °C up to +125 °C.
It operates from 2.7 V to 5.5 V.