The DS1626 and DS1726 digital thermometers/thermostats provide temperature measurements and stand-alone thermostat capability over a -55°C to +125°C range. The DS1626 offers ±0.5°C accuracy from 0°C to +70°C and the DS1726 has ±1°C accuracy from -10°C to +85°C. The resolution of the measured temperature is user selectable from 9 to 12 bits. Communication with the DS1626 and DS1726 is achieved through a 3-wire serial bus. The DS1626 and DS1726 offer thermostatic functionality with three dedicated thermostat outputs (THIGH, TLOW, and TCOM), and overtemperature (TH) and undertemperature (TL) user-programmable thresholds stored in on-chip EEPROM. For stand-alone thermostat operation, TH and TL can be programmed prior to installation, and the DS1626/DS1726 can be configured to automatically begin taking temperature measurements at power-up. Table 1 summarizes the user-accessible registers. Figure 1 shows a functional diagram.
The DS1626 and DS1726 are digital thermometers and thermostats that provide temperature measurement and stand‑alone thermostat capability over a -55 °C to +125 °C range. Accuracy is ±0.5 °C for the DS1626 (0 °C‑+70 °C) and ±1 °C for the DS1726 (-10 °C‑+85 °C). Users can select a resolution of 9, 10, 11, or 12 bits, and the devices communicate via a 3‑wire serial bus.
The datasheet includes pin configuration, register maps, absolute maximum ratings, electrical characteristics, EEPROM specifications, operation modes (continuous, one‑shot, and stand‑alone thermostat), configuration register details, and the full command set. Package information and ordering details are also provided.
| Temperature measurement range | -55 °C to +125 °C |
|---|---|
| DS1626 accuracy | ±0.5 °C (0 °C to +70 °C) |
| DS1726 accuracy | ±1 °C (-10 °C to +85 °C) |
| Resolution options | 9, 10, 11, or 12 bits |
| Supply voltage range | 2.7 V to 5.5 V |
| Maximum conversion time (12‑bit) | 750 ms |
| EEPROM write cycle time | 4‑10 ms |
| Thermostat outputs | Three dedicated outputs (T HIGH, T LOW, T COM) |
It measures temperatures from –55 °C up to +125 °C.
The devices operate with a supply voltage between 2.7 V and 5.5 V.
Resolution can be set to 9, 10, 11, or 12 bits.
The three thermostat outputs (T HIGH, T LOW, T COM) are programmable via EEPROM‑stored high‑ and low‑temperature thresholds.