High-Precision 3-Wire Digital Thermometer and Thermostat

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, in the full data sheet, summarizes the user-accessible registers. Figure 1, in the full data sheet, shows a functional diagram.

Applications

* Any Space-Constrained Thermally Sensitive Application * Consumer Products * Industrial Controls * Thermostatic Controls

* Temperature Measurements Require No External Components

* Measure Temperatures from -55°C to +125°C (-67°F to +257°F)

* DS1626: ±0.5°C Accuracy from 0°C to +70°C

* DS1726: ±1°C Accuracy from -10°C to +85°C

* Output Resolution is User Selectable to 9, 10, 11, or 12 Bits

* Wide Power-Supply Range (2.7V to 5.5V)

* Convert Temperature to Digital Word in 750ms (max)

* Stand-Alone Thermostat Capability

* Thermostatic Settings are User Definable and Nonvolatile (NV)

* Data is Read/Written Through a 3-Wire Serial Interface

* Available in 8-Pin µSOP Package