High-Precision 3-Wire Digital Thermometer and Thermostat

 

Part Number	Replacement	Explanation

Description

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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 (T_HIGH, T_LOW, and T_COM), and overtemperature (T_H) and undertemperature (T_L) user-programmable thresholds stored in on-chip EEPROM. For stand-alone thermostat operation, T_H and T_L 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.

DS1626, DS1726: Functional Diagram Enlarge+

Key Features

• 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

Applications/Uses

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