Digital Thermometer with SPI/3-Wire Interface

 

Part Number	Replacement	Explanation

Description

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The DS1722 Digital Thermometer and Thermostat with SPI/3-Wire Interface provides temperature readings which indicate the temperature of the device. No additional components are required; the device is truly a temperature-to-digital converter. Temperature readings are communicated from the DS1722 over a Motorola SPI interface or a standard 3-wire serial interface. The choice of interface standard is selectable by the user.

For applications that require greater temperature resolution, the user can adjust the readout resolution from 8 to 12 bits. This is particularly useful in applications where thermal runaway conditions must be detected quickly. For application flexibility, the DS1722 features a wide analog supply rail of 2.65V - 5.5V. A separate digital supply allows a range of 1.8V to 5.5V.

The DS1722 is available in an 8-pin SO (150mil) and 8-pin µMAX package.

Applications for the DS1722 include personal computers/servers/workstations, cellular telephones, office equipment, or any thermally-sensitive system.

DS1722: Functional Block Diagram Enlarge+

Key Features

• Temperature Measurements Require No External Components
• Measures Temperatures from -55°C to +120°C. Fahrenheit Equivalent is -67°F to +248°F
• Thermometer Accuracy is ±2.0°C
• Thermometer Resolution is Configurable from 8 to 12 bits (1.0°C to 0.0625°C Resolution)
• Data is Read From/Written to Via a Motorola Serial Peripheral Interface (SPI) or Standard 3-Wire Serial Interface
• Wide Analog Power Supply Range (2.65V - 5.5V)
• Separate Digital Supply Allows for 1.8V Logic
• Available in an 8-Pin SO (150mil) and 8-Pin µMAX package

Applications/Uses

• Cell Phone Base Stations
• Computer Peripherals
• Networking
• Telecommunications
• Test Systems