DS1721S+

DS1721S+ is a 2-wire digital thermometer and thermostat. It provides 12-bit temperature readings, which indicate the temperature of the device. Thermostatic settings and temperature readings are all communicated to/from the DS1721 over a simple 2-wire serial interface. No additional components are required; the device is truly a “temperature-to-digital” converter. It has three address bits that allow a user to multidrop up to eight sensors along the 2-wire bus, greatly simplifying the bussing of distributed temperature sensing networks. The thermal alarm output, TOUT, is active when the temperature of the device exceeds a user-defined temperature TH. The output remains active until the temperature is equal to or below the user-defined temperature TL, allowing for any hysteresis necessary. The active state of TOUT is configurable by the user. Applications include personal computers/services, cellular telephones, office equipment, or any microprocessor-based, thermally sensitive system.

• Temperature measurements require no external components with ±1°C accuracy
• Temperature resolution is configurable from 9 to 12 (default) bits (0.5°C to 0.0625°C resolution)
• Maximum conversion time (9-bit resolution) of 93.75 ms
• Thermostatic settings are user-definable
• Data is read/written via a 2-wire serial interface (open drain I/O lines); 3-bit addressability
• Wide power supply range (2.7V - 5.5V)
• Standby current is 0.8µA max at -55°C to +125°C; 2.7V ≤ VDD ≤ 5.5V
• 8-pin SO package
• Measures temperatures from -55°C to +125°C

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