MAX31820PARMCR+

The MAX31820PARMCR+ is a 1-wire, parasite power ambient temperature sensor in 3 pin TO-92 package. It provides 9bit to 12bit celsius temperature measurements with ±0.5°C accuracy over 10°C to 45°C temperature range. The device communicates over 1-wire bus that and requires only one data line (and ground) for communication with a central microprocessor. In addition, the device derives power directly from data line (parasite power) which eliminates need for an external power supply. The form factor of TO-92 package allows device to be placed above board and thus measures ambient temperature of a system as opposed to board temperature that surface mount package would measure. Each MAX31820PAR has a unique 64bit serial code which allows multiple MAX31820PAR devices to function on same 1-wire bus. It is used in temperature monitoring systems inside buildings, equipment or machinery, thermostatic controls, thermometers and any thermally sensitive system.

• Pull-up supply voltage range from 3V to 3.7V
• ±2°C accuracy over entire -55°C to +125°C operating range
• Minimizes wiring and is ideal for measuring ambient temperature
• Derives power from data line (parasite power), no local power supply needed
• Multidrop capability simplifies distributed temperature sensing applications
• Active current of 1mA, sink current of 4mA and DQ input current of 5μA
• Requires no external components
• User definable non-volatile (NV) alarm settings
• Alarm search command identifies and addresses devices whose temperature is outside programmed limits
• Software compatible with DS1822-PAR and DS18B20-PAR device

Ứng Dụng

Sensing & Instrumentation, Automation & Process Control, Industrial, Consumer Electronics, HVAC

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