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

Applications

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

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party