Temperature sensor communicates over a 1-Wire bus

In addition, the sensor can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply.

The MAX31825 temperature sensor, which is available at distributor Digi-Key provides 8-bit to 12-bit Celsius temperature measurements with better than ±1°C accuracy from 0°C to +70°C and ±1.75°C from -45°C to +145°C.

Each sensor has a unique 64-bit serial code, which allows multiple MAX31825 ICs to reside on the same 1-Wire bus.

In addition, it includes two address input pins that, using an external resistor and pin-strapping, allow one of 64 different addresses to be selected to identify each sensor's physical location.

Therefore, it is simple to use one microprocessor to control many devices distributed over a large area.

The MAX31825 is available in a 6-bump WLP package. The power supply voltage range is from 1.6 V to 3.6 V for external power supplies, and from 2.3 V to 3.6 V for parasite power. The operating temperature range is from -45°C to +145°C