The Melexis MLX90614ESF-AAA is a high-accuracy, high-resolution, non-contact thermometer with a 90-degree field of view. It has a measurement resolution of 0.02°C and is factory calibrated for a wide -70 to 380°C object temperature range. The sensor uses an SMBus (I²C-compatible) digital interface and can be configured to output a customizable 10-bit PWM output for continuous readings.
The MLX90614 family of sensors use infrared thermopile detectors to determine the temperature of objects without touching them. This sensor can tolerate ambient temperatures from -40 to 85°C and works for object temperatures from -70 to 382.2°C. It provides a measurement resolution of 0.02°C and has an accuracy of ±0.5°C at room temperature. The device comes in a compact TO-39 package that weighs just 0.03 oz (0.9g), and it features filters that give it immunity from ambient IR and sunlight. Please see the MLX90614 datasheet (749k pdf) for more information.
The sensor supports two possible interfaces: SMBus (default) and 10-bit PWM output. The SMBus is completely compatible with I²C (also called TWI) buses for frequencies below 100 kHz and can be used to configure and enable the PWM output if so desired. In addition to the sensor's datasheet, Melexis's application note on MLX90614 SMBus communication (589k pdf) and our application note on interfacing Orangutans with the MLX90614 help demonstrate how to use this sensor. Please note that accurate readings can only be achieved if the sensor is in thermal equilibrium and under isothermal conditions (i.e. there are no temperature differences across the sensor package). The measured object temperature is the average of all objects in the sensor's field of view.
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