MLX90632 FIR sensor Datasheet Features and Benefits Application Examples Small size of 3x3mm High precision non-contact temperature measurements Easy to integrate Body temperature measurement Factory calibrated Non-contact thermometer for mobile and External ambient and object temperature IoT application calculation Temperature sensing element for Standard measurement resolution 0.02C residential, commercial and industrial Medical measurement resolution 0.01C building air conditioning Supply voltage of 3.3V, supply current Industrial temperature control of moving 1mA (sleep current less than 2.5uA) parts 2 I C compatible digital interface Home appliances with temperature 2 control Software definable I C address with 1 LSB bit external address pin Healthcare Field of View of 50 Livestock monitoring Default refresh rate 0.5s, configurable MLX90632 FIR sensor Datasheet Description The MLX90632 is a non-contact infrared temperature sensor in a small SMD SFN package. The device is factory calibrated with calibration constants stored in the EEPROM memory. The ambient and object temperature can be calculated externally based on these calibration constants and the measurement data. A major strength of the MLX90632 is that these temperature differences around the sensor package will be reduced to a minimum. However, some extreme cases will influence the sensor. The accuracy of the thermometer can be influenced by temperature differences in the package induced by causes like (among others): hot electronics behind the sensor, heaters/coolers behind or beside the sensor or by a hot/cold object very close to the sensor that not only heats the sensing element in the thermometer but also the thermometer package. In the same way, localized thermal variations -like turbulence in the air- will not generate thermal noise in the output signal of the thermopile. The MLX90632 is available in two different versions: standard and medical accuracy. Both versions are calibrated in the ambient temperature range from -20 to 85C. The difference between both versions is visible in accuracy and the object temperature range. The medical version is factory calibrated with an accuracy of 0.2C within the narrow object temperature range from 35 to 42C for medical applications. This version also allows Extended range operation. This measurement type option is implemented in order to give additional range to the medical devices. The object temperature range is limited from -20 to 100C. For more information see Section 11.2. On the other hand, the standard version covers an object temperature range from -20 to 200C but offers an accuracy of 1C. It is very important for the application designer to understand that these accuracies are guaranteed and achievable when the sensor is in thermal equilibrium and under isothermal conditions (no temperature differences across the sensor package). 2 The typical supply voltage of the MLX90632 is 3.3V. For the I C communication with the master microcontroller, 2 two versions of the sensor are available, working either at 3.3V or 1.8V I C reference voltage. 2 The communication to the chip is done by I C in fast mode plus (FM+). 2 Through I C the external microcontroller has access to the following blocks: RAM memory used for measurement data, in this document mainly referred to as storage memory EEPROM used to store the trimming values, calibration constants and device/measurement settings Based on this data, the external microcontroller can calculate the object temperature and if needed the sensor temperature. An optical filter (long-wave pass) that cuts off the visible and near infra-red radiant flux is integrated in the sensor to provide ambient light immunity. The wavelength pass band of this optical filter is from 2 till 14m.