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MLX90614ESF-BCC-000-TU Datasheet(PDF) 27 Page - Melexis Microelectronic Systems |
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MLX90614ESF-BCC-000-TU Datasheet(HTML) 27 Page - Melexis Microelectronic Systems |
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27 / 51 page  MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 3901090614 Page 27 of 52 Data Sheet Rev 009 June 29, 2015 8.7 Computation of ambient and object temperatures The IR sensor consists of serial connected thermo-couples with cold junctions placed at thick chip substrate and hot junctions, placed over thin membrane. The IR radiation absorbed from the membrane heats (or cools) it. The thermopile output signal is: ( ) ( )4 4 , Ta To A To Ta V ir − × = Where To is the absolute object temperature (Kelvin), Ta is the sensor die absolute (Kelvin) temperature, and A is the overall sensitivity. An on board temperature sensor is needed to measure the chip temperature. After measurement of the output of both sensors, the corresponding ambient and object temperatures can be calculated. These calculations are done by the internal DSP, which produces digital outputs, linearly proportional to measured temperatures. 8.7.1 Ambient temperature Ta The Sensor die temperature is measured with a PTAT element. All the sensors conditioning and data processing is handled on-chip and the linearized sensor die temperature Ta is available in memory. The resolution of the calculated temperature is 0.02˚C. The sensor is factory calibrated for the full automotive range -40…+125˚C. The linearized die temperature is available in RAM cell 0x06: - 0x06=0x2DE4 (11748d) corresponds to -38.2˚C (linearization output lower limit) - 0x06=0x4DC4 (19908d) corresponds to +125˚C. (linearization output higher limit) The conversions from RAM contend to real Ta is easy using the following relation: 02 . 0 ] [ × = ° Tareg K Ta , or 0.02°K / LSB. 8.7.2 Object temperature To The result has a resolution of 0.02 ˚C and is available in RAM. To is derived from RAM as: 02 . 0 ] [ × = ° Toreg K To , or 0.02°K / LSB. Please note that 1LSB corresponds to 0,02° and the MSB bit is error flag (if “1” then error). Example: 1. 0x27AD -70.00˚C (no error) 2. 0x27AE -69.98˚C (no error) 3. 0x3AF7 28.75˚C (no error) 4. 0x3AF8 28.77˚C (no error) 5. 0x7FFF 382.19˚C (no error) - maximum possible value returned by MLX90614 6. 0x8XXX xxx.xx˚C (flag error) The result is calculated by following expressions (valid for both To and Ta): 1. Convert it to decimal value i.e. 0x3AF7 = 15095d 2. Divide by 50 (or multiply by 0.02) i.e. 9 . 301 50 15095 = K (result is in Kelvin) 3. Convert K -> ˚C i.e. 301.9 - 273.15 = 28.75˚C |
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