SEN-14843 SparkFun

MLX90640 32x24 IR array Datasheet 1. Features and Benefits 2. Application Examples Small size, low cost 32x24 pixels IR array High precision non-contact temperature measurements Easy to integrate Intrusion / Movement detection Industry standard four lead TO39 package Presence detection / Person localization Factory calibrated Temperature sensing element for Noise Equivalent Temperature Difference intelligent building air conditioning (NETD) 0.1K RMS 1Hz refresh rate Thermal Comfort sensor in automotive Air 2 I C compatible digital interface Conditioning control system Programmable refresh rate 0.5Hz64Hz Microwave ovens 3.3V supply voltage Industrial temperature control of moving Current consumption less than 23mA parts 2 FOV options 55x35 and 110x75 Visual IR thermometers Operating temperature -40C 85C Driver software for MCU available at: MLX90640 32x24 IR array Datasheet Contents 1. Features and Benefits ............................................................................................................................ 1 2. Application Examples ............................................................................................................................. 1 3. Description ............................................................................................................................................ 1 4. Ordering Information ............................................................................................................................ 6 5. Glossary of Terms .................................................................................................................................. 7 6. Pin Definitions and Descriptions ............................................................................................................ 8 7. Absolute Maximum Ratings ................................................................................................................... 8 8. General Electrical Specifications ............................................................................................................ 9 9. False pixel correction ........................................................................................................................... 10 10. Detailed General Description ............................................................................................................. 10 10.1. Pixel position ................................................................................................................................... 10 10.2. Communication protocol ............................................................................................................... 11 10.2.1. Low level ................................................................................................................................... 11 10.3. Measurement mode ....................................................................................................................... 12 10.4. Refresh rate ..................................................................................................................................... 12 10.5. Measurement flow ......................................................................................................................... 13 10.6. Reading patterns ............................................................................................................................. 14 10.7. Address map ................................................................................................................................... 16 10.7.1. Internal registers....................................................................................................................... 16 10.7.2. RAM ........................................................................................................................................... 18 10.7.3. EEPROM .................................................................................................................................... 19 11. Calculating Object Temperature ........................................................................................................ 22 11.1. Restoring calibration data from EERPOM ..................................................................................... 22 11.1.1. Restoring the VDD sensor parameters .................................................................................... 22 11.1.2. Restoring the Ta sensor parameters ....................................................................................... 22 11.1.3. Restoring the offset .................................................................................................................. 23 11.1.4. Restoring the Sensitivity .................................................................................................. 24 11.1.5. Restoring the Kv(i,j) coefficient ................................................................................................ 25 11.1.6. Restoring the Kta(i,j) coefficient .............................................................................................. 25 11.1.7. Restoring the GAIN coefficient (common for all pixels) ......................................................... 26 11.1.8. Restoring the KsTa coefficient (common for all pixels) .......................................................... 26 REVISION 12 DECEMBER 3, 2019 Page 2 of 60 3901090640