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datasheet(MLX90640-EN).pdf

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    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 Easy to integrate Industry standard four lead TO39 package Factory calibrated Noise Equivalent Temperature Difference (NETD) 0.1K RMS @1Hz refresh rate I2C compatible digital interface Programmable refresh rate 0.5Hz…64Hz 3.3V supply voltage Current consumption less than 23mA measurements Intrusion / Movement detection Presence detection / Person localization Temperature sensing element for intelligent building air conditioning Thermal Comfort sensor in automotive Air Conditioning control system Microwave ovens Industrial temperature control of moving parts 2 FOV options – 55°x35° and 110°x75° Visual IR thermometers Operating temperature -40°C ÷ 85°C Target temperature -40°C ÷ 300°C Complies with RoHS regulations Driver software for MCU available at: https://github.com/melexis/mlx90640- library.git 3. Description The MLX90640 is a fully calibrated 32x24 pixels thermal IR array in an industry standard 4-lead TO39 package with digital interface. is integrated The MLX90640 contains 768 FIR pixels. An ambient sensor the ambient temperature of the chip and supply sensor to measure the VDD. The outputs of all sensors IR, Ta and VDD are stored in internal RAM and are accessible through I2C. to measure Figure 1 Block diagram
    MLX90640 32x24 IR array Datasheet Contents ............................................................ ................................................................ ................................................................ 1. Features and Benefits ................................ 1. Features and Benefits ............................ 1111 ............................ ................................ ................................ ................................ 1. Features and Benefits 1. Features and Benefits ................................ ................................ ................................ ............................ ............................................................. ................................................................ ................................................................ 2. Application Examples ................................ 2. Application Examples ............................. 1111 ............................. ................................ ................................ ................................ 2. Application Examples 2. Application Examples ................................ ................................ ................................ ............................. ............................................ ................................................................ ................................................................ ................................................................ cription ................................ 3. Description 3. Des ............ 1111 ............ ................................ ................................ ................................ ................................ cription 3. Des 3. Des cription ................................ ................................ ................................ ................................ ............ ............................................................ ................................................................ ................................................................ 4. Ordering Information ................................ 4. Ordering Information ............................ 6666 ............................ ................................ ................................ ................................ 4. Ordering Information 4. Ordering Information ................................ ................................ ................................ ............................ ................................................................ ................................................................ ................................................................ 5. Glossary of Terms ................................ 5. Glossary of Terms ........................................ 7777 ................................ ................................ ................................ ................................ 5. Glossary of Terms 5. Glossary of Terms ................................ ................................ ................................ ................................ ............................................ ................................................................ ................................................................ 6. Pin Definitions and Descriptions ................................ 6. Pin Definitions and Descriptions ............ 8888 ............ ................................ ................................ ................................ 6. Pin Definitions and Descriptions 6. Pin Definitions and Descriptions ................................ ................................ ................................ ............ ................................................... ................................................................ ................................................................ 7. Absolute Maximum Ratings ................................ 7. Absolute Maximum Ratings ................... 8888 ................... ................................ ................................ ................................ 7. Absolute Maximum Ratings 7. Absolute Maximum Ratings ................................ ................................ ................................ ................... ............................................ ................................................................ ................................................................ 8. General Electrical Specifications ................................ 8. General Electrical Specifications ............ 9999 ............ ................................ ................................ ................................ 8. General Electrical Specifications 8. General Electrical Specifications ................................ ................................ ................................ ............ ........................................................... ................................................................ ................................................................ 9. False pixel correction ................................ 9. False pixel correction ........................... 10101010 ........................... ................................ ................................ ................................ 9. False pixel correction 9. False pixel correction ................................ ................................ ................................ ........................... ............................................. ................................................................ ................................................................ 10. Detailed General Description ................................ 10. Detailed General Description ............. 10101010 ............. ................................ ................................ ................................ 10. Detailed General Description 10. Detailed General Description ................................ ................................ ................................ ............. 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 ................................ 11. Calculating Object Temperature ........ 22222222 ........ ................................ ................................ ................................ 11. Calculating Object Temperature 11. Calculating Object Temperature ................................ ................................ ................................ ........ 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 11 – 3 AUGUST 2018 Page 2 of 60
    MLX90640 32x24 IR array Datasheet 11.1.9. Restoring corner temperatures (common for all pixel) .......................................................... 26 11.1.10. Restoring the KsTo coefficient (common for all pixels) ........................................................ 27 11.1.11. Restoring sensitivity correction coefficients for each temperature range ......................... 27 11.1.12. Restoring the Sensitivity ............................................................................................... 28 11.1.13. Restoring the offset of the Compensation Pixel (CP) ........................................................... 28 11.1.14. Restoring the Kv CP coefficient .............................................................................................. 28 11.1.15. Restoring the Kta CP coefficient ............................................................................................ 28 11.1.16. Restoring the TGC coefficient ................................................................................................ 29 11.1.17. Restoring the resolution control coefficient ......................................................................... 29 11.2. Temperature Calculation ................................................................................................................ 30 11.2.1. Example Input Data .................................................................................................................. 30 11.2.2. Temperature calculation .......................................................................................................... 35 .......................................................... ................................................................ ................................................................ 12. Performance graphs ................................ 12. Performance graphs .......................... 47474747 .......................... ................................ ................................ ................................ 12. Performance graphs 12. Performance graphs ................................ ................................ ................................ .......................... 12.1. Accuracy .......................................................................................................................................... 47 Startup time ............................................................................................................................................. 49 12.1.1. First valid data ........................................................................................................................... 49 12.1.2. Thermal behavior...................................................................................................................... 49 12.2. Noise performance and resolution ................................................................................................ 50 12.3. Field of view (FOV) .......................................................................................................................... 52 ..................................................... ................................................................ ................................................................ . Application information ................................ 13131313. Application information ..................... 53535353 ..................... ................................ ................................ ................................ . Application information . Application information ................................ ................................ ................................ ..................... 13.1. Electrical considerations ................................................................................................................ 53 13.2. Using the device in “image mode” ................................................................................................ 54 ...................................................... ................................................................ ................................................................ 14. Application Comments ................................ 14. Application Comments ...................... 54545454 ...................... ................................ ................................ ................................ 14. Application Comments 14. Application Comments ................................ ................................ ................................ ...................... ......................................................... ................................................................ ................................................................ 15. Mechanical drawings ................................ 15. Mechanical drawings ......................... 56565656 ......................... ................................ ................................ ................................ 15. Mechanical drawings 15. Mechanical drawings ................................ ................................ ................................ ......................... 15.1. FOV 55° ............................................................................................................................................ 56 15.2. FOV 110° ......................................................................................................................................... 57 15.3. Device marking ............................................................................................................................... 58 ........................................................ ................................................................ ................................................................ 16. Standard Information ................................ 16. Standard Information ........................ 59595959 ........................ ................................ ................................ ................................ 16. Standard Information 16. Standard Information ................................ ................................ ................................ ........................ ................................................................ ................................................................ ................................................................ ESD Precautions ................................ 17. 17. 17. 17. ESD Precautions .................................... 59595959 ................................ ................................ ................................ ................................ ESD Precautions ESD Precautions ................................ ................................ ................................ ................................ 18. Revision history table ................................ 18. Revision history table ................................................................ ................................................................ ........................................................ ........................ 59595959 ........................ ................................ ................................ ................................ 18. Revision history table 18. Revision history table ................................ ................................ ................................ ........................ .............................................. ................................................................ ................................................................ ................................................................ 19. Contact ................................ 19. Contact .............. 60606060 .............. ................................ ................................ ................................ ................................ 19. Contact 19. Contact ................................ ................................ ................................ ................................ .............. .......................................... ................................................................ ................................................................ ................................................................ 20. Disclaimer ................................ 20. Disclaimer .......... 60606060 .......... ................................ ................................ ................................ ................................ 20. Disclaimer 20. Disclaimer ................................ ................................ ................................ ................................ .......... REVISION 11 – 3 AUGUST 2018 Page 3 of 60
    MLX90640 32x24 IR array Datasheet Tables Table 1 Ordering information .......................................................................................................................................................... 6 Table 2 Glosarry of terms ................................................................................................................................................................ 7 Table 3 Pin definition ...................................................................................................................................................................... 8 Table 4 Absolute maximum ratings ................................................................................................................................................. 8 Table 5 Electrical specification ........................................................................................................................................................ 9 Table 6 Priorities of subpage controls (0x0800D) ............................................................................................................................17 Table 7 Configuration parameters memory ....................................................................................................................................19 Table 8 EEPROM to registers mapping ............................................................................................................................................19 Table 9 EEPROM overview (words) .................................................................................................................................................20 Table 10 Calibration parameters memory (EEPROM - bits) ..............................................................................................................21 Table 11 Calculation example input data ........................................................................................................................................30 Table 12 Calculation example calibration data ................................................................................................................................34 Table 13 XOR truth table ................................................................................................................................................................42 Table 14 Noise performance ..........................................................................................................................................................51 Table 15 Available FOV options ......................................................................................................................................................52 Table 16 Revision history ...............................................................................................................................................................60 Figures Figure 1 Block diagram ................................................................................................................................................................... 1 Figure 2 MLX90640 Overview and pin description ........................................................................................................................... 8 Figure 3 Pixel in the whole FOV ......................................................................................................................................................10 Figure 4 I2C write command format (default SA=0x33 is used) ........................................................................................................11 Figure 5 I2C read command format (default SA=0x33 is used) .........................................................................................................11 Figure 6 Refresh rate timing ...........................................................................................................................................................12 Figure 7 Recommended measurement flow ...................................................................................................................................13 Figure 8 TV mode reading pattern (only highlighted cells are updated) ...........................................................................................15 Figure 9 Chess reading pattern (only highlighted cells are updated) ................................................................................................15 Figure 10 MXL90640 memory map .................................................................................................................................................16 Figure 11 Status register (0x8000) bits meaning .............................................................................................................................16 Figure 12 Control register1 (0x800D) bits meaning .........................................................................................................................17 Figure 13 I2C configuration register (0x800F) bits meaning .............................................................................................................18 Figure 14 RAM memory map (Chess pattern mode) – factory default mode ....................................................................................18 Figure 15 RAM memory map (Interleaved mode) ...........................................................................................................................18 Figure 16 To calculation flow .........................................................................................................................................................35 Figure 17 Absolute temperature accuracy – MLX90640BAA (left) and MLX90640BAB (right) ...........................................................47 Figure 18 Different accuracy zones depending on device type (BAA on the left and BAB on the right) .............................................48 Figure 19 MLX90640BAx noise vs refresh rate for different device types .........................................................................................50 Figure 20 MLX90640BAA noise vs pixel and refresh rate at 1Hz and 2Hz .........................................................................................50 Figure 21 MLX90640BAA noise vs pixel and refresh rate at 4Hz, 8Hz and 16Hz ................................................................................50 Figure 22 MLX90640BAB noise vs pixel and refresh rate at 1Hz and 2Hz .........................................................................................51 Figure 23 MLX90640BAB noise vs pixel and refresh rate at 4Hz, 8Hz and 16Hz ................................................................................51 Figure 24: Field Of View measurement ...........................................................................................................................................52 Figure 25 MLX90640 electrical connections ....................................................................................................................................53 Figure 26 Calculation flow in thermal image mode .........................................................................................................................54 Figure 27 Mechanical drawing of 55° FOV device ............................................................................................................................56 REVISION 11 – 3 AUGUST 2018 Page 4 of 60
    MLX90640 32x24 IR array Datasheet Figure 28 Mechanical drawing of 110° FOV device ..........................................................................................................................57 REVISION 11 – 3 AUGUST 2018 Page 5 of 60
    MLX90640 32x24 IR array Datasheet 4. Ordering Information Product Temperature Package Option Code Custom Configuration Packing Form MLX90640 MLX90640 E E SF SF BAA BAB 000 000 TU TU Definition 32x24 IR array 32x24 IR array Legend: Temperature Code: E: -40°C to 85°C Package Code: “SF” for TO39 package Option Code: xAx – TGC is disabled and may not be changed Option Code: xxA – FOV = 110°x75° xxB – FOV = 55°x35° Custom configuration 000 – standard product Packing Form: “TU” - Tubes Ordering Example: “MLX90640ESF-BAA-000-TU” Table 1 Ordering information REVISION 11 – 3 AUGUST 2018 Page 6 of 60
    MLX90640 32x24 IR array Datasheet 5. Glossary of Terms TC POR IR Ta Temperature Coefficient (in ppm/°C) Power On Reset Infra-Red Ambient Temperature – the temperature of the TO39 package IR data Infrared data (raw data from ADC proportional to IR energy received by the sensor) ADC TGC FOV Analog To Digital Converter Temperature Gradient Coefficient Field Of View nFOV Field Of View of the N-th pixel I2C SDA SCL LSB MSB Fps MD SD ASP DSP ESD EMC CP NC NA TBD Inter-Integrated Circuit communication protocol Serial Data Serial Clock Least Significant Bit Most Significant Bit Frames per Second – data refresh rate Master Device Slave Device Analog Signal Processing Digital Signal Processing Electro Static Discharge Electro Magnetic Compatibility Compensation Pixel Not Connected Not Applicable To Be Defined Table 2 Glosarry of terms REVISION 11 – 3 AUGUST 2018 Page 7 of 60
    MLX90640 32x24 IR array Datasheet 6. Pin Definitions and Descriptions Pin # 1 2 3 4 Name SDA VDD GND SCL Table 3 Pin definition Description I2C serial data (input / output) Positive supply Negative supply (Ground) I2C serial clock (input only) Figure 2 MLX90640 Overview and pin description 7. Absolute Maximum Ratings Parameter Symbol Min. Typ. Max. Unit Remark Supply Voltage (over voltage) Supply Voltage (operating max voltage) Reverse Voltage (each pin) Operating Temperature Storage Temperature ESD sensitivity (AEC Q100 002) SDA DC sink current VDD VDD TAMB TST -40 -40 4 5 3.6 -0.3 +85 +125 V V °C °C kV 40 mA Table 4 Absolute maximum ratings Not in plastic tubes Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. REVISION 11 – 3 AUGUST 2018 Page 8 of 60
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