MLX90621
16x4 IR array
3001090621 Page 3 of 46 Datasheet IR16x4
Rev 2.0 02 October 2015
1 Table of contents
1 Table of contents ............................................................................................................................................. 3
2 Glossary of terms ............................................................................................................................................ 5
3 Absolute Maximum ratings .............................................................................................................................. 5
4 Pin definition and description .......................................................................................................................... 6
5 Electrical characteristics .................................................................................................................................. 7
6 Block diagram .................................................................................................................................................. 8
7 Principle of operation ....................................................................................................................................... 9
7.1 Initialization ............................................................................................................................................. 10
7.1.1 Reading configuration ...................................................................................................................... 11
7.2 Read measurement data (RAM data) ..................................................................................................... 12
7.2.1 PTAT data read ................................................................................................................................ 12
7.2.2 IR data read ..................................................................................................................................... 12
7.3 Calculation .............................................................................................................................................. 14
7.3.1 Calculation of absolute chip temperature Ta (sensor temperature) ................................................ 14
7.3.2 Example for Ta calculations ............................................................................................................. 15
7.3.3 Calculation of To .............................................................................................................................. 17
7.3.4 Example for To calculations ............................................................................................................. 20
8 Detailed description, Block description ......................................................................................................... 24
8.1 Pixel position ........................................................................................................................................... 24
8.2 MLX90621 address map ......................................................................................................................... 25
8.2.1 RAM ................................................................................................................................................. 25
8.2.2 Internal registers .............................................................................................................................. 26
8.2.2.1 Configuration register (0x92) ........................................................................................................ 26
8.2.2.2 Trimming register (0x93) ............................................................................................................... 27
8.2.3 EEPROM .......................................................................................................................................... 27
8.3 POR ........................................................................................................................................................ 29
8.4 ESD ......................................................................................................................................................... 29
9 Communication protocol ................................................................................................................................ 30
9.1 Communication pins ............................................................................................................................... 30
9.2 Low level communication protocol .......................................................................................................... 31
9.2.1 Start / Stop condition ........................................................................................................................ 31
9.2.2 Device addressing ............................................................................................................................ 31
9.2.3 Acknowledge .................................................................................................................................... 31
9.2.4 Low level communication operation ................................................................................................. 31
9.3 Device modes ......................................................................................................................................... 32
9.3.1 Normal mode .................................................................................................................................... 32
9.3.2 Step mode ........................................................................................................................................ 32
9.3.3 Power saving mode .......................................................................................................................... 32
9.4 Communication to IR array ..................................................................................................................... 33
9.4.1 Start measurement command .......................................................................................................... 33
9.4.2 Read command ................................................................................................................................ 33
9.4.3 Write configuration register command ............................................................................................. 34
9.4.4 Write trimming command ................................................................................................................. 34
9.5 Communication to EEPROM .................................................................................................................. 35
10 Performance Graphs ................................................................................................................................... 36
10.1 Temperature accuracy of the MLX90621 ............................................................................................. 36
10.2 Noise performance and resolution ........................................................................................................ 37
10.3 Field Of View (FOV) .............................................................................................................................. 38
11 Applications Information .............................................................................................................................. 39
11.1 Use of the MLX90621 thermometer in I
2
C configuration ...................................................................... 39
12 Application Comments ................................................................................................................................ 39
13 Standard information regarding manufacturability of Melexis products with different soldering processes 41
14 ESD Precautions ......................................................................................................................................... 41
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