EVB90620 Datasheet, PDF (3/39 Pages) Melexis Microelectronic Systems – High precision non-contact temperature measurements

MLX90620
16x4 IR array
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 ....................................................................................................................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 .........................................................................................................14
7.3.3 Calculation of To ..........................................................................................................................16
7.3.4 Example for To calculations .........................................................................................................18
8 Detailed description, Block description ......................................................................................................20
8.1 Pixel position......................................................................................................................................20
8.2 MLX90620 address map ....................................................................................................................21
8.2.1 RAM ............................................................................................................................................21
8.2.2 Internal registers ..........................................................................................................................22
8.2.2.1 Configuration register (0x92) .....................................................................................................22
8.2.2.2 Trimming register (0x93) ...........................................................................................................22
8.2.3 EEPROM.....................................................................................................................................23
8.3 POR...................................................................................................................................................24
8.4 ESD ...................................................................................................................................................24
9 Communication protocol ...........................................................................................................................25
9.1 Communication pins...........................................................................................................................25
9.2 Low level communication protocol ......................................................................................................26
9.2.1 Start / Stop condition....................................................................................................................26
9.2.2 Device addressing .......................................................................................................................26
9.2.3 Acknowledge ...............................................................................................................................26
9.2.4 Low level communication operation..............................................................................................26
9.3 Device modes ....................................................................................................................................27
9.3.1 Normal mode ...............................................................................................................................27
9.4 Communication to IR array.................................................................................................................28
9.4.1 Read command ...........................................................................................................................28
9.4.2 Write configuration register command ..........................................................................................29
9.4.3 Write trimming command .............................................................................................................29
9.5 Communication to EEPROM ..............................................................................................................30
10 Performance Graphs ..............................................................................................................................31
10.1 Temperature accuracy of the MLX90620 ..........................................................................................31
10.2 Field Of View (FOV) .........................................................................................................................32
11 Applications Information..........................................................................................................................33
11.1 Use of the MLX90620 thermometer in SMBus configuration .............................................................33
12 Application Comments ............................................................................................................................33
13 Standard information regarding manufacturability of Melexis products with different soldering processes 35
14 ESD Precautions ....................................................................................................................................35
15 FAQ........................................................................................................................................................36
16 Mechanical specification .........................................................................................................................38
16.1 Package outline................................................................................................................................38
3001090620
Rev 4.0
Page 3 of 40
Datasheet IR16x4
19 September 2012