Data Sheet
MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
3901090614 Page 3 of 42 Data Sheet
Rev 004 30/Jul2008
3 Table of Contents
1 Functional diagram......................................................................................................................................................................................1
2 General Description ....................................................................................................................................................................................1
General description (continued).....................................................................................................................................................................2
3 Table of Contents........................................................................................................................................................................................3
4 Glossary of Terms.......................................................................................................................................................................................4
5 Maximum ratings.........................................................................................................................................................................................4
6 Pin definitions and descriptions ..................................................................................................................................................................5
7 Electrical Specifications ..............................................................................................................................................................................6
7.1 MLX90614Axx .....................................................................................................................................................................................6
7.2 MLX90614Bxx , MLX90614Dxx...........................................................................................................................................................8
8 Detailed description...................................................................................................................................................................................10
8.1 Block diagram....................................................................................................................................................................................10
8.2 Signal processing principle................................................................................................................................................................10
8.3 Block description ...............................................................................................................................................................................11
8.3.1 Amplifier .....................................................................................................................................................................................11
8.3.2 Supply regulator and POR .........................................................................................................................................................11
8.3.3 EEPROM....................................................................................................................................................................................11
8.3.4 RAM ...........................................................................................................................................................................................14
8.4 SMBus compatible 2-wire protocol....................................................................................................................................................14
8.4.1 Functional description ................................................................................................................................................................14
8.4.2 Differences with the standard SMBus specification (reference [1]) ...........................................................................................15
8.4.3 Detailed description....................................................................................................................................................................15
8.4.4 AC specification for SMBus .......................................................................................................................................................16
8.4.5 Bit transfer..................................................................................................................................................................................17
8.4.6 Commands.................................................................................................................................................................................18
8.4.7 Sleep Mode................................................................................................................................................................................18
8.5 PWM..................................................................................................................................................................................................20
8.5.1 Single PWM format ....................................................................................................................................................................20
8.5.2 Extended PWM format...............................................................................................................................................................21
8.5.3 Customizing the temperature range for PWM output.................................................................................................................22
8.6 Switching Between PWM and SMBus communication......................................................................................................................23
8.6.1 PWM is enabled.........................................................................................................................................................................23
8.6.2 Request condition ......................................................................................................................................................................23
8.6.3 PWM is disabled ........................................................................................................................................................................23
8.7 Computation of ambient and object temperatures.............................................................................................................................24
8.7.1 Ambient temperature Ta ............................................................................................................................................................24
8.7.2 Object temperature To ...............................................................................................................................................................24
8.7.3 Calculation flow..........................................................................................................................................................................24
8.8 Thermal relay.....................................................................................................................................................................................26
9 Unique Features........................................................................................................................................................................................27
10 Performance Graphs...............................................................................................................................................................................28
10.1 Temperature accuracy of the MLX90614 ........................................................................................................................................28
10.2 Field Of View (FOV) ........................................................................................................................................................................30
11 Applications Information..........................................................................................................................................................................32
11.1 Use of the MLX90614 thermometer in SMBus configuration ..........................................................................................................32
11.2 Use of multiple MLX90614s in SMBus configuration.......................................................................................................................32
11.3 PWM output operation.....................................................................................................................................................................33
11.4 Thermal alert / thermostat ...............................................................................................................................................................33
11.5 High voltage source operation.........................................................................................................................................................34
12 Application Comments ............................................................................................................................................................................35
13 Standard information regarding manufacturability of Melexis products with different soldering processes............................................37
14 ESD Precautions.....................................................................................................................................................................................37
15 FAQ.........................................................................................................................................................................................................38
16 Package Information ...............................................................................................................................................................................40
16.1 MLX90614XXA................................................................................................................................................................................40
16.2 MLX90614XCC................................................................................................................................................................................40
16.3 MLX90614XCF................................................................................................................................................................................41
16.4 Partmarking .....................................................................................................................................................................................41
17 References..............................................................................................................................................................................................42
18 Disclaimer ...............................................................................................................................................................................................42