MLX90615
Infra Red Thermometer
3901090615 Page 3 of 32 Data Sheet
Rev 005 08 November 2013
3 Table of Contents
1 Functional diagram ................................................................................................................................................................................ 1
2 General description................................................................................................................................................................................ 1
3 Table of Contents .................................................................................................................................................................................. 3
4 Glossary of Terms ................................................................................................................................................................................. 4
5 Maximum ratings ................................................................................................................................................................................... 4
6 Pin definitions and descriptions .............................................................................................................................................................. 5
7 Electrical Specification ........................................................................................................................................................................... 6
8 Detailed description ............................................................................................................................................................................... 8
8.1 Block diagram ................................................................................................................................................................................ 8
8.2 Signal processing principle ............................................................................................................................................................. 8
8.3 Block description ............................................................................................................................................................................ 8
8.3.1 Amplifier .................................................................................................................................................................................. 8
8.3.2 Power-On-Reset (POR) .......................................................................................................................................................... 9
8.3.3 EEPROM ................................................................................................................................................................................ 9
8.3.4 RAM...................................................................................................................................................................................... 10
8.4 SMBus compatible 2-wire protocol ............................................................................................................................................... 11
8.4.1 Functional description ........................................................................................................................................................... 11
8.4.2 Differences with the standard SMBus specification (reference [1]) ........................................................................................ 11
8.4.3 Detailed description............................................................................................................................................................... 11
8.4.4 Bit transfer ............................................................................................................................................................................ 13
8.4.5 Commands ........................................................................................................................................................................... 13
8.4.6 SMBus Communication examples ......................................................................................................................................... 14
8.4.7 Timing specification............................................................................................................................................................... 14
8.4.8 Sleep Mode ........................................................................................................................................................................... 15
8.5 Switching between PWM and SMBus ........................................................................................................................................... 16
8.5.1 PWM to SMBus mode ........................................................................................................................................................... 16
8.5.2 SMBus to PWM mode ........................................................................................................................................................... 16
8.6 PWM ............................................................................................................................................................................................ 16
8.6.1 PWM format .......................................................................................................................................................................... 17
8.6.2 Customizing the temperature range for PWM output ............................................................................................................. 17
8.7 Principle of operation .................................................................................................................................................................... 19
8.7.1 Ambient temperature T
A
........................................................................................................................................................ 19
8.7.2 Object temperature T
O
.......................................................................................................................................................... 19
9 Performance Graphs ........................................................................................................................................................................... 20
9.1 Temperature accuracy of the MLX90615 ...................................................................................................................................... 20
9.2 Field Of View (FOV) ..................................................................................................................................................................... 21
10 Applications Information ..................................................................................................................................................................... 23
10.1 Use of the MLX90615 thermometer in SMBus configuration ....................................................................................................... 23
10.2 Use of multiple MLX90615s in SMBus configuration ................................................................................................................... 23
10.3 PWM output ............................................................................................................................................................................... 24
11 Application Comments ....................................................................................................................................................................... 25
12 Standard information regarding manufacturability of Melexis products with different soldering processes .......................................... 26
13 ESD Precautions ............................................................................................................................................................................... 27
14 FAQ ................................................................................................................................................................................................... 27
15 Package Information .......................................................................................................................................................................... 29
16 Part marking ...................................................................................................................................................................................... 29
17 Table of figures .................................................................................................................................................................................. 30
18 References ........................................................................................................................................................................................ 31
19 Disclaimer .......................................................................................................................................................................................... 31