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MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
3901090614 Page 3 of 52 Data Sheet
Rev 008 February 28, 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 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 Bit transfer ........................................................................................................................................................................ 16
8.4.5 Commands ....................................................................................................................................................................... 17
8.4.6 SMBus communication examples ....................................................................................................................................... 17
8.4.7 Timing specification ........................................................................................................................................................... 18
8.4.8 Sleep Mode....................................................................................................................................................................... 19
8.4.9 MLX90614 SMBus specific remarks.................................................................................................................................... 20
8.5 PWM ....................................................................................................................................................................................... 21
8.5.1 Single PWM format............................................................................................................................................................ 22
8.5.2 Extended PWM format ....................................................................................................................................................... 23
8.5.3 Customizing the temperature range for PWM output ............................................................................................................ 24
8.6 Switching Between PWM / Thermal relay and SMBus communication ......................................................................................... 26
8.6.1 PWM is enabled ................................................................................................................................................................ 26
8.6.2 Request condition.............................................................................................................................................................. 26
8.6.3 PWM is disabled................................................................................................................................................................ 26
8.7 Computation of ambient and object temperatures ....................................................................................................................... 27
8.7.1 Ambient temperature Ta..................................................................................................................................................... 27
8.7.2 Object temperature To ....................................................................................................................................................... 27
8.7.3 Calculation flow ................................................................................................................................................................. 28
8.8 Thermal relay ........................................................................................................................................................................... 30
9 Unique Features.............................................................................................................................................................................. 31
10 Performance Graphs...................................................................................................................................................................... 32
10.1 Temperature accuracy of the MLX90614.................................................................................................................................. 32
10.1.1 Standard accuracy........................................................................................................................................................... 32
10.1.2 Medical accuracy............................................................................................................................................................. 33
10.1.3 Temperature reading dependence on V
DD
......................................................................................................................... 33
10.2 Field Of View (FOV)................................................................................................................................................................ 35
11 Applications Information................................................................................................................................................................. 39
11.1 Use of the MLX90614 thermometer in SMBus configuration ...................................................................................................... 39
11.2 Use of multiple MLX90614s in SMBus configuration.................................................................................................................. 39
11.3 PWM output operation ............................................................................................................................................................ 40
11.4 Thermal alert / thermostat ....................................................................................................................................................... 40
11.5 High voltage source operation ................................................................................................................................................. 41
12 Application Comments ................................................................................................................................................................... 42
13 Standard information regarding manufacturability of Melexis products with different soldering processes ............................................ 44
14 ESD Precautions ........................................................................................................................................................................... 44
15 FAQ.............................................................................................................................................................................................. 45
16 Package Information...................................................................................................................................................................... 47
16.1 MLX90614xxA........................................................................................................................................................................ 47
16.2 MLX90614xCC ....................................................................................................................................................................... 47
16.3 MLX90614xCF ....................................................................................................................................................................... 48
16.4 MLX90614xCH ....................................................................................................................................................................... 48
16.5 MLX90614xCI ........................................................................................................................................................................ 49
16.6 Part marking........................................................................................................................................................................... 49
16.7 Operating and storage humidity range...................................................................................................................................... 49
17 Table of figures.............................................................................................................................................................................. 50
18 References ................................................................................................................................................................................... 51
19 Disclaimer ..................................................................................................................................................................................... 51