EVB90615 Datasheet, PDF(3/30 Page) Melexis Microelectronic Systems

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

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 ....................................................................................................................................................10

8.4.1 Functional description ................................................................................................................................................................10

8.4.2 Differences with the standard SMBus specification (reference [1]) ...........................................................................................11

8.4.3 Detailed description....................................................................................................................................................................11

8.4.4 AC specification for SMBus .......................................................................................................................................................13

8.4.5 Bit transfer..................................................................................................................................................................................14

8.4.6 Commands.................................................................................................................................................................................14

8.4.7 Sleep Mode ................................................................................................................................................................................14

8.5 Switching between PWM and SMBus ...............................................................................................................................................15

8.5.1 PWM is enabled .........................................................................................................................................................................15

8.5.2 Request condition ......................................................................................................................................................................16

8.5.3 PWM is disabled ........................................................................................................................................................................16

8.6 PWM..................................................................................................................................................................................................17

8.6.1 PWM format ...............................................................................................................................................................................17

8.6.2 Customizing the temperature range for PWM output.................................................................................................................18

8.7 Principle of operation.........................................................................................................................................................................19

8.7.1 Ambient temperature Ta ............................................................................................................................................................19

8.7.2 Object temperature To ...............................................................................................................................................................19

9 Unique Features........................................................................................................................................................................................20

10 Performance Graphs...............................................................................................................................................................................20

10.1 Temperature accuracy of the MLX90615 ........................................................................................................................................20

10.2 Field Of View (FOV) ........................................................................................................................................................................21

11 Applications Information..........................................................................................................................................................................22

11.1 Use of the MLX90615 thermometer in SMBus configuration ..........................................................................................................22

11.2 Use of multiple MLX90615s in SMBus configuration.......................................................................................................................22

11.3 PWM output.....................................................................................................................................................................................23

12 Application Comments ............................................................................................................................................................................24

13 Standard information regarding manufacturability of Melexis products with different soldering processes............................................25

14 ESD Precautions.....................................................................................................................................................................................26

15 FAQ.........................................................................................................................................................................................................26

16 Package Information ...............................................................................................................................................................................28

17 References..............................................................................................................................................................................................29

18 Disclaimer ...............................................................................................................................................................................................29