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MLX90614

Datasheet

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MLX90614 family

Datasheet

Single and Dual Zone

Infra Red Thermometer in TO-39

REVISION 13 - 13 SEPTEMBER, 2019

3901090614

Features and Benefits

 Small size, low cost

 Easy to integrate

 Factory calibrated in wide temperature

range:

-40°C…+125˚C for sensor temperature and

-70°C…+380˚C for object temperature.

 High accuracy of 0.5°C in a wide

temperature range (0°C…+50°C for both Ta

and To)

 High (medical) accuracy calibration

 Measurement resolution of 0.02°C

 Single and dual zone versions

 SMBus compatible digital interface

 Customizable PWM output for continuous

reading

 Available in 3V and 5V versions

 Simple adaptation for 8V…16V applications

 Sleep mode for reduced power

consumption

 Different package options for applications

and measurements versatility

 Automotive grade

Application Examples

 High precision non-contact temperature

measurements

 Thermal Comfort sensor for Mobile Air

Conditioning control system

 Temperature sensing element for

residential, commercial and industrial

building air conditioning

 Windshield defogging

 Automotive blind angle detection

 Industrial temperature control of moving

parts

 Temperature control in printers and

copiers

 Home appliances with temperature control

 Healthcare

 Livestock monitoring

 Movement detection

 Multiple zone temperature control – up to

127 sensors can be read via common 2

wires

 Thermal relay / alert

 Body temperature measurement

Ordering Information

Part No.

MLX90614

Temperature

Code

E (-40°C...85°C)

K (-40°C…125°C)

Package

Code

SF (TO-39)

- Option Code

- X X X

(1) (2) (3)

Standard

part

-000

Packing

form

-TU

(1) Supply Voltage/ Accuracy

A - 5V

B - 3V

C - Reserved

D - 3V medical accuracy

(2) Number of thermopiles:

A – single zone

B – dual zone

C – gradient compensated*

(3) Package options:

A – Standard package

B – Reserved

C – 35° FOV

D/E – Reserved

F – 10° FOV

G – Reserved

H – 12° FOV (refractive lens)

I – 5° FOV

K – 13°FOV

Example:

MLX90614ESF-BAA-000-TU * : See page 2

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

REVISION 13 - SEPTEMBER 23, 2019

3901090614

1. Functional diagram

Figure 1: Typical application schematics

2. General Description

The MLX90614 is an Infra Red thermometer for non-

contact temperature measurements. Both the IR

sensitive thermopile detector chip and the signal

conditioning ASSP are integrated in the same TO-39 can.

Thanks to its low noise amplifier, 17-bit ADC and

powerful DSP unit, a high accuracy and resolution of the

thermometer is achieved.

The thermometer comes factory calibrated with a digital

PWM and SMBus (System Management Bus) output.

As a standard, the 10-bit PWM is configured to

continuously transmit the measured temperature in

range of -20…120˚C, with an output resolution of 0.14˚C.

The factory default POR setting is SMBus.

The MLX90614 is built from 2 chips developed and manufactured by Melexis:

 The Infra Red thermopile detector MLX81101

 The signal conditioning ASSP MLX90302, specially designed to process the output of IR sensor.

The device is available in an industry standard TO-39 package.

Thanks to the low noise amplifier, high resolution 17-bit ADC and powerful DSP unit of MLX90302 high accuracy and

resolution of the thermometer is achieved. The calculated object and ambient temperatures are available in RAM of

MLX90302 with resolution of 0.01°C. They are accessible by 2 wire serial SMBus compatible protocol (0.02°C

resolution) or via 10-bit PWM (Pulse Width Modulated) output of the device.

The MLX90614 is factory calibrated in wide temperature ranges: -40°C…125°C for the ambient temperature

and -70°C…380°C for the object temperature.

The measured value is the average temperature of all objects in the Field Of View of the sensor. The MLX90614 offers

a standard accuracy of ±0.5˚C around room temperatures. A special version for medical applications exists offering an

accuracy of ±0.2˚C in a limited temperature range around the human body temperature.

It is very important for the application designer to understand that these accuracies are only guaranteed and

achievable when the sensor is in thermal equilibrium and under isothermal conditions (there are no temperature

differences across the sensor package). The accuracy of the thermometer can be influenced by temperature

differences in the package induced by causes like (among others): Hot electronics behind the sensor, heaters/coolers

behind or beside the sensor or by a hot/cold object very close to the sensor that not only heats the sensing element in

the thermometer but also the thermometer package.

This effect is especially relevant for thermometers with a small FOV like the xxC and xxF as the energy received by the

sensor from the object is reduced. Therefore, Melexis has introduced the xCx version of the MLX90614. In these

MLX90614xCx, the thermal gradients are measured internally and the measured temperature is compensated for

them. In this way, the xCx version of the MLX90614 is much less sensitive to thermal gradients, but the effect is not

totally eliminated. It is therefore important to avoid the causes of thermal gradients as much as possible or to shield

the sensor from them.

As a standard, the MLX90614 is calibrated for an object emissivity of 1. It can be easily customized by the customer for

any other emissivity in the range 0.1…1.0 without the need of recalibration with a black body.

The 10-bit PWM is as a standard configured to transmit continuously the measured object temperature for an object

temperature range of -20°C…120°C with an output resolution of 0.14°C. The PWM can be easily customized for

virtually any range desired by the customer by changing the content of 2 EEPROM cells. This has no effect on the

factory calibration of the device.

CON1

SCL

SDA

GND

Vdd

C1 value and type may differ

in different applications

for optimum EMC

MLX90614

P W M

SDA

M LX906 1 4 connection to SM Bus

Vss

SCL

MLX90614Axx : Vdd=4.5...5.5V

Vdd

0.1uF

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

Page 4 of 57

REVISION 13 - 13 SEPTEMBER 2019

3901090614

3. Contents

Features and Benefits

Features and BenefitsFeatures and Benefits

Features and Benefits

................................

................................................................

................................

Application Examples

Application ExamplesApplication Examples

Application Examples

................................

................................................................

................................

Ordering Information

Ordering InformationOrdering Information

Ordering Information

................................

................................................................

................................

1. Functional

1. Functional 1. Functional

1. Functional diagram

diagramdiagram

diagram

................................

................................................................

................................

2. General Description

2. General Description2. General Description

2. General Description

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3. Contents

3. Contents3. Contents

3. Contents

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4. Glossary of Terms

4. Glossary of Terms4. Glossary of Terms

4. Glossary of Terms

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....

5. Maximum ratings

5. Maximum ratings5. Maximum ratings

5. Maximum ratings

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...

6. Pin definitio

6. Pin definitio6. Pin definitio

6. Pin definitions and descriptions

ns and descriptionsns and descriptions

ns and descriptions

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7. Electrical Specifications

7. Electrical Specifications7. Electrical Specifications

7. Electrical Specifications

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7.1. MLX90614Axx ..................................................................................................................................... 9

7.2. MLX90614Bxx, MLX90614Dxx .......................................................................................................... 11

8. D

8. D8. D

8. Detailed description

etailed descriptionetailed description

etailed description

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1313

8.1. Block diagram .................................................................................................................................... 13

8.2. Signal processing principle ............................................................................................................... 13

8.3. Block description ............................................................................................................................... 14

8.3.1. Amplifier ...................................................................................................................................... 14

8.3.2. Supply regulator and POR .......................................................................................................... 14

8.3.3. EEPROM ...................................................................................................................................... 14

8.3.4. RAM ............................................................................................................................................. 17

8.4. SMBus compatible 2-wire protocol ................................................................................................. 17

8.4.1. Functional description ................................................................................................................ 17

8.4.2. Differences with the standard SMBus specification (reference [1]) ........................................ 18

8.4.3. Detailed description ................................................................................................................... 18

8.4.4. Bit transfer .................................................................................................................................. 19

8.4.5. Commands .................................................................................................................................. 20

8.4.6. SMBus communication examples .............................................................................................. 20

8.4.7. Timing specification .................................................................................................................... 21

8.4.8. Sleep Mode ................................................................................................................................. 22

8.4.9. MLX90614 SMBus specific remarks ........................................................................................... 23

8.5. PWM .................................................................................................................................................. 24

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

Page 5 of 57

REVISION 13 - 13 SEPTEMBER 2019

3901090614

8.5.1. Single PWM format ..................................................................................................................... 25

8.5.2. Extended PWM format ............................................................................................................... 26

8.5.3. Customizing the temperature range for PWM output ............................................................. 27

8.6. Switching Between PWM / Thermal relay and SMBus communication ........................................ 29

8.6.1. PWM is enabled .......................................................................................................................... 29

8.6.2. Request condition ....................................................................................................................... 29

8.6.3. PWM is disabled ......................................................................................................................... 29

8.7. Computation of ambient and object temperatures ....................................................................... 30

8.7.1. Ambient temperature Ta ............................................................................................................ 30

8.7.2. Object temperature To ............................................................................................................... 30

8.7.3. Calculation flow .......................................................................................................................... 31

8.8. Thermal relay .................................................................................................................................... 32

9. Unique Features

9. Unique Features9. Unique Features

9. Unique Features

................................

................................................................

..................................

....

3333

10. Performance Graphs

10. Performance Graphs10. Performance Graphs

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

................................................................

..........................................................

....................................................

..........................

3434

10.1. Temperature accuracy of the MLX90614 ...................................................................................... 34

10.1.1. Standard accuracy .................................................................................................................... 34

10.1.2. Medical accuracy ...................................................................................................................... 36

10.1.3. Temperature reading dependence on VDD ............................................................................ 36

10.2. Field Of View (FOV) ......................................................................................................................... 38

11. Applications Information

11. Applications Information11. Applications Information

11. Applications Information

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................................................................

...................................................

......................................

...................

4242

11.1. Use of the MLX90614 thermometer in SMBus configuration ...................................................... 42

11.2. Use of multiple MLX90614s in SMBus configuration ................................................................... 42

11.3. PWM output operation .................................................................................................................. 42

11.4. Thermal alert / thermostat ............................................................................................................ 43

11.5. High voltage source operation ....................................................................................................... 44

12. Application Comments

12. Application Comments12. Application Comments

12. Application Comments

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................................................................

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4545

13. Stan

13. Stan13. Stan

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

dard information regarding manufacturability of Melexis products with different soldering dard information regarding manufacturability of Melexis products with different soldering

dard information regarding manufacturability of Melexis products with different soldering

processes

processesprocesses

processes

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4747

14. ESD Precautions

14. ESD Precautions14. ESD Precautions

14. ESD Precautions

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4747

15. FAQ

15. FAQ15. FAQ

15. FAQ

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4848

16. Package Information

16. Package Information16. Package Information

16. Package Information

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5050

16.1. MLX90614xxA ................................................................................................................................. 50

16.2. MLX90614xCC ................................................................................................................................. 50

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