MLX90614KSF-ABA datasheet, PDF

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MLX90614KSF-ABA: DescriptionSingle and Dual Zone; File Size643KB，40 Pages; ManufacturerETC2

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MLX90614KSF-ABA Overview

Single and Dual Zone

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MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

Features and Benefits

Small size, low cost

Easy to integrate

Factory calibrated in wide temperature range:

-40 to 125 ˚C for sensor temperature and

-70 to 380 ˚C for object temperature.

High accuracy of 0.5°C over wide temperature

range (0..+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 8 to 16V applications

Power saving mode

Different package options for applications and

measurements versatility

Automotive grade

Applications 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 100

sensors can be read via common 2 wires

Thermal relay/alert

Body temperature measurement

Ordering Information

Part No.

MLX90614

Temperature Code

E (-40°C to 85°C)

K (-40°C to 125°C)

Package Code

SF (TO-39)

- Option Code

-X X X

(1) (2) (3)

(3) Package options:

A – Standard package

B – Reserved

C – 35° FOV

(1) Supply Voltage/

Acccuracy

A - 5V

B - 3V

C - Reserved

D - 3V medical accuracy

Example:

MLX90614ESF-BAA

(2) Number of thermopiles:

A – single zone

B – dual zone

1 Functional diagram

MLX90614Axx: Vdd=4.5...5.5V

MLX90614

SCL

PWM

Vss 4

SDA

2 SDA

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 to 120 ˚C, with an output resolution of 0.14 ˚C and

the POR default is SMBus.

Vdd

GND

0.1uF

CON1

C1 value and type may differ

in different applications

for optimum EMC

Vdd

MLX90614 connection to SMBus

Figure 1 Typical application schematics

3901090614

Rev 003

Page 1 of 40

Data Sheet

03/Oct/2007

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

General description (continued)

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 to 125 ˚C for the ambient temperature

and -70 to 382.2 ˚C for the object temperature. The 10-bit PWM is as a standard configured to transmit

continuously the measured object temperature for an object temperature range of -20 to 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.

The PWM pin can also be configured to act as a thermal relay (input is To), thus allowing for an easy and

cost effective implementation in thermostats or temperature (freezing/boiling) alert applications. The

temperature threshold is user programmable. In an SMBus system this feature can act as a processor

interrupt that can trigger reading all slaves on the bus and to determine the precise condition.

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 thermometer is available in 2 supply voltage options: 5V compatible or 3V (battery) compatible. The 5V

can be easily adopted to operate from a higher supply voltage (8-16V, for example) by use of few external

components (refer to “Applications information” section for details).

An optical filter (long-wave pass) that cuts off the visible and near infra-red radiant flux is integrated in the

package to provide sunlight immunity.

3901090614

Rev 003

Page 2 of 40

Data Sheet

03/Oct/2007

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

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 ...........................................................................................................................................................................................13

8.4 SMBus compatible 2-wire protocol ....................................................................................................................................................13

8.4.1 Functional description ................................................................................................................................................................13

8.4.2 Differences with the standard SMBus specification (reference [1]) ...........................................................................................14

8.4.3 Detailed description....................................................................................................................................................................14

8.4.4 AC specification for SMBus .......................................................................................................................................................15

8.4.5 Bit transfer..................................................................................................................................................................................16

8.4.6 Commands.................................................................................................................................................................................16

8.4.7 Sleep Mode ................................................................................................................................................................................17

8.5 PWM..................................................................................................................................................................................................18

8.5.1 Single PWM format ....................................................................................................................................................................18

8.5.2 Extended PWM format ...............................................................................................................................................................19

8.5.3 Customizing the temperature range for PWM output.................................................................................................................20

8.6 Switching Between PWM and SMBus communication......................................................................................................................21

8.6.1 PWM is enabled .........................................................................................................................................................................21

8.6.2 Request condition ......................................................................................................................................................................21

8.6.3 PWM is disabled ........................................................................................................................................................................21

8.7 Computation of ambient and object temperatures.............................................................................................................................22

8.7.1 Ambient temperature Ta ............................................................................................................................................................22

8.7.2 Object temperature To ...............................................................................................................................................................22

8.7.3 Calculation flow ..........................................................................................................................................................................22

8.8 Thermal relay.....................................................................................................................................................................................24

9 Unique Features........................................................................................................................................................................................25

10 Performance Graphs...............................................................................................................................................................................26

10.1 Temperature accuracy of the MLX90614 ........................................................................................................................................26

10.2 Field Of View (FOV) ........................................................................................................................................................................28

11 Applications Information..........................................................................................................................................................................30

11.1 Use of the MLX90614 thermometer in SMBus configuration ..........................................................................................................30

11.2 Use of multiple MLX90614s in SMBus configuration.......................................................................................................................30

11.3 PWM output operation.....................................................................................................................................................................31

11.4 Thermal alert / thermostat ...............................................................................................................................................................31

11.5 High voltage source operation.........................................................................................................................................................32

12 Application Comments ............................................................................................................................................................................33

13 Standard information regarding manufacturability of Melexis products with different soldering processes............................................35

14 ESD Precautions.....................................................................................................................................................................................35

15 FAQ.........................................................................................................................................................................................................36

16 Package Information ...............................................................................................................................................................................38

16.1 MLX90614XXA ................................................................................................................................................................................38

16.2 MLX90614XXC................................................................................................................................................................................39

17 References..............................................................................................................................................................................................40

18 Disclaimer ...............................................................................................................................................................................................40

3901090614

Rev 003

Page 3 of 40

Data Sheet

03/Oct/2007

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