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MLX90615

Infra Red Thermometer

Features and Benefits

Small size, low cost

Easy to integrate

Factory calibrated in wide temperature range:

-40…85˚C for sensor temperature and

-40…115˚C for object temperature

High accuracy of 0.5° over wide temperature

range (0...+50° for both T

and T

)

High (medical) accuracy calibration

Measurement resolution of 0.02°

SMBus compatible digital interface

Power saving mode

Customizable PWM output for continuous

reading

Embedded emissivity compensation

3V supply voltage

Applications Examples

High precision non-contact temperature

measurements

Hand-held thermometers

Ear thermometers

Home appliances with temperature control

Healthcare

Livestock monitoring

Multiple zone temperature control – up to 127

sensors can be read via common 2 wires

Ordering Information

Part No.

MLX90615

Temperature

Code

S (-20°

C...85°

Package

Code

SG (TO-46)

- Option Code

-X X X

(1) (2) (3)

Standard Packing

part

form

-000

-TU

(3) Package options:

A – 100° FOV

G – 80° FOV

(1) Accuracy

D – medical accuracy

Example:

MLX90615SSG-DAA-000-TU

(2) Specifics:

A – straight pins for thru hole

mounting

1 Functional diagram

2 General description

The MLX90615 is an Infra Red thermometer for non

contact temperature measurements. Both the IR sensitive

thermopile detector chip and the signal conditioning chip are

integrated in the same TO-46 can package.

Thanks to its low noise amplifier, 16-bit ADC and

powerful DSP unit, a high accuracy and resolution of the

thermometer is achieved.

The thermometer is factory calibrated with the digital

SMBus compatible interface enabled. Readout resolution is

0.02°

SCL

SDA

Vdd

GND

MLX90615

SDA

Vss

SCL

Vdd

0.1uF

CON1

C1 value and type may differ

in different applications

for optimum EMC

Figure 1 Typical application schematics –

MLX90615 connection to SMBus

3901090615

Rev 005

Page 1 of 32

Data Sheet

08 November 2013

MLX90615

Infra Red Thermometer

General description (continued)

The MLX90615 is built from 2 chips, the Infra Red thermopile detector and the signal conditioning

chip MLX90325, specially designed by Melexis to process the output of IR sensor.

The device is available in an industry standard TO-46 package.

Thanks to the low noise amplifier, high resolution 16-bit ADC and powerful DSP unit of the

MLX90325, Melexis is able to deliver a high accuracy and high resolution infrared thermometer. The

calculated object and ambient temperatures are available in the RAM memory of the MLX90325 with a

resolution of 0.02˚C. The values are accessible by 2 wire serial SMBus compatible protocol with a resolution

of 0.02° or via a 10-bit PWM (Pulse Width Modulated) signal from the device.

The MLX90615 is factory calibrated in standard temperature ranges from: -40...85˚C for the ambient

temperature and from -40...115˚C for the object temperature.

As a standard, the MLX90615 is delivered with a programmed 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 MLX90615 can be battery powered.

An optical filter (5.5µm …14µm long-wave pass) that cuts off the visible and near infra-red radiant

flux is integrated in the package to make the sensor insensitive to visible light.

3901090615

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Page 2 of 32

Data Sheet

08 November 2013

MLX90615

Infra Red Thermometer

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

........................................................................................................................................................ 19

8.7.2 Object temperature T

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

3901090615

Rev 005

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Data Sheet

08 November 2013

MLX90615

Infra Red Thermometer

4 Glossary of Terms

PTAT

POR

HFO

DSP

FIR

IIR

LPF

FOV

SDA, SCL

ESD

EMC

TBD

Proportional To Absolute Temperature

sensor (package temperature)

Power On Reset

High Frequency Oscillator

(RC)

Digital Signal Processing

Finite Impulse Response.

Digital filter

Infinite Impulse Response.

Digital filter

Infra-Red

Direct Current

(for settled conditions specifications)

Low Pass Filter

Field Of View

Serial DAta, Serial CLock

– SMBus compatible communication pins

Ambient Temperature

measured from the chip – (the package temperature)

Object Temperature,

‘seen’ from IR sensor

Electro-Static Discharge

Electro-Magnetic Compatibility

To Be Defined

Table 1: Glossary of Terms

5 Maximum ratings

Parameter

MLX90615

Supply Voltage, V

(over voltage)

Supply Voltage, V

(operating)

3.6V

Reverse Voltage

0.5 V

Operating Temperature Range, T

-20…+85°C

Storage Temperature Range, T

-20…+125°

ESD Sensitivity (AEC Q100 002)

2kV

DC sink current, SDA pin

25 mA

DC clamp current, SDA pin

10 mA

DC clamp current, SCL pin

10 mA

Table 2: Absolute maximum ratings for MLX90615

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute

maximum rated conditions for extended periods may affect device reliability.

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Data Sheet

08 November 2013

MLX90615

Infra Red Thermometer

6 Pin definitions and descriptions

4 VSS

3 SCL

1 SDA / PWM

2 VDD

Bottom view

Figure 2: Pin description MLX90615

Pin Name

SDA / PWM

VDD

SCL

VSS

Function

Digital input / output open drain NMOS. In SMBus mode (factory default) Serial Data

I/O. In PWM mode – PWM output. Weak pull-up (300kΩ typ) is present on this pin.

External supply voltage.

Serial clock input for 2 wire communications protocol. Weak pull-up (300kΩ typ) is

present on this pin.

Ground. The metal can is also connected to this pin.

Table 3: Pin description MLX90615

Notes:

For EMC and isothermal conditions reasons, it is highly recommended not to use any electrical connection to

the metal can except by the Vss pin.

Both SCL and SDA pin have input Schmidt trigger when the thermometer is operated in the 2-wire

SMBus interface mode.

3901090615

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Data Sheet

08 November 2013