Melexis MLX90614ESF-AAA

Reference Designs (1)

Attributes

Part Number
Octopart Part Number
0cccc5be342cd30b
Manufacturer
Lead Free
Yes
Prefix
U
Description
Imported From Octopart
yes
Package
TO-39
Datasheet
RoHS
Yes

Pins

1
SCL/Vz
2
SDA/PWM
3
VDD
4
VSS

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Datasheet Preview

MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
3901090614 Page 1 of 44 Data Sheet
Rev 005 30 Mar 2009
Features and Benefits
Small size, low cost
Easy to integrate
Factory calibrated in wide temperature range:
-40…+125 ˚C for sensor temperature and
-70…+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…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)
(1) Supply Voltage/
Accuracy
A - 5V
B - 3V
C - Reserved
D - 3V medical accuracy
Example:
MLX90614ESF-BAA
(2) Number of thermopiles:
A – single zone
B – dual zone
C – gradient compensated*
* : See page 2
(3) Package options:
A – Standard package
B – Reserved
C – 35° FOV
F – 10° FOV
1 Functional diagram
J1
CON1
SCL
SDA
GND
Vdd
C1 value and type may differ
in different applications
for optimum EMC
U1
MLX90614
1
PWM
SDA
C1
MLX90614 connection to SMBus
4
Vss
SCL
Vz
MLX90614Axx: Vdd=4.5...5.5V
3
2
Vdd
0.1uF
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 and the
POR default is SMBus.
MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
3901090614 Page 2 of 44 Data Sheet
Rev 005 30 Mar 2009
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…125 ˚C for the ambient temperature
and -70…382.2 ˚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 ±0.5ºC around room temperatures. A special version for medical
applications exists offering an accuracy of ±0.1ºC in a limited temperature range around the human body
temperature.
It is very important for the application design 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 MLX90614-XCX, 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…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 a 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.
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 ambient and sunlight immunity. The wavelength pass band of this optical filter is from 5.5
till 14µm.
MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
3901090614 Page 3 of 44 Data Sheet
Rev 005 30 Mar 2009
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 ...........................................................................................................................................................................................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 AC specification for SMBus .......................................................................................................................................................17
8.4.5 Bit transfer..................................................................................................................................................................................18
8.4.6 Commands.................................................................................................................................................................................18
8.4.7 Sleep Mode ................................................................................................................................................................................19
8.5 PWM..................................................................................................................................................................................................20
8.5.1 Single PWM format ....................................................................................................................................................................21
8.5.2 Extended PWM format ...............................................................................................................................................................22
8.5.3 Customizing the temperature range for PWM output.................................................................................................................23
8.6 Switching Between PWM and SMBus communication......................................................................................................................24
8.6.1 PWM is enabled.........................................................................................................................................................................24
8.6.2 Request condition ......................................................................................................................................................................24
8.6.3 PWM is disabled ........................................................................................................................................................................24
8.7 Computation of ambient and object temperatures.............................................................................................................................25
8.7.1 Ambient temperature Ta ............................................................................................................................................................25
8.7.2 Object temperature To ...............................................................................................................................................................25
8.7.3 Calculation flow..........................................................................................................................................................................25
8.8 Thermal relay.....................................................................................................................................................................................27
9 Unique Features........................................................................................................................................................................................28
10 Performance Graphs...............................................................................................................................................................................29
10.1 Temperature accuracy of the MLX90614 ........................................................................................................................................29
10.2 Field Of View (FOV) ........................................................................................................................................................................31
11 Applications Information..........................................................................................................................................................................33
11.1 Use of the MLX90614 thermometer in SMBus configuration ..........................................................................................................33
11.2 Use of multiple MLX90614s in SMBus configuration.......................................................................................................................33
11.3 PWM output operation.....................................................................................................................................................................34
11.4 Thermal alert / thermostat ...............................................................................................................................................................34
11.5 High voltage source operation.........................................................................................................................................................35
12 Application Comments ............................................................................................................................................................................36
13 Standard information regarding manufacturability of Melexis products with different soldering processes............................................38
14 ESD Precautions.....................................................................................................................................................................................38
15 FAQ.........................................................................................................................................................................................................39
16 Package Information ...............................................................................................................................................................................41
16.1 MLX90614XXA ................................................................................................................................................................................41
16.2 MLX90614XCC................................................................................................................................................................................41
16.3 MLX90614XCF ................................................................................................................................................................................42
16.4 Part marking ....................................................................................................................................................................................42
17 References..............................................................................................................................................................................................43
18 Disclaimer ...............................................................................................................................................................................................43
MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
3901090614 Page 4 of 44 Data Sheet
Rev 005 30 Mar 2009
4 Glossary of Terms
PTAT Proportional To Absolute Temperature sensor (package temperature)
PTC Positive Temperature Coefficient sensor (package temperature)
POR Power On Reset
HFO High Frequency Oscillator (RC type)
DSP Digital Signal Processing
FIR Finite Impulse Response. Digital filter
IIR Infinite Impulse Response. Digital filter
IR Infra-Red
PWM Pulse With Modulation
DC Duty Cycle (of the PWM) ; Direct Current (for settled conditions specifications)
FOV Field Of View
SDA,SCL Serial DAta, Serial CLock – SMBus compatible communication pins
Ta Ambient Temperature measured from the chip – (the package temperature)
To Object Temperature, ‘seen’ from IR sensor
ESD Electro-Static Discharge
EMC Electro-Magnetic Compatibility
ASSP Application Specific Standard Product
TBD To Be Defined
Note: sometimes the MLX90614xxx is referred to as “the module”.
5 Maximum ratings
Parameter MLX90614ESF-Axx
MLX90614ESF-Bxx
MLX90614ESF-Dxx
MLX90614KSF-Axx
Su
pp
l
y
Volta
g
e, V
DD
(
over volta
g
e
)
7V
5V
7V
Su
pp
l
y
Volta
g
e, V
DD
(
o
p
eratin
g)
5.5 V
3.6V
5.5V
Reverse Volta
g
e 0.4 V
O
p
eratin
g
Tem
p
erature Ran
g
e, T
A
-40…+85°C
-40…+125°C
Stora
e Tem
erature Ran
e, T
S
-40…+125°C
-40…+125°C
ESD Sensitivit
y
(
AEC Q100 002
)
2kV
DC current into SCL / Vz
(
Vz mode
)
2 mA
DC sink current, SDA / PWM
p
in 25 mA
DC source current, SDA / PWM
p
in 25 mA
DC clam
p
current, SDA / PWM
p
in 25 mA
DC clamp current, SCL pin 25 mA
Table 1: Absolute maximum ratings for MLX90614
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-
rated conditions for extended periods may affect device reliability.