MLX90614 family
Datasheet Single and Dual Zone
Infra Red Thermometer in TO-39
Features and Benefits Application Examples
Small size, low cost High precision non-contact temperature
Easy to integrate measurements
Factory calibrated in wide temperature Thermal Comfort sensor for Mobile Air
range: Conditioning control system
-40C+125C for sensor temperature and Temperature sensing element for
-70C+380C for object temperature. residential, commercial and industrial
High accuracy of 0.5C in a wide building air conditioning
temperature range (0C+50C for both Ta Windshield defogging
and To) Automotive blind angle detection
High (medical) accuracy calibration Industrial temperature control of moving
Measurement resolution of 0.02C parts
Single and dual zone versions Temperature control in printers and
SMBus compatible digital interface copiers
Customizable PWM output for continuous Home appliances with temperature control
reading Healthcare
Available in 3V and 5V versions Livestock monitoring
Simple adaptation for 8V16V applications Movement detection
Sleep mode for reduced power Multiple zone temperature control up to
consumption 127 sensors can be read via common 2
Different package options for applications wires
and measurements versatility Thermal relay / alert
Body temperature measurement
Automotive grade
Ordering Information
Part No. Temperature Package - Option Code Standard Packing
Code Code - X X X part form
MLX90614 SF (TO-39) (1) (2) (3) -000 -TU
E (-40C...85C)
K (-40C125C)
(1) Supply Voltage/ Accuracy (2) Number of thermopiles: (3) Package options:
A - 5V A single zone A Standard package
B - 3V B dual zone B Reserved
C - Reserved C gradient compensated* C 35 FOV
D - 3V medical accuracy D/E Reserved
F 10 FOV
G Reserved
H 12 FOV (refractive lens)
I 5 FOV
K 13FOV
Example:
MLX90614ESF-BAA-000-TU * : See page 2
REVISION 13 - 13 SEPTEMBER, 2019
3901090614 MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
1. Functional diagram 2. General Description
The MLX90614 is an Infra Red thermometer for non-
MLX90614Axx: Vdd=4.5...5.5V
contact temperature measurements. Both the IR
J1 1
MLX90614
SCL
U1 sensitive thermopile detector chip and the signal
SCL
Vz
conditioning ASSP are integrated in the same TO-39 can.
PW M 4
Vss
SDA
SDA
2
Thanks to its low noise amplifier, 17-bit ADC and
Vdd
Vdd powerful DSP unit, a high accuracy and resolution of the
C1
3
thermometer is achieved.
GND
0.1uF
The thermometer comes factory calibrated with a digital
CON1
C1 value and type may differ
PWM and SMBus (System Management Bus) output.
in different applications
As a standard, the 10-bit PWM is configured to
for optimum EMC
continuously transmit the measured temperature in
MLX90614 connection to SMBus
range of -20120C, with an output resolution of 0.14C.
Figure 1: Typical application schematics
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 0.01C. They are accessible by 2 wire serial SMBus compatible protocol (0.02C
resolution) or via 10-bit PWM (Pulse Width Modulated) output of the device.
The MLX90614 is factory calibrated in wide temperature ranges: -40C125C for the ambient temperature
and -70C380C 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 0.5C around room temperatures. A special version for medical applications exists offering an
accuracy of 0.2C 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 0.11.0 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 -20C120C with an output resolution of 0.14C. 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.
REVISION 13 - SEPTEMBER 23, 2019
3901090614