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MLX90632 FIR sensor
Datasheet
Features and Benefits
Small size
Easy to integrate
Factory calibrated
External ambient and object temperature
calculation
Measurement resolution of 0.02°C
Supply voltage of 3.3V, supply current 1mA
(sleep current less than 2.5uA)
I
2
C compatible digital interface
Software definable I
2
C address with 1 LSB
bit external address pin
Field of View of 50°
Default refresh rate 0.5s, configurable
between 16ms and 2s
Integrated post-calibration option
Application Examples
Non-contact temperature measurements
Temperature sensing element for
residential, commercial and industrial
building air conditioning
Industrial temperature control of moving
parts
Home appliances with temperature
control
Figure 1: Image of MLX90632
MLX90632 FIR sensor
Datasheet
Description
The MLX90632 is a non-contact infrared temperature sensor in a small SMD SFN package. The device is factory
calibrated with calibration constants stored in the EEPROM memory. The ambient and object temperature can
be calculated based on these calibration constants and the measurement data.
The MLX90632 is factory calibrated in the ambient temperature range from -20 to 85˚C and from -20 to 200˚C for
the object temperature range. The measured value is the average temperature of all objects in the Field Of View
of the sensor.
It is very important for the application designer to understand that these accuracies are guaranteed and
achievable when the sensor is in thermal equilibrium and under isothermal conditions (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.
A major strength of the MLX90632 is that the measured effect of these temperature differences around the
sensor package is reduced to a minimum by the internal measurement algorithm.
In the same way, localized thermal variations -like turbulence in the air- will not generate thermal noise in the
output signal of the thermopile.
However, some extreme cases will influence the sensor.
The typical supply voltage of the MLX90632 is 3.3V. The communication with the chip is done by I
2
C in fast mode
plus (FM+). Through I
2
C the external microcontroller has access to the following blocks:
RAM memory used for measurement data
EEPROM used to store the trimming values, calibration constants and device/measurement settings
Register to control the sensor
Based on this data, the external microcontroller can calculate the object temperature and if needed the sensor
temperature.
An optical filter (long-wave pass) that cuts off the visible and near infrared radiant flux is integrated in the sensor
to provide ambient light immunity. The wavelength pass band of this optical filter is from 2 till 14µm.
MLX90632 FIR sensor
Datasheet
Page 3 of 35
REVISION 3 – FEBRUARY 14, 2018
Contents
Features and Benefits ................................................................................................................................ 1
Application Examples ................................................................................................................................ 1
Description ................................................................................................................................................ 2
Ordering Information ............................................................................................................................ 5 2.
Glossary of Terms .................................................................................................................................. 6 3.
Absolute Maximum ratings .................................................................................................................... 7 4.
Pin definitions and descriptions ............................................................................................................. 8 5.
Electrical characteristics ........................................................................................................................ 9 6.
Product Description ............................................................................................................................. 10 7.
Block diagram .................................................................................................................................... 10 7.1.
Description ........................................................................................................................................ 10 7.2.
Memory map ....................................................................................................................................... 11 8.
Control and configuration registers ..................................................................................................... 13 9.
REG_CONTROL .................................................................................................................................. 13 9.1.
REG_STATUS ..................................................................................................................................... 14 9.2.
I
2
C commands ................................................................................................................................... 15 10.
Addressed read ............................................................................................................................... 16 10.1.
Addressed write .............................................................................................................................. 16 10.2.
Global reset ..................................................................................................................................... 17 10.3.
Addressed reset .............................................................................................................................. 17 10.4.
EEPROM unlock for customer access ............................................................................................ 17 10.5.
Direct read ...................................................................................................................................... 18 10.6.
Operating Modes ............................................................................................................................... 19 11.
Temperature calculation ................................................................................................................... 20 12.
Pre-calculations............................................................................................................................... 21 12.1.
12.1.1. Ambient ..................................................................................................................................... 21
12.1.2. Object ........................................................................................................................................ 21
Ambient temperature .................................................................................................................... 22 12.2.
Object temperature........................................................................................................................ 22 12.3.
Example Temperature Calculation ................................................................................................ 23 12.4.
12.4.1. Ambient temperature calculation ........................................................................................... 24
MLX90632 FIR sensor
Datasheet
Page 4 of 35
REVISION 3 – FEBRUARY 14, 2018
12.4.2. Object temperature calculation ............................................................................................... 25
Performance characteristics .............................................................................................................. 27 13.
Accuracy .......................................................................................................................................... 27 13.1.
Field of View (FoV) .......................................................................................................................... 28 13.2.
Mechanical Drawing .......................................................................................................................... 29 14.
Package dimensions ....................................................................................................................... 29 14.1.
PCB footprint ................................................................................................................................... 30 14.2.
Application schematic........................................................................................................................ 31 15.
Standard information regarding manufacturability of Melexis products with different soldering 16.
processes ............................................................................................................................................ 32
ESD Precautions ................................................................................................................................. 33 17.
FAQ ................................................................................................................................................... 33 18.
Table of figures .................................................................................................................................. 34 19.
Disclaimer .......................................................................................................................................... 34 20.
Contact Information .......................................................................................................................... 35 21.
MLX90632 FIR sensor
Datasheet
Page 5 of 35
REVISION 3 – FEBRUARY 14, 2018
Ordering Information 2.
Product
Temperature
Code
Package
Option
Code
Packing
Form
MLX90632
S
LD
BCB-000
RE/SP
Table 1 : Ordering codes for MLX90632
Legend:
Temperature Code:
S: from -20°C to 85°C sensor temperature
Package Code:
“LD” for SFN 3x3 package
Option Code:
XYZ-123
X: Accuracy
B: standard accuracy
Y: Pixel type
C: high stability version
Z: Field Of View
B: 50 degrees
1: I
2
C level
0: 3V3
2-3:
00: Standard configuration
xx: Reserved
Packing Form:
“RE” for Reel
“SP” for sampling quantities in tubes
Ordering Example:
“MLX90632SLD-BCB-000-RE”
For a non-contact thermometer in SFN 3x3 package with standard accuracy and a
Field Of View of 50 degrees, delivered in Reel.
Table 2: Coding legend
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