MLX90601C Datasheet, PDF (9/12 Pages) List of Unclassifed Manufacturers – SPI IR thermometer module

Datasheet MLX90601C
SPI IR thermometer module
ESD Precautions
Electronic semiconductor products are sensitive
to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control
procedures whenever handling semiconductor
products.
FAQ
Q: What is the accuracy?
A: For an object temperature range between
5°C and 60°C the accuracy of measurement
is ±1°C. For the wider object temperature
range version (-20°C/120°C) the accuracy of
measurement is ±2°C.
Q: What is FOV?
A: The FOV or Field Of View is a definition of
the area the sensor is ‘seeing’. The sensor
will detect radiation coming in at an angle,
relative to the sensor’s central axis, from 0° to
35°C. The full viewing angle is thus 70°.
Q: What is the useful temperature range?
A: There are two temperature ranges of interest;
the temperature of the object (or target),
which you are trying to measure and the
temperature of the sensor. The sensor
temperature, called Tambient, should be
between 0°C and 50°C. Outside this range
the ambient temperature compensation will
no longer work and calculation of the object’s
temperature will no longer be correct. The
TEMPOUT output will saturate under this
condition. The object temperature, called
Tobject, should be between 5°C and 60°C.
Outside this range the IROUT output will
saturate.
Q: Can the temperature ranges be changed?
A: Yes, MLX90313 is a programmable device.
Melexis selected a limited set of standard
ranges that will fit the majority of applications
in order to limit delivery times. However, if
necessary, the ranges can be adapted for
any particular application.
Glossary of Terms
ADC: Analog to Digital Converter
Ambient Compensation: The IR signal captured
by a thermopile sensor is not only dependent
on the temperature of the object (Tobject) but
also on the temperature of the sensor itself.
Therefore the IR signal is compensated for
this effect by means of the measured sensor
temperature (Tambient). This rather complex
calculation is performed in the linearisation
unit of MLX90313.
Chopper Amplifier: Special amplifier
configuration aimed at ultra low offset.
DAC: Digital to Analog Converter.
EEprom: Non-volatile memory that can be
electrically erased and rewritten. This type of
memory is used to store configuration and
calibration data for the module.
ECC: Error Checking and Correction. The
EEprom on board of MLX90313 is equipped
with a checking and correction feature based
on the Hamming Code method.
IR: Infrared. Every object emits infrared
radiation in relation to its temperature. This
effect can be used to measure this
temperature without the need for physical
contact.
Linearisation: The signal from a thermopile is not
linear with the object temperature.
MLX90313 is therefore equipped with a
digital calculation unit that produces an
output that is linear with the object
temperature.
POR: Power-on reset: Reset circuit that starts
the digital system in a known state whenever
the supply voltage is cycled
PSSR: Power Supply Rejection Ratio: Measure
for an amplifier’s immunity to disturbances on
the supply connection.
PTC: See Thermistor
PWM: Pulse Width Modulation: Binary periodical
signal which uses variation of the duty cycle
to code information.
SPI: Serial Peripheral Interface. Commonly
used, 4 wire, serial link to connect different
circuits over a short distance
Ta, Tambient: The temperature of the IR sensor.
Target: or Object: The object the IR module is
aimed at.
Thermistor: Temperature dependant resistor.
Basically there are 2 types. The types that
increase their resistance with rising
temperature are PTC (positive thermal
coefficient) type. The ones that decrease
their resistance with rising temperature we
call NTC (negative thermal coefficient) type.
The MLX90313 can work with both types.
The MLX90601 modules are equipped with
sensors that use PTCs.
To, Tobject: The temperature of the object one
wished to measure with the module
390109060103
Rev. 004
Page 9 of 12
Dec/01