MLX90614ESF-DCA Melexis Inc, MLX90614ESF-DCA Datasheet - Page 31

IC THERMOMETER IR SGL 3V TO-39

MLX90614ESF-DCA

Manufacturer Part Number
MLX90614ESF-DCA
Description
IC THERMOMETER IR SGL 3V TO-39
Manufacturer
Melexis Inc
Datasheet

Specifications of MLX90614ESF-DCA

Function
Thermometer, Thermostat
Topology
ADC (Sigma Delta), Voltage Regulator
Sensor Type
Internal
Sensing Temperature
-40°C ~ 85°C
Output Type
PWM, SMBus™
Output Alarm
No
Output Fan
No
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
TO-39-3, TO-205AD, Metal Can
For Use With
EVB90614 - BOARD EVAL FOR MLX90614
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
10.1.2 Medical accuracy
A version of the MLX90614 with accuracy suited for medical applications is available. The accuracy in the
range Ta 10ºC - 40ºC and To 32ºC - 42ºC is shown in diagram below. The accuracy for the rest of the
temperature ranges is the same as in previous diagram. Medical accuracy specification is only available for
the MLX90614DAA version.
Versions MLX90614DCI and MLX90614DCH comply with ASTM standard section 5.3.1.2 (Designation: E
1965 – 98 (Re-approved 2009) - Standard Specification for Infrared Thermometers for Intermittent
Determination of Patient Temperature
It is very important for the application design to understand that the accuracy specified in Figure 21 and
Figure 22 are only guaranteed 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 when the measured object is so close to
the sensor that it not only radiates on the sensing element in the thermometer but also heats the thermometer
casing.
This effect is especially relevant for thermometers with a small Field Of View (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-XCC and -XCF, the thermal gradients are measured
internally and the measured temperature is compensated for them. In this way, the MLX90614–XCX is much
less sensitive to thermal gradients induced from outside, but the effect is not totally eliminated. It is therefore
important to avoid introducing strong heat sources close to the sensor or to shield the sensor from them.
10.1.3 Temperature reading dependence on V
In case of medical applications where high accuracy is required and the supply is provided by means of a
battery, a compensation of temperature readings from VDD dependence should be done by the
microcontroller. The dependence is very repeatable and compensation can easily be implemented. As this
dependence comes from the ambient temperature it is the same for all type of devices regardless of FOV and
optics used and it directly translates in the same compensation for object temperature.
3901090614
Rev 006
To,
o
C
Accuracy of the MLX90614DCH and DCI for VDD = 3V (see paragraph 10.1.3)
39
36
32
30
42
45
Figure 22: Accuracy of MLX90614DAA (Ta,To) for medical applications.
10
± 0.3
o
C
Page 31 of 49
20
DD
± 0.2
± 0.1
± 0.2
Infra Red Thermometer in TO-39
o
o
o
C
C
C
30
± 0.3
Ta,
Single and Dual Zone
o
C
o
C
40
September 30, 2010
Data Sheet

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