EVB90614 Melexis Inc, EVB90614 Datasheet - Page 32

• Manufacturer Part Number: EVB90614
• Description: BOARD EVAL FOR MLX90614
• Manufacturer: Melexis Inc

Specifications of EVB90614

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 125°C
• Interface: SMBus (2-Wire/I²C)
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MLX90614
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Sensitivity: -

The VDD dependence of the ambient and object temperature is 0.6 C/V.
Example: As the devices are calibrated at VDD=3V the error at VDD=3V is smallest one. The error in ambient
channel is directly transferred as object channel error (see Figure 23 bellow).
In order to compensate for this error we measure supply voltage and by applying following equation
compensate the result.
3901090614
Rev 006
T
Figure 24: Typical To dependence from supply voltage (practically the same as Ta dependence error
O
_
compensate
d
=
T
O
−
(
VDD
Figure 23: Typical Ta dependence from supply voltage
Figure 25: Typical To compensated dependence error
−
VDD
-0.1
-0.2
-0.3
-0.4
-0.5
-0.10
-0.20
-0.30
-0.40
-0.50
0.5
0.4
0.3
0.2
0.1
-0.10
-0.20
-0.30
-0.40
-0.50
0.50
0.40
0.30
0.20
0.10
0.00
0.50
0.40
0.30
0.20
0.10
0.00
0
2.2
2.2
2.2
0
* )
2.4
2.4
2.4
Typical
2.6
2.6
2.6
Compensated VDD dependence
Typical Ta=f(VDD) dependance
Typical To=f(VDD) dependance
2.8
2.8
2.8
Page 32 of 49
_
dependence
VDD, V
VDD, V
VDD, V
3.0
3.0
3
3.2
3.2
3.2
3.4
3.4
Infra Red Thermometer in TO-39
3.4
=
T
3.6
3.6
3.6
O
−
3.8
3.8
(
3.8
VDD
Sensor1
Sensor2
Sensor3
Sensor4
Sensor5
Sensor6
Sensor7
Sensor8
Sensor9
Sensor10
Sensor11
Sensor12
Sensor13
Sensor14
Sensor15
Sensor16
Sensor1
Sensor2
Sensor3
Sensor4
Sensor5
Sensor6
Sensor7
Sensor8
Sensor9
Sensor10
Sensor11
Sensor12
Sensor13
Sensor14
Sensor15
Sensor16
Sensor1
Sensor2
Sensor3
Sensor4
Sensor5
Sensor6
Sensor7
Sensor8
Sensor9
Sensor10
Sensor11
Sensor12
Sensor13
Sensor14
Sensor15
Sensor16
−
Single and Dual Zone
3
* )
0
6 .
September 30, 2010
Data Sheet