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MLX90288KDC-CAA-000-SP

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
MLX90288
SMD Programmable Linear Hall Sensor IC
Featuring Analog Ratiometric Output
3901090288 Page 13 of 19
Rev 002 May/12
7 Thermal Sensitivity Drift Compensation
7.1 Introduction
The embedded temperature sensor is digitized via the main path ADC before each analog amplified Hall
sensor voltage ADC in case TEMPSENSOR is enabled. This temperature information is used to generate
either an address for a ROM Look-up Table in order to obtain a quadratic temperature compensation
(SECONDORDERTC=1), or a value proportional to the temperature that allows a linear IC gain
compensation (SECONDORDERTC=0). Both compensations rely on the TEMPOFF and TEMPTC
parameters.
7.2 Linear Compensation (1
st
Order)
The conventional linear temperature compensation proves to be adequate for small application temperature
ranges and/or small magnet temperature coefficients. In such cases the error induced by the linear approach
are limited and prove to be good enough for the desired system sensitivity drift.
7.3 Quadratic Compensation (2
nd
Order)
This look up table is stored in ROM and contains the inverse transfer function of a specific magnetic flux
density over temperature. It should be used for magnets with temperature coefficients lower than -1500
ppm/degC, as is typically the case for plastic bonded magnets. Such magnet temperature coefficients can not
optimally be compensated by the linear method (see Application Note “Temperature Compensation for Linear
Programmable Hall effect sensors” on the Melexis webpage). By multiplying the output of the ROM table with
the amplified magnetic flux density signal in the digital domain, the magnet temperature drift is compensated
for, resulting in a (nearly) temperature independent sensitivity of the whole system (magnet + IC).
Figure 3: ROM table - 2
nd
order gain compensation
Gain compensation
0.85
0.9
0.95
1
1.05
1.1
1.15
1.2
1.25
1.3
-50.00 -30.00 -10.00 10.00 30.00 50.00 70.00 90.00 110.00 130.00 150.00
Temperature [Degree]
MLX90288
SMD Programmable Linear Hall Sensor IC
Featuring Analog Ratiometric Output
3901090288 Page 14 of 19
Rev 002 May/12
The factory calibration performed by Melexis targets a specific magnet TC, which serves as accurate basis
for any delta calibration that should be performed when using a magnet with a different TC. This is performed
via the solver software provided by Melexis. The TEMPOFF parameter defines for which temperature the
gain compensation should be 1 (i.e. no compensation), whereas the TEMPTC parameter defines which
temperature range of the curve presented in Figure 3 is mapped onto the application temperature range.
Higher TEMPTC codes will use a bigger range, which corresponds to more gain compensation and thus
bigger magnet temperature coefficients.
7.4 Additional Information
Please refer to the application note “Thermal Sensitivity Drift Compensation on MLX90288” on
http://www.melexis.com (coming soon).
MLX90288
SMD Programmable Linear Hall Sensor IC
Featuring Analog Ratiometric Output
3901090288 Page 15 of 19
Rev 002 May/12
8 Standard information regarding manufacturability of Melexis products
with different soldering processes
Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity
level according to following test methods:
Reflow Soldering SMD’s (Surface Mount Devices)
• IPC/JEDEC J-STD-020
Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices
(classification reflow profiles according to table 5-2)
• EIA/JEDEC JESD22-A113
Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing
(reflow profiles according to table 2)
Wave Soldering SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)
• EN60749-20
Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat
• EIA/JEDEC JESD22-B106 and EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Iron Soldering THD’s (Through Hole Devices)
• EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Solderability SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)
• EIA/JEDEC JESD22-B102 and EN60749-21
Solderability
For all soldering technologies deviating from above mentioned standard conditions (regarding peak
temperature, temperature gradient, temperature profile etc) additional classification and qualification tests
have to be agreed upon with Melexis.
The application of Wave Soldering for SMD’s is allowed only after consulting Melexis regarding assurance of
adhesive strength between device and board.
Melexis is contributing to global environmental conservation by promoting lead free solutions. For more
information on qualifications of RoHS compliant products (RoHS = European directive on the Restriction Of
the use of certain Hazardous Substances) please visit the quality page on our website:
http://www.melexis.com/quality.aspx
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MLX90288KDC-CAA-000-SP

Mfr. #:
Buy MLX90288KDC-CAA-000-SP
Manufacturer:
Melexis
Description:
Board Mount Hall Effect / Magnetic Sensors SMD Programmable Linear Hall Sensor IC - Analog Output
Lifecycle:
New from this manufacturer.
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