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Datasheet: MLX90251 (Melexis, Inc.)

Programmable Linear Hall Effect Sensor

 

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MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 1 of 15
Data Sheet
Rev. 001
Nov/02
Features and Benefits
Analog Signal Processing
Quad Switched Hall Plate / Chopper Stabilized Amplifier
Ratiometric Output for A/D Interface
Adjustable Output Quiescent Voltage (Voq)
Adjustable Sensitivity
Adjustable Low-Pass Filter
Adjustable Output Driver Configuration
Adjustable Clamping Voltage
Adjustable Thermal Voq Drift
Adjustable Sensitivity Temperature Coefficient (1
st
& 2
nd
Order)
Adjustable Internal Bias Point
Applications
Linear Position Sensing
Rotary Position Sensing
Current Sensing

Ordering Information
Part No.
Temperature Suffix
Package Code
Option code

MLX90251
L (-40C to 150C)
VA (4 leads)
-
MLX90251
K (-40C to 85C)
VA (4 leads)
-
1. Functional Diagram



D
A
C
DAC
OPA
OPA
D
A
C
D
A
C
Shift Register
E E P R O M
2
3
1
Supply
D
A
C
D
A
C
4


Pin 1 Vdd (Supply)
Pin 2 Test
Pin 3 Vss (Ground)
Pin 4 Output
2. Description
The MLX90251 is a Programmable Linear Hall
Effect sensor IC fabricated utilizing Silicon-
CMOS technology. It possesses active error
correction circuitry, which virtually eliminates the
offset errors normally associated with analog
Hall effect devices. All the parameters of the
MLX90251 transfer characteristic are fully
programmable for even greater versatility.
The Voq (Vout @ B = 0 Gauss), sensitivity,
direction of slope, the magnitude of sensitivity
drift over temperature (TC 1
st
& 2
nd
order), the
clamping level, the thermal Voq drift and the
bandwidth, are all programmable.
The ratiometric output voltage is proportional to
the supply voltage. When using the supply
voltage as a reference for an A/D converter,
fluctuations of
10% in supply voltage will not
affect accuracy. When programmed for a
conventional sensitivity (with a positive gain), the
voltage at the output will increase as a South
magnetic field is applied to the branded face of
the MLX90251. Conversely, the voltage output
will decrease in the presence of a North
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 2 of 15
Data Sheet
Rev. 001
Nov/02
magnetic field. The MLX90251 has a very stable
thermal compensation for both the sensitivity
and the Voq over a broad temperature range.
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 3 of 15
Data Sheet
Rev. 001
Nov/02
TABLE OF CONTENTS
FEATURES AND BENEFITS .................................................................................................................. 1
APPLICATIONS ...................................................................................................................................... 1
ORDERING INFORMATION.................................................................................................................... 1
1.
FUNCTIONAL DIAGRAM................................................................................................................. 1
2.
DESCRIPTION ................................................................................................................................. 1
3.
GLOSSARY OF TERMS .................................................................................................................. 4
4.
ABSOLUTE MAXIMUM RATINGS ................................................................................................... 4
5.
MLX90251 ELECTRICAL SPECIFICATIONS ................................................................................... 5
6.
MLX90251 PROGRAMMABLE FEATURES..................................................................................... 6
6.1.
I
NTERNAL
B
IAS
P
OINT
...........................................................................................................................6
6.2.
M
AIN
O
SCILLATOR
F
REQUENCY
............................................................................................................6
6.3.
C
HOPPING
F
REQUENCY
.........................................................................................................................6
6.4.
DIDO
S
PEED
........................................................................................................................................7
6.5.
M
ULTIPLEXED
DAC
R
EFRESH
F
REQUENCY
............................................................................................7
6.6.
C
LAMPING
L
EVELS
................................................................................................................................7
6.7.
T
HERMAL
V
OQ
D
RIFT
...........................................................................................................................7
6.8.
D
IAGNOSTIC
O
UTPUT
L
EVEL
.................................................................................................................7
6.9.
F
ILTER
..................................................................................................................................................7
6.10.
S
LOPE
...................................................................................................................................................8
6.11.
O
UTPUT
A
MPLIFIER
C
ONFIGURATION
....................................................................................................8
6.12.
O
UTPUT
Q
UIESCENT
V
OLTAGE
(V
OQ
)....................................................................................................8
6.13.
R
OUGH
G
AIN
........................................................................................................................................9
6.14.
F
INE
G
AIN
............................................................................................................................................9
6.15.
S
ENSITIVITY
T
EMPERATURE
C
OEFFICIENT
............................................................................................10
6.16.
ID
N
UMBER
........................................................................................................................................10
6.17.
CRC...................................................................................................................................................11
6.18.
M
EMORY
M
ELEXIS
L
OCK
....................................................................................................................11
6.19.
M
EMORY
C
USTOMER
L
OCK
.................................................................................................................11
7.
MLX90251 PROGRAMMING TOOL ............................................................................................... 11
8.
APPLICATION INFORMATION ...................................................................................................... 12
9.
RELIABILITY INFORMATION ........................................................................................................ 13
10.
ESD PRECAUTIONS...................................................................................................................... 13
11.
PACKAGE INFORMATION ............................................................................................................ 14
12.
DISCLAIMER ................................................................................................................................. 15
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 4 of 15
Data Sheet
Rev. 001
Nov/02
3. Glossary of Terms

1 mT = 10 Gauss: Magnetic flux density units.
Voq = Output Quiescent Voltage i.e. Vout for B = 0 Gauss
TC = Sensitivity Temperature Coefficient (in ppm/Deg.C.)
4. Absolute Maximum Ratings
Supply Voltage, V
DD
(overvoltage)
24 V
Supply Voltage, V
DD
(operating)
6.5 V
Reverse Voltage Protection (100 ms max)
- 24 V
Output Voltage
24 V
Reverse Output Voltage
-0.7 V
Output Current, I
OUT
25 mA
Operating Temperature Range, T
A
-40
C to 150
C
Storage Temperature Range, T
S
-55C to 165C
Magnetic Flux Density
Infinite

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-
maximum-rated conditions for extended periods may affect device reliability.
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 5 of 15
Data Sheet
Rev. 001
Nov/02
5. MLX90251 Electrical Specifications
DC Operating Parameters T
A
as specified by the Temperature suffix (L : -40
o
C to 150
o
C K : -40
o
C to
85
o
C), V
DD
= 5 V (unless otherwise specified)
Parameter
Symbol Test Conditions
Min
Typ
Max
Units
Nominal Supply Voltage
Vddnom
-
5
-
V
Supply Voltage
Vdd
(operating - full accuracy)
4.5
-
5.5
V
Supply Voltage
Vddred (operating - reduced accuracy) 4
-
6.0
V
Max Supply Voltage
Vddmax (overvoltage protection)
24
-
-
V
Reverse Supply Voltage
Vddrev (permanent)
- 14.5
-
-
V
Nominal Supply Current
Iddnom Vdd = Vddnom
4.0
6.0
8.0
mA
Supply Current
Idd
Vdd = 4.5 ... 5.5 V
3.0
-
9.0
mA
Supply Current
Iddred
Vdd = 4.0 ... 6.0 V
2.0
-
10.0
mA
Reverse Supply Current
Iddrev
Vdd = Vddrev
-65
-40
V
Short Circuit Supply Current Iddshort1 Vdd = Vddnom
Out shorted to Gnd / Vddnom
Permanent
20
30
mA
Short Circuit Supply Current Iddshort2 Vdd < 6 V
Out shorted to Vdd
Permanent
25
35
mA
Output Voltage Swing
Voutpd Pull Down Load no clamping
(to Ground)
1
98
%Vdd
Output Voltage Swing
Voutpd Pull Up Load no clamping
(to Vddnom)
2
99
%Vdd
Output Short-Circuit Current Ioutsc
Vdd = Vddnom
Output shorted to Gnd /
Vddnom
Permanent
15
25
mA
Power-on Delay
Tpo
5
ms

MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 6 of 15
Data Sheet
Rev. 001
Nov/02
6. MLX90251 Programmable Features
6.1. Internal Bias Point

The Internal Bias Point (AGND) can be adjusted by changing the corresponding 10 bits code. The
parameter has similar effect to the Voq (or Offset) adjust. It allows actually a shift of the whole Voq adjust
window in the range -100 %Vdd...200%Vdd.

In other words, the MLX90251 can provide the right transfer characteristic even with a strictly unipolar
magnetic span (virtual Voq).

This parameter is adjusted by Melexis depending on the customer application requirements.
6.2. Main Oscillator Frequency

The oscillator frequency of the MLX90251 (with minimal gain setting) can be adjusted in the range
0.7MHz...1.3MHz thanks to a 4 bits code. This oscillator frequency FCKADJ will be adjusted by Melexis at
1.1MHz if the customer application does not require any other value.

The oscillator frequency is automatically linked to the requested sensitivity of the device especially the
Rough Gain parameter (RG see section 6.13).
6.3. Chopping Frequency

The refresh frequency of the chopper stabilized stage (dynamic offset cancellation) is adjusted through
the parameter CKANA (2 bits). This frequency is actually a division of the main frequency (see section
6.2): the ratio 1, 2, 4 and 8 are available.
Rough Gain
(RG)
Chopping
frequency for
CKANA = 0
Chopping
frequency for
CKANA = 1
Chopping
frequency for
CKANA = 2
Chopping
frequency for
CKANA = 3
0...3
1100 kHz
550 kHz
275 kHz
137 kHz
4...7
550 kHz
275 kHz
137 kHz
69 kHz
8...11
275 kHz
137 kHz
69 kHz
34 kHz
12...15
137 kHz
69 kHz
34 kHz
17 kHz

The refresh frequency of the output of the MLX90251 is directly linked to the chopping frequency
Rough
Gain
(RG)
Refresh
frequency for
CKANA = 0
Refresh
frequency for
CKANA = 1
Refresh
frequency for
CKANA = 2
Refresh
frequency for
CKANA = 3
0...3
275 kHz
137 kHz
69 kHz
34 kHz
4...7
137 kHz
69 kHz
34 kHz
17 kHz
8...11
69 kHz
34 kHz
17 kHz
8.6 kHz
12...15
34 kHz
17 kHz
8.6 kHz
4.3 kHz


The chopping frequency is adjusted by Melexis based on the customer application requirements. There is
a trade-off between impulse response time (or bandwidth) and accuracy.
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 7 of 15
Data Sheet
Rev. 001
Nov/02
6.4. DIDO Speed

The DIDO is the first amplifier of the analog signal processing chain. It is a part of the chopper amplifier.
The parameter SLOW (1 bit) can be used to select its speed and therefore its accuracy. It contributes to
the accuracy (thermal drift, noise) of the whole IC.
6.5. Multiplexed DAC Refresh Frequency

The DAC controlling the internal bias, the Voq and the clamping levels is actually multiplexed. The refresh
rate of the DAC can be fixed by using the 2 bits code of CKDAC. The refresh rate is automatically linked
to the main oscillator frequency.

It will be adjusted at Melexis in order to meet the optimal thermal drift requirement.
CKDAC
Main Oscillator
Frequency
DAC Refresh
Frequency
Hold Time
0
1100 kHz
137 kHz
1.8
s
1
550 kHz
69 kHz
3.6
s
2
275 kHz
34 kHz
7.3
s
3
137 kHz
17 kHz
14.5
s
6.6. Clamping Levels

The output swing of the MLX90251 can be clamped between 2 independent levels called the clamping
levels. The minimum (resp. maximum) value is referred as Clamp Lo (resp. Clamp Hi).

The parameters controlling those levels are CLAMPLOW and CLAMPHIGH and they are both 10 bits
code. The programming range is 0 to 100%Vdd for both levels with a resolution of ca. 5 mV.
6.7. Thermal Voq Drift

The thermal Voq drift parameter is a 4 bits code allowing an improvement of the accuracy of the transfer
characteristic over temperature. This parameter is fixed by Melexis during the tri-temp test of the part.
6.8. Diagnostic Output Level

The MLX90251 memory content is secured through a CRC. This self-diagnostic feature brings the output
in a defined range. To get rid of the output load influence, this fault-level (FAULTLEV) can be fixed to
either Gnd (to be used with pull-down load) or Vdd (to be used with pull-up load).

This parameter is programmed in the application itself.
6.9. Filter

The MLX90251 includes 2 programmable filters placed in the chopper stages and in the fine gain stages.
Those 2 filters are controlled through a 4 bits code.

The code 0 corresponds to minimum filtering i.e. maximum speed (impulse response time) but maximum
noise.
The code 15 provides the maximum filtering i.e. minimum speed and minimum noise on the output.

The code is fixed in the application.
It is important to notice that the noise is also linked to the gain settings and therefore, the filter option
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 8 of 15
Data Sheet
Rev. 001
Nov/02
needs to be used accordingly to meet the best performances.

The table below shows the output noise (in mVrms) Vs. the filter setting for given RG and FG settings.
Rough
Gain
Fine
Gain
Filter
0
Filter
2
Filter
4
Filter
6
Filter
8
Filter
10
Filter
12
Filter
14
0
0
0.83
0.58
0.41
0.39
0.79
0.60
0.35
0.28
0
1023
2.29
1.47
0.76
0.74
1.89
1.52
0.46
0.43
3
0
1.60
1.10
0.88
0.78
1.56
1.08
0.49
0.48
3
1023
4.03
3.00
2.03
1.79
4.02
2.86
1.02
1.01
4
0
0.99
0.78
0.49
0.50
1.02
0.65
0.33
0.35
4
1023
2.39
1.92
1.19
1.00
2.56
1.63
0.60
0.60
7
0
2.91
1.93
1.39
1.27
2.91
1.93
0.76
0.79
7
1023
7.55
4.99
3.90
3.17
7.44
4.99
1.82
1.75
8
0
1.31
0.91
0.72
0.59
1.40
0.90
0.40
0.39
8
1023
3.56
2.54
1.62
1.41
3.66
2.41
0.78
0.84
11
0
4.55
2.96
2.20
1.78
4.55
2.95
1.18
1.10
11
1023
11.75
7.66
5.57
4.82
11.74
7.68
2.78
2.65
12
0
2.12
1.41
1.00
0.90
2.25
1.36
0.61
0.53
12
1023
5.58
3.75
2.28
2.14
5.60
3.14
1.24
1.15
15
0
7.89
5.01
3.88
3.15
7.92
5.00
1.79
1.71
15
1023
20.37
13.01
9.90
8.08
20.47
12.91
4.48
4.36
6.10. Slope

The slope of the MLX90251 transfer characteristic can be fixed (parameter INVERTSLOPE) to
accommodate application requirements and/or the magnet polarity. The slope is inverted in the first stage
of the IC i.e. where the Hall signal is generated.
6.11. Output Amplifier Configuration

The output buffer configuration can be selected to tune the response time of the amplifier itself, to
accommodate any capacitive load and also to improve the saturation voltage (output swing).
MODE
Maximum
Output
Current
(Isc)
Capacitive
Load
Response
Time for
20%/80%
Vsat with 5k
load
to opposite supply
0
25 mA
Cl < 100nF
4
s
0.75%Vdd
1
6mA
Cl < 47nF
15
s
1.5%Vdd
2
25 mA
Cl > 150nF
= Isc / Cl
0.75%Vdd
3
6mA
Cl > 33nF
= Isc / Cl
1.5%Vdd

6.12. Output Quiescent Voltage (Voq)

The Voq can be adjusted with a 10 bits resolution in the window allowed by the AGND setting (see section
6.1).
The Voq is adjusted in the customer application through the parameter OFFSET. It actually fixes the offset
of the output transfer characteristic.
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 9 of 15
Data Sheet
Rev. 001
Nov/02
6.13. Rough Gain

The sensitivity of the MLX90251 is controlled through several parameters linked to dedicated internal
amplification stages.

One of those is the rough gain setting (parameter RG) that provides a 4 bits adjust.

As described above, the refresh frequency is adapted automatically to the RG setting to match the
chopper gain-bandwidth product.

The RG affects both stages (DIDO / DTS) of the chopper amplifier. The table below shows the chopper
amplifier gain Vs. the parameter RG.
RG
DIDO Gain
DTS Gain
Total
00 (00 00)
16
1.0
16
01 (00 01)
16
1.5
24
02 (00 10)
16
2.33
37
03 (00 11)
16
4.0
64
04 (01 00)
39
1.0
39
05 (01 01)
39
1.5
59
06 (01 10)
39
2.33
91
07 (01 11)
39
4.0
156
08 (10 00)
82
1.0
82
09 (10 01)
82
1.5
123
10 (10 10)
82
2.33
191
11 (10 11)
82
4.0
328
12 (11 00)
205
1.0
205
13 (11 01)
205
1.5
308
14 (11 10)
205
2.33
477
15 (11 11)
205
4.0
820

6.14. Fine Gain

The sensitivity of the MLX90251 is controlled through several parameters linked to dedicated internal
amplification stages.

One of those is the fine tuning gain stage (parameter FG) that provides a 10 bits adjust. The gain range of
FG is within 1.0...2.5.

The RG and FG parameters are adjusted in the application to fix the sensitivity (gain) of the output
transfer characteristic.

Note also that the bit INVERTSLOPE (see section 6.10) can be used to fix the "sign" of the sensitivity.

The following chart shows the sensitivity that can be reached by adjusting both RG and FG.







MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 10 of 15
Data Sheet
Rev. 001
Nov/02
Sensitivity Programming Range
0
5
10
15
20
25
0
1
2
3
4
5
6
7
8
9
10
11
Rough Gain
S
e
n
s
i
t
i
v
i
t
y

(

m
V
/
G
)
6.15. Sensitivity Temperature Coefficient

Since the flux density for the magnet used in the application (e.g. SmCo, NdFeB, ferrite,...) will have
typically a negative temperature coefficient (the strength decreases if the temperature increases), the IC
sensitivity needs to compensate this effect.

Therefore, the sensitivity temperature coefficient is programmed by Melexis (thanks to a tri-temp test on
100% of the parts) to compensate the temperature behaviour of the whole system used around the Hall
sensor (i.e. magnet, airgap variations, mechanical variations,...).

To allow an optimal compensation, the sensitivity temperature coefficient is adjusted through a set of 3
parameters: TCW (selection of a window/range of TC 3 bits), TC (1
st
order compensation 5 bits) and
TC2ND (2
nd
order compensation 6 bits).

The programming accuracy for the TC of the sensitivity is 100 ppm/Deg.C.

However, for the budget error of the whole system, the compensation mismatch (system Vs. IC) tolerance
has to be taken into account.
6.16. ID Number

For traceability purpose, Melexis will program a unique ID number for each IC. Actually, per lot number
(present on the IC marking), the wafer number, the X and Y coordinates will be stored in the memory.
There are still some locations left in the Melexis area.

However, 64 bits are also available for the customer to add a serial number of the product,...

MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 11 of 15
Data Sheet
Rev. 001
Nov/02
6.17. CRC

The EEPROM content is secured thanks to a CRC validation system (3 bits).

Note:

In addition to the global CRC, each bit of the EEPROM is meant to be full redundant i.e. each bit is written
in 3 separate cells and a "majority voting" is applied. The 64 ID bits available for the customer are not
redundant.
6.18. Memory Melexis Lock
The part of the memory programmed by Melexis is locked through the bit MLXLOCK in order to prevent
any data changes in this area.

The MLXLOCK protects the following Melexis settings: AGND, FCKADJ, SLOW, CKANA, CKDAC,
DRIFT, TCW, TC, TC2ND

However, the following settings are still accessible: OFFSET, RG, FG, INVERTSLOPE, CLAMPLOW,
CLAMPHIGH, FILTER, MODE, CRC, FAULTLEVEL
6.19. Memory Customer Lock
The whole memory is locked through the bit MEMLOCK in order to prevent any data changes after the
final calibration in the application.

Note:

The MLX90251 can be unlocked if the Pin 2 (Test) is accessible and set in the right configuration. In
normal operating condition, Pin 2 is tied to the ground internally. However, for EMI immunity, the Pin 2 will
be tied to the ground externally too (i.e. Pins 2 and 3 shorted).

7. MLX90251 Programming Tool

The MLX90251 can be programmed by using the PTC-03 programmer and the dedicated evaluation
software to load and program the parts in the application. The programming of the parts is done only
through the functional pins of the IC i.e. Vdd (Supply), Vss (Gnd) and Out (Output).

The "cockpit" of the programming software is shown on Page 12.

Note:

The MLX90251 programming is done through the output pin with the supply voltage raised up to 9 V. It
should be notice that any connected components must also withstand this voltage excursion.






MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 12 of 15
Data Sheet
Rev. 001
Nov/02
8. Application Information
MLX
902.51
VDD
1 2 3 4
C1 C2
Pin Description
Recommended Wiring.
Pin1: Vdd
Pin2: Test*
Pin3: Vss
Pin4: Out
C1=2.5nF
C2=2.5nF
Multilayers surface mount capacitors
recommended.
*Readback diagnostic use only. Pin2
is not for programming device. For
best results tie to Vss.
Recommended Wiring
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 13 of 15
Data Sheet
Rev. 001
Nov/02
9. Reliability Information
Melexis devices are classified and qualified regarding suitability for infrared, vapor phase and wave
soldering with usual (63/37 SnPb-) solder (melting point at 183degC).
The following test methods are applied:

IPC/JEDEC J-STD-020A (issue April 1999)
Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices
CECC00802 (issue 1994)
Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed Quality
MIL 883 Method 2003 / JEDEC-STD-22 Test Method B102
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.

For more information on manufacturability/solderability see quality page at our website:
http://www.melexis.com/
10. ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 14 of 15
Data Sheet
Rev. 001
Nov/02
11. Package Information


MLX90251
Programmable Linear Hall Effect Sensor
3901090251
Page 15 of 15
Data Sheet
Rev. 001
Nov/02
12. Disclaimer

Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in
its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement.
Melexis reserves the right to change specifications and prices at any time and without notice. Therefore,
prior to designing this product into a system, it is necessary to check with Melexis for current information.
This product is intended for use in normal commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or high reliability applications, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional
processing by Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury,
property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or
use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow
out of Melexis' rendering of technical or other services.
2002 Melexis NV. All rights reserved.


For the latest version of this document,
go to our website at:
www.melexis.com
Or for additional inform ation contact Melexis Direct:
Europe and Japan:
All other locations:
Phone: +32 13 67 04 95
Phone: +1 603 223 2362
E-mail: sales_europe@melexis.com
E-mail: sales_usa@melexis.com




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