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Datasheet: MLX90217 (Melexis, Inc.)

Hall-effect Cam Sensor

 

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3901090217
Page 1
Aug/02
Rev. 008
Description
The MLX90217 is a self adjusting digital output
rotary position gear tooth sensor designed for use
in automotive camshaft sensing as well as other
speed sensing applications. It is designed to be
used with a bias magnet south facing the back
(non-marked) side of the IC. The device has an
open collector output which is short circuit
protected.

The MLX90217 is a sophisticated IC featuring an
on-chip 10-bit A/D Converter and logic that acts
as a digital sample and hold circuit. A separate 4-
bit A/D converter provides a fixed hysteresis. The
90217 does not have a chopper delay. The 90217
uses a single Hall plate which is immune to rotary
alignment problems. The bias magnet can be
from 50 to 400mT.

As the signal is sampled, the logic recognizes an
increasing or decreasing flux density. The output
will turn on (BOP) after the flux has reached its
peak and decreased by an amount equal to the
hysteresis. Similarly the output will turn off (BOP)
after the flux has reached its minimum value and
increased by an amount equal to the hysteresis
.
Functional Diagram
Pin 1 - V
DD
(Supply)
Pin 2 - V
SS
(Ground)
Pin 3 - Output
Amplifier
Voltage
Regulator
A
D
C
A
D
C
Logic
Protected
Output
1
2
3
Hall
Plate
1
0
-
B
i
t
4
-
B
i
t
Features and Benefits
s
Rotary Position Gear Tooth Sensor
s
Short Circuit Protection
s
On-chip 10 bit A/D Converter
s
Self-Adjusting Magnetic Range
s
High Speed Operation
s
No Chopper Delay
s
Zero Speed Detection
s
No Rotary Orientation Concerns
Applications
s
Camshaft Sensor
s
Geartooth Sensor
s
Linear Encoder
s
Rotary Encoder
s
Direction Detection*
*See applications example

Ordering Information
Part No.
Temperature Suffix
Package Code
MLX90217
L (-40
o
C to 150
o
C) UA (TO-92 flat)
Note:
Static sensitive device, please observe ESD
precautions.
3901090217
Page 2
Aug/02
Rev. 008
MLX90217 Electrical Specifications
DC Operating Parameters T
A
= -40
o
C to 150
o
C, V
DD
= 3.5V to 24V (unless otherwise specified).
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Supply Voltage
V
DD
Operating
3.5
-
24
V
Supply Current
I
DD
V
DD
= 12V
1.5
3.0
4.5
mA
Supply Current
I
DD
V
DD
= 3.5V to 24V
1
-
6
mA
Leakage Current
I
LEAK
V
OUT
= 3.5V to 24V
-
-
10
A
Output Current
I
OUT
Operating
-
-
25
mA
Output Saturation Voltage
V
SAT
V
DD
= 12V, I
OUT
= 25mA
-
-
600
mV
Output Short Circuit Current
I
FAULT
Fault
50
100
150
mA
Output Short Circuit Shutdown
T
FAULT
Fault
100
-
200
S
Clock Frequency
f
CLK
Operating
300
500
800
kHz
Output Rise Time
t
r
V
DD
=12V R
1
= 880W C
1
= 20pf
-
400
nS
Output Fall Time
t
f
V
DD
=12V R
1
= 880W C
1
= 20pf
-
400
nS
Bandwidth
BW
Operating
-
-
15
kHz
Thermal Resistance
R
TH
Operating
-
-
200
o
C/Watt
MLX90217 Magnetic Specifications
DC Operating Parameters T
A
= -40
o
C to 150
o
C, V
DD
= 3.5V to 24V (Unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Back Bias Range
B
BIAS
Operating
-30
-
400
mT
Linear Region
V
DD
= 12V
50
-
500
mT
Hysteresis
B
hys
V
DD
= 3.5V to 24V
1.8
3.5
10
mT
1 mT = 10 Gauss
3901090217
Page 3
Aug/02
Rev. 008
500
F
l
u
x

D
e
n
s
i
t
y

a
t

H
a
l
l

P
l
a
t
e

(
m
T
)
Time
Switch Points
versus
Analog Magnetic Signal
(Cam Lobe)
MLX90217
100
200
300
400
Output
Signal
500
F
l
u
x

D
e
n
s
i
t
y

a
t

H
a
l
l

P
l
a
t
e

(
m
T
)
Time
Switch Points
versus
Irregular Magnetic Signal
(Worn Gear)
MLX90217
100
200
300
400
Output
Signal
500
F
l
u
x

D
e
n
s
i
t
y

a
t

H
a
l
l

P
l
a
t
e

(
m
T
)
Time
Switch Points
versus
Regular Magnetic Signal
(New Gear)
MLX90217
100
200
300
400
Output
Signal
Performance Graphs
Absolute Maximum Ratings
Supply Voltage (Operating), V
DD
30V
Supply Current (Fault), I
DD
50mA
Output Current (Fault), I
OUT
30mA
Output Current (Fault), I
fault
50mA
Output Voltage, V
OUT
30V
Power Dissipation, P
D
100mW
Operating Temperature Range, T
A
40C to 150C
Storage Temperature Range, T
S
65C to 150C
Maximun Junction Temp, T
J
175C
ESD Sensitivity
+/- 7KV
3901090217
Page 4
Aug/02
Rev. 008
Application Notes
Maximum dynamic range is 500 mT. The
hysteresis is fixed at 5.0 mT. Best angular
accuracy will be obtained when the magnetic
circuit provides peak magnetic flux at the chip
near the high end of the linear range of 500 mT.
EMC protection using external components are
recommended. Two possibilities are shown on
the following page. Normally the South pole faces
the unbranded side of the device. A North pole
will enable a test sequence used in factory
testing.
Unique Features
The output is reset to the high state at power on
(output driver is off) whatever the field is. The
output only changes after the first min is detected.
The reset state holds no information about the
field. If the supply of the chip is raised slowly, the
reset state is not stable. This has been observed
at 0 field but it should be the same with small and
large fields.

Gear tooth sensors often need to be adjusted
after the module is assembled to align the
magnet with differential Hall plates or orient with
teeth. However the MLX90217 is "self adjusting"
over a wide range of back bias flux eliminating
the need for any trimming in the application. The
magnet may be glued to the back surface (non
branded side) of the IC using a cyanoacrylate
adhesive or suitable epoxy.
3901090217
Page 5
Aug/02
Rev. 008
Applications Examples
Edge Sensing (unidirectional)
S N
S N
Lobe Sensing (bidirectional)
Clockwise
Counter Clockwise
CW
CCW
B
RP
B
OP
B
RP
B
OP
B
RP
B
OP
B
OP
Flux Concentration - Tooth Position
Flux Concentration - Valley Position
S N
S N
Severe Environment and
Automotive Protection Circuit
V
DD
In severe cases it may be necessary to include a Zener diode to clamp positive
interference and Schottky diodes to clamp negative excursions.
C2
R2
R1 = 5.6k
R2 =332
C1 = 10nF
C2 = 2.2nF
MLX
90217
V
DD
C1
R1
Output
MLX
90217
Recommended Wiring and
Minimum Protection Circuit
V
DD
C1
R1
Output
R1 = 5.6k
C1 = 10nF
3901090217
Page 6
Aug/02
Rev. 008
Physical Characteristics
17AB
4936
2
1
3
17AB
4936
1
2
3
All Dimensions in millimeters
2.13
1.87
0.45
0.41
Marked
Surface
1.53
1.27
UA Hall Plate / Chip Location
UA Marking and Pinout
First line (17) = part number of 90217.
First Line (AB) = series & die revision.
Pin 1 - VDD (Supply)
Pin 2 - VSS (GND)
Pin 3 - Output (open collector)
1.60
1.40
45
o
Typical
4.30
3.90
2.64
2.34
0.84
0.63
3.20
2.80
1.75
1.55
0.48
0.43
0.20
0.00
0.41
0.35
1.30
1.24
2.57
2.51
5
o
Typical
45
o
Typical
0.38
Typical
(see note 3)
15.5
14.5
0.41
0.35
NOTES:
1-Controling Dimension: mm
2-Leads must be free of flash and
plating voids
3-Leads must not arc toward
the rear of package
UA Package Dimensions
Second Line: Lot & Date Code.
(4) = Lot Identification.
(9) = Year 1999.
(36) = Week of Year.
3901090217
Page 7
Aug/02
Rev. 008
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/
ESD Procautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor
products.
Reliability Information
3901090217
Page 8
Aug/02
Rev. 008
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appear-
ing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description re-
garding the information set forth herein or regarding the freedom of the described devices from pat-
ent infringement. Melexis reserves the right to change specifications and prices at any time and with-
out 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 specifi-
cally 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 in-
jury, 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, perform-
ance 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 information 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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