PRODUCT INFORMATION
HAL 2xy
April/2009
HAL 2xy
Low-Cost Hall-Effect Sensor Family
The HAL 2xy Hall switch family is produced
in CMOS technology. The sensors include a
temperature-compensated Hall plate with
active offset compensation, a comparator,
and an open-drain output transistor.
The comparator compares the actual mag-
netic flux through the Hall plate (Hall volt-
age) with the fixed reference values (switch-
ing points). Accordingly, the output
transistor is switched on or off.
The active offset compensation leads to
magnetic parameters which are robust
against mechanical stress effects. In addi-
tion, the magnetic characteristics are con-
stant in the full supply voltage and tempera-
ture range.
The sensors are designed for industrial and
automotive applications and operate with
supply voltages from 3.8 V to 24 V in the
ambient temperature range from
−40 °C
up
to 125
°C.
The HAL 2xy family is available in the
SOT89B SMD package and in the leaded
TO92UA package.
Features
Major Applications
The HAL 2xy is the optimal system solution
for applications, such as:
V
V
V
V
V
V
V
V
Operates from 3.8 V to 24 V supply volt-
age
Operates with static magnetic fields and
dynamic magnetic fields up to 10 kHz
Overvoltage protection at all pins
Reverse-voltage protection at V
DD
pin
Magnetic characteristics are robust
against mechanical stress effects
Short-circuit protected open-drain out-
put by thermal shut down
Constant switching points over a wide
supply voltage and temperature range
The decrease of magnetic flux density
caused by rising temperature in the sen-
sor system is compensated by a built-in
negative temperature coefficient of the
magnetic characteristics
High temperature stability for automotive
or industrial applications
High ESD rating
V
V
V
V
V
Endposition detection
RPM measurement of motors in various
applications, such as power window
Brushless DC motors
RPM measurements in flow meters
Replacement of micro switches
V
V
PRODUCT INFORMATION
HAL 2xy
Available Types and Behavior
Type
HAL 201
HAL 202
HAL 203
HAL 204
HAL 206
HAL 207
HAL 208
HAL 210
HAL 220
HAL 221
Switching Behavior
unipolar
latching
latching
latching
unipolar
unipolar
unipolar
unipolar
latching
unipolar
Sensitivity
low
high
medium
low
high
low
medium
high
high
low
April/2009
Power-on and Undervoltage Reset
–
–
–
–
–
–
–
–
•
•
System Architecture
The Hall-effect sensor is a monolithic inte-
grated circuit that switches in response to
magnetic fields. If a magnetic field with flux
lines perpendicular to the sensitive area is
applied to the sensor, the biased Hall plate
forces a Hall voltage proportional to this
field. The Hall voltage is compared with the
actual threshold level in the comparator.
The temperature-dependent bias is used to
compensate the decreasing induction of
magnets at higher temperatures. If the mag-
netic field exceeds the threshold levels, the
open-drain output switches to the appropri-
ate state. The built-in hysteresis eliminates
oscillation and provides switching behavior
of output without bouncing.
Magnetic offset caused by mechanical
stress is compensated for by using the
“switching offset compensation technique”.
HAL2xy
V
DD
1
Reverse
Voltage &
Overvoltage
Protection
Temperature
Dependent
Bias
Hysteresis
Control
Short Circuit &
Overvoltage
Protection
Hall Plate
Switch
Comparator
Output
OUT
3
Clock
GND
2
Fig. 1:
Block diagram of the HAL 2xy
All information and data contained in this product information are without any commitment, are not to be consid-
ered as an offer for conclusion of a contract, nor shall they be construed as to create any liability. Product or
development sample availability and delivery are exclusively subject to our respective order confirmation form. By
this publication, Micronas GmbH does not assume responsibility for patent infringements or other rights of third
parties which may result from its use.
No part of this publication may be reproduced, photo-
copied, stored on a retrieval system, or transmitted
without the express written consent of Micronas GmbH.
Edition April 6, 2009; Order No. PI000010_002EN
Micronas GmbH
⋅
Hans-Bunte-Strasse 19
⋅
D-79108 Freiburg (Germany)
⋅
P.O. Box 840
⋅
D-79008 Freiburg (Germany)
Tel. +49-761-517-0
⋅
Fax +49-761-517-2174
⋅
E-mail: docservice@micronas.com
⋅
www.micronas.com
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