PRODUCT INFORMATION
HAL 710/730
Available Types and Switching Behavior
Type
HAL 710
HAL 730
Direction Output: Definition of Output State
Output high, when edge of comparator 1 precedes
edge of comparator 2
Output high, when edge of comparator 2 precedes
edge of comparator 1
May/2007
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 increases
the supply voltage of the Hall plates and
adjusts the switching points to the decreas-
ing induction of magnets at higher tempera-
tures. If the magnetic field exceeds the
threshold levels, the open-drain output
switches to the appropriate state. The built-
in hysteresis eliminates oscillation and pro-
vides switching behavior of output without
bouncing.
Magnetic offset caused by mechanical
stress is compensated for by using the
“switching offset compensation technique”.
Therefore, an internal oscillator provides a
two phase clock. The Hall voltage is sam-
pled at the end of the first phase. At the end
of the second phase, both sampled and
actual Hall voltages are averaged and com-
pared with the actual switching point.
4
GND
1
V
DD
Reverse
Voltage and
Overvoltage
Protection
Temperature
Dependent
Bias
Hysteresis
Control
Test-Mode
Control
Short Circuit
and
Overvoltage
Protection
Hall Plate 1
Comparator
3
Switch
S1
Output
Count Output
Hall Plate 2
Comparator
Clock
S2
Switch
Direction
Detection
2
Output
Direction Output
Fig. 1:
Block diagram of the HAL 710/730
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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.
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without the express written consent of Micronas GmbH.
Edition May 7, 2007; Order No. PI000115-001EN
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