PRODUCT INFORMATION

HAL 710/730

May/2007

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.

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

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 May 7, 2007; Order No. PI000115-001EN

Available Types and Switching Behavior

Type

Direction Output: Definition of Output State

HAL 710

Output high, when edge of comparator 1 precedes

edge of comparator 2

HAL 730

Output high, when edge of comparator 2 precedes

edge of comparator 1

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.

Reverse

Voltage and

Overvoltage

Protection

Temperature

Dependent

Bias

Hysteresis

Control

Hall Plate 1

Switch

Comparator

1

Hall Plate 2

Switch

Comparator

Clock

Output

3

Count Output

Direction

Output

2

Direction Output

Short Circuit

and

Overvoltage

Protection

Test-Mode

Control

S1

S2

Detection

GND

4

Fig. 1: Block diagram of the HAL 710/730