HAL506 Datasheet, PDF(5/44 Page) List of Unclassifed Manufacturers – Hall Effect Sensor Family

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

HAL506 Datasheet, PDF (5/44 Pages) List of Unclassifed Manufacturers – Hall Effect Sensor Family

◁

HAL5xx

2. Functional Description

The HAL 5xx sensors are monolithic integrated circuits

which switch 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 decreasing induction

of magnets at higher temperatures. If the magnetic field

exceeds the threshold levels, the open drain output

switches to the appropriate state. The built-in hysteresis

eliminates oscillation and provides switching behavior of

output without bouncing.

Magnetic offset caused by mechanical stress is com-

pensated for by using the âswitching offset compensa-

tion techniqueâ. Therefore, an internal oscillator pro-

vides a two phase clock. The Hall voltage is sampled at

the end of the first phase. At the end of the second

phase, both sampled and actual Hall voltages are aver-

aged and compared with the actual switching point. Sub-

sequently, the open drain output switches to the ap-

propriate state. The time from crossing the magnetic

switching level to switching of output can vary between

zero and 1/fosc.

Shunt protection devices clamp voltage peaks at the

Output-Pin and VDD-Pin together with external series

resistors. Reverse current is limited at the VDD-Pin by an

internal series resistor up to â15 V. No external reverse

protection diode is needed at the VDD-Pin for reverse

voltages ranging from 0 V to â15 V.

HALL55xxxx

VDD

1

Reverse

Voltage &

Overvoltage

Temperature

Dependent

Bias

Hysteresis

Control

Short Circuit &

Overvoltage

Protection

Protection

Hall Plate

Switch

Comparator

Output

OUT

3

GND

2

Clock

Fig. 2â1: HAL5xx block diagram

fosc

t

B

BON

t

VOUT

VOH

VOL

t

IDD

1/fosc = 16 Âµs

Fig. 2â2: Timing diagram

tf

t

Micronas

5

▷