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PDF HAL508 Data sheet ( Hoja de datos )
| Número de pieza | HAL508 | |
| Descripción | (HAL5xx) Hall Effect Sensor Family | |
| Fabricantes | Micronas | |
| Logotipo |  |
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MICRONAS
HAL501...506, 508, 509,
HAL516...519, 523
Hall Effect Sensor Family
Edition Feb. 14, 2001
6251-140895-42EDS
MICRONAS
1 page  
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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 “switching offset compensa-
tion technique”. 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 –15 V. No external reverse
protection diode is needed at the VDD-Pin for reverse
voltages ranging from 0 V to –15 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. 2–1: HAL5xx block diagram
fosc
B
BON
VOUT
VOH
VOL
IDD
t
t
t
1/fosc = 16 µs
Fig. 2–2: Timing diagram
tf t
Micronas
5
5 Page 
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mA HAL 5xx
5
IDD 4
3
VDD = 24 V
VDD = 12 V
2
VDD = 3.8 V
1
0
–50 0
50 100 150
TA
Fig. 3–6: Typical supply current
versus ambient temperature
200 °C
HAL5xx
kHz HAL 5xx
100
90
fosc 80
70
TA = 25 °C
60
TA = –40 °C
50 TA = 170 °C
40
30
20
10
0
0 5 10 15 20 25 30 V
VDD
Fig. 3–8: Typ. Internal chopper frequency
versus supply voltage
kHz HAL 5xx
100
90
fosc 80
70
VDD = 3.8 V
60
50 VDD = 4.5 V...24 V
40
30
20
10
0
–50 0
50 100 150 200 °C
TA
Fig. 3–7: Typ. internal chopper frequency
versus ambient temperature
Micronas
kHz HAL 5xx
100
90
fosc 80
70
TA = 25 °C
60 TA = –40 °C
50 TA = 170 °C
40
30
20
10
0
3 3.5 4.0 4.5 5.0 5.5 6.0 V
VDD
Fig. 3–9: Typ. internal chopper frequency
versus supply voltage
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HAL508.PDF ] | |
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