Features: generation of 'Count Signals' and 'Direction Signals'
delay of the 'Count Signals' with respect to the 'Direction Signal' of 1 s minimum
switching type latching
low sensitivity
typical BON: 14.9 mT at room temperature
typical BOFF: −14.9 mT at room temperature
temperature coefficient of −2000 ppm/K in all magnetic characteristics
switching offset compensation at typically 150 kHz
operation from 3.8 V to 24 V supply voltage
operation with static magnetic fields and dynamic magnetic fields up to 10 kHz
overvoltage protection at all pins
reverse-voltage protection at VDD-pin
robustness of magnetic characteristics against mechanical stress
short-circuit protected open-drain outputs by thermal shut down
constant switching points over a wide supply voltage range
EMC corresponding to DIN 40839ApplicationThe HAL 710 is the optimal sensor for position-control applications with direction detection and alternating magnetic signals such as:
multipole magnet applications,
rotating speed and direction measurement,
position tracking (active targets), and
window lifters.
Specifications
|
Symbol |
Parameter |
Pin No. |
Min. |
Max. |
Unit |
|
VDD |
Supply Voltage |
1 |
-15 |
281) |
V |
|
-VP |
Test Voltage for Supply |
1 |
242) |
281) |
V |
|
-IDD |
Reverse Supply Current |
1 |
- |
501) |
mA |
|
IDDZ |
Supply Current through
Protection Device |
1 |
-1003) |
1003) |
mA |
|
VO |
Output Voltage |
2,3 |
-0.3 |
281) |
V |
|
IO |
Continuous Output On Current |
2,3 |
- |
201) |
mA |
|
IOmax |
Continuous Output Current |
2,3 |
- |
1503) |
mA |
|
IOZ |
Output Current through
Protection Device |
3 |
2003) |
2003) |
mA |
|
TS |
Storage Temperature Range |
|
-65 |
1505) |
°C |
|
TJ |
Junction Temperature Range |
|
-40
-40 |
1704)
150 |
°C |
1) as long, as TJmax is not exceeded
2) with a 220- series resistance at pin 1 corresponding to test circuit 1
3) t < 2 ms
4) t < 1000 h
5) Components stored in the original packaging should provide a shelf life of at least 12 months, starting from the date code printed on the labels, even in environments as extreme as 40 °C and 90% relative humidity.
DescriptionThe HAL710 is a monolithic integrated circuit with two independent subblocks consisting each of a Hall plate and the corresponding comparator. Each subblock independently switches the comparator output in response to the magnetic field at the location of the corresponding sensitive area. If a magnetic field with flux lines perpendicular to the sensitive area is present, the biased Hall plate generates a Hall voltage proportional to this field. The Hall voltage of HAL710 is compared with the actual threshold level in the comparator. The subblocks are designed to have closely matched switching points.
The temperature-dependent bias common to both subblocks 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 of HAL710 exceeds the threshold levels, the comparator switches to the appropriate state. The built-in hysteresis prevents oscillations of the outputs.
In order to achieve good matching of the switching points of both subblocks, the magnetic offset caused by mechanical stress is compensated for by use of "switching offset compensation techniques". Therefore,an internal oscillator in HAL710 provides a two-phase clock to both subblocks. For each subblock 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 averaged and compared with the actual switching point.
The output of HAL710 comparator 1 (connected to S1) directly controls the 'Count Output'. The outputs of both comparators enter the 'Direction Detection Block' controlling the state of the 'Direction Output'. The 'Direction Output' is 'high' if the edge at the output of comparator 1 precedes that at comparator 2. In the opposite case, 'Direction Output' is 'low'. The previous state of the 'Direction Output' is maintained between edges of the 'Count Output' and in case the edges at comparator 1 and comparator 2 occur in the same clock period.
Shunt protection HAL710 devices clamp voltage peaks at the output pins 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.
HAL710 Data Sheet
