The HAL® 700 and the HAL® 740 are monolithic CMOS Hall-effect sensors consisting of two independent switches controlling two independent open-drain outputs. The Hall plates of the two switches are spaced 2.35 mm apart.
The devices include temperature compensation and active offset compensation. These features provide excellent stability and matching of the switching points in the presence of mechanical stress over the whole temperature and supply voltage range.
The sensors are designed for industrial and automotive applications and operate with supply voltages from 3.8 V to 24 V in the ambient temperature range from -40 °C up to 125 °C.
The HAL 700 and the HAL 740 are available in the SMD-package SOT89B-2.
Block diagram
System Architecture
The HAL 700 and the HAL 740 are monolithic integrated circuits with two independent subblocks each consisting 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 is compared with the actual threshold level in the comparator. The subblocks are designed to have closely matched switching points. The output of comparator 1 attached to S1 controls the open drain output at Pin 3. Pin 2 is set according to the state of comparator 2 connected to S2.
HAL 700 and HAL 740 block diagram
Features
Main Features
Two independent Hall-switches
Distance of Hall plates: 2.35 mm
Switching offset compensation at typically 150 kHz
Operation from 3.8 V to 24 V supply voltage
Operation with static 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 ISO 7637
Family members
Family Overview
The types differ according to the switching behavior of the magnetic switching points at the both Hall plates S1 and S2.
Feature
HAL 700
HAL 740
Switching Behavior
S1: latching S2: latching
S1: unipolar north sensitive S2: unipolar south sensitive
