Micronas > HAL 700/740: Dual Hall-Effect Sensors with Independent Output

HAL 700/740: Dual Hall-Effect Sensors with Independent Outputs

HAL 700/740 Description

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

HAL 700/740 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 700/740 Block Diagram

*Datasheets may be updated without notification

HAL 700/740 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 V DD-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