HAL700, HAL740
Dual Hall-Effect Sensors with Independent Outputs
Release Note: Revision bars indicate significant
changes to the previous edition.
1. Introduction
The HAL700 and the HAL740 are monolithic CMOS
Hall-effect sensors consisting of two independent
switches controlling two independent open-drain out-
puts. 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 automo-
tive 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 HAL700 and the HAL740 are available in the
SMD-package SOT89B-2.
Unipolar Sensors:
1.1. 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
Type
HAL700
HAL740
Switching Behavior
S1: latching
S2: latching
1.2. Family Overview
DATA SHEET
The types differ according to the switching behavior of
the magnetic switching points at the both Hall plates
S1 and S2.
See
Page
S1: unipolar north sensitive
S2: unipolar south sensitive
Latching Sensors:
The output turns low with the magnetic south pole on
the branded side of the package. The output maintains
its previous state if the magnetic field is removed. For
changing the output state, the opposite magnetic field
polarity must be applied.
In case of a south-sensitive switch, the output turns
low with the magnetic south pole on the branded side
of the package and turns high if the magnetic field is
removed. The switch does not respond to the
magnetic north pole on the branded side.
In case of a north-sensitive switch, the output turns low
with the magnetic north pole on the branded side of
the package and turns high if the magnetic field is
removed. The switch does not respond to the mag-
netic south pole on the branded side.
4
Nov. 30, 2009; DSH000029_002EN
Micronas
MICRONAS [ MICRONAS ]
