HAL1821UA-A Datasheet, PDF (6/14 Pages) Micronas – Linear Hall-Effect Sensor Family in SOT89B Package

HAL 1821...HAL 1823
DATA SHEET
2. Functional Description
2.1. General Function
The HAL182x is a monolithic integrated circuit which
provides an output voltage proportional to the mag-
netic flux through the Hall plate and proportional to the
supply voltage (ratiometric behavior).
The external magnetic field component perpendicular
to the branded side of the package generates a Hall
voltage. The Hall IC is sensitive to magnetic north and
south polarity. This voltage is amplified and stabilized
by a push-pull output transistor stage.
Internal temperature compensation circuitry and the
choppered offset compensation enables operation
over the full temperature range with minimal degrada-
tion in accuracy and offset. The circuitry also rejects
offset shifts due to mechanical stress from the pack-
age. In addition, the sensor IC is equipped with
devices for overvoltage and reverse-voltage protection
at supply pin.
Output/Magnetic Field Polarity
Applying a south-pole magnetic field perpendicular to
the branded side of the package will increase the out-
put voltage from the quiescent (offset) voltage towards
the supply voltage. A north pole magnetic field will
decrease the output voltage.
In addition HAL182x features an internal error detec-
tion. The following error modes can be detected:
– Over-/underflow in adder or multiplier
– Over-/underflow in A/D converter
– Overtemperature detection
In case of an over-underflow error the sensors output
will be forced to the lower error band. The error band is
defined by VDIAG (see Section 3.6. on page 10).
In case of overtemperature detection, the output is set
to high impedance.
V_SUP
Internally
stabilized
Supply and
Protection
Devices
Temperature
Dependent
Bias
Oscillator
Undervoltage
Detection
Protection
Devices
Switched
Hall Plate
A/D
Converter
Digital
Signal
Processing
D/A
Converter
Analog
Output
50 
OUT
GND
Calibration Control
Fig. 2–1: HAL182x block diagram
6
Aug. 2, 2013; DSH000162_001EN
Micronas