HAL320
DATA SHEET
Differential Hall Effect Sensor IC
1.1. Features:
in CMOS technology
– distance between Hall plates: 2.25 mm
Release Notes: Revision bars indicate significant
changes to the previous edition.
– operates from 4.5 V to 24 V supply voltage
– switching offset compensation at 62 kHz
– overvoltage protection
1. Introduction
– reverse-voltage protection at V -pin
DD
The HAL320 is a differential Hall switch produced in
CMOS technology. The sensor includes 2 temperature-
compensated Hall plates (2.25 mm apart) with active off-
set compensation, a differential amplifier with a Schmitt
trigger, and an open-drain output transistor (see Fig.
2–1).
– short-circuit protected open-drain output by thermal
shutdown
– operates with magnetic fields from DC to 10 kHz
– output turns low with magnetic south pole on branded
side of package and with a higher magnetic flux densi-
ty in sensitive area S1 as in S2
The HAL320 is a differential sensor which responds to
spatial differences of the magnetic field. The Hall volt-
– on-chip temperature compensation circuitry mini-
mizes shifts of the magnetic parameters over temper-
ature and supply voltage range
ages at the two Hall plates, S and S , are amplified with
1
2
a differential amplifier. The differential signal is
compared with the actual switching level of the internal
Schmitt trigger. Accordingly, the output transistor is
switched on or off.
– the decrease of magnetic flux density caused by rising
temperature in the sensor system is compensated by
a built-in negative temperature coefficient of hystere-
sis
The sensor has a bipolar switching behavior and re-
quires positive and negative values of ΔB = B – B for
correct operation.
S1
S2
– EMC corresponding to ISO 7637
1.2. Marking Code
Basically, there are two ways to generate the differential
signal ΔB:
All Hall sensors have a marking on the package surface
(branded side). This marking includes the name of the
sensor and the temperature range.
– Rotating a multi-pole-ring in front of the branded side
of the package (see Fig. 3–1, Fig. 3–2, and Fig. 3–3;
Please use HAL300 only).
– Back-bias applications:
1.3. Operating Junction Temperature Range (T )
J
A magnet on the back side of the package generates
a back-bias field at both Hall plates. The differential
signal ΔB results from the magnetic modulation of the
back-bias field by a rotating ferromagnetic target
(Please use HAL320 only).
The Hall sensors from Micronas are specified to the chip
temperature (junction temperature T ).
J
The HAL320 is available in the temperature range “A”
only.
The active offset compensation leads to constant mag-
netic characteristics over supply voltage and tempera-
ture.
A: T = –40 °C to +170 °C
J
The relationship between ambient temperature (T ) and
A
The sensor is designed for industrial and automotive ap-
plications and operates with supply voltages from 4.5 V
to 24 V in the ambient temperature range from –40 °C
up to 150 °C.
junction temperature (T ) is explained in section 4.1. on
J
page 20.
The HAL320 is an ideal sensor for target wheel applica-
tions, ignition timing, anti-lock brake systems, and revo-
lution counting in extreme automotive and industrial en-
vironments
The HAL320 is available in the SMD-package
SOT89B-2 and in the leaded versions TO92UA-3 and
TO92UA-4.
4
Micronas
MICRONAS [ MICRONAS ]
