HAL320 Datasheet, PDF (2/13 Pages) List of Unclassifed Manufacturers – Differential Hall Effect Sensor IC

HAL320
Differential Hall Effect Sensor IC
in CMOS technology
Introduction
The HAL 320 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).
The HAL 320 is a differential sensor which responds to
spatial differences of the magnetic field. The Hall volt-
ages at the two Hall plates, S₁ and S₂, are amplified with
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 sensor has a bipolar switching
behavior and requires positive and negative values of
∆B = B_S1 – B_S2 for correct operation.
Basically, there are two ways to generate the differential
signal ∆B:
– Rotating a multi-pole-ring in front of the branded side
of the package (see Fig. 4, Fig. 5, and Fig. 6).
– Back-bias applications:
A magnet on the back side of the package generates
a back-bias field at both Hall plates. The differential
signal ∆B results from the magnetic modulation of the
back-bias field by a rotating ferromagnetic target.
The active offset compensation leads to constant mag-
netic characteristics over supply voltage and tempera-
ture.
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.
The HAL 320 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 HAL 320 is available in two SMD-packages
(SOT-89A and SOT-89B) and in a leaded version
(TO-92UA).
Features:
– distance between Hall plates: 2.25 mm
– operates from 4.5 V to 24 V supply voltage
– switching offset compensation at 62 kHz
– overvoltage protection
– reverse-voltage protection of V_DD-pin
– 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
– on-chip temperature compensation circuitry mini-
mizes shifts of the magnetic parameters over temper-
ature and supply voltage range
– EMC corresponding to DIN 40839
Marking Code
Type
HAL 320SF,
HAL 320SO,
HAL 320UA
Temperature Range
A
E
C
320A
320E
320C
Operating Junction Temperature Range (T_J)
A: T_J = –40 °C to +170 °C
E: T_J = –40 °C to +100 °C
C: T_J = 0 °C to +100 °C
The relationship between ambient temperature (T_A) and
junction temperature (T_J) is explained on page 11.
Hall Sensor Package Codes
HAL XXXPA-T
Temperature Range: A, E, or C
Package: SF for SOT-89B
SO for SOT-89A
UA for TO-92UA
Type: 320
Example: HAL320UA-E
→ Type: 320
→ Package: TO-92UA
→ Temperature Range: T_J = –40 °C to +100 °C
Hall sensors are available in a wide variety of packaging
versions and quantities. For more detailed information,
please refer to the brochure: “Ordering Codes for Hall
Sensors”.
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Micronas