A3425L Ver la hoja de datos (PDF) - Allegro MicroSystems
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A3425L Datasheet PDF : 21 Pages
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A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Typical Applications Circuits
This device requires minimal protection circuitry
during operation with a low-voltage regulated line.
The on-chip voltage regulator provides immunity
to power supply variations between 3.3 and 18 V.
Because the device has open-drain outputs, pull-up
resistors must be included.
protection is generally required to protect the device
against supply-side transients. Specifications for such
transients vary for each application, so the design of
the protection circuit should be optimized for each
application.
If protection against coupled and injected noise is
required, then a simple low-pass filter on the supply
(RC) and a filtering capacitor on each of the outputs
may also be needed, as shown in the unregulated
supply diagram.
For applications in which the device receives its power
from unregulated sources, such as a car battery, full
For example, the circuit shown in the unregulated
supply diagram includes a Zener diode that offers high
voltage load-dump protection and noise filtering by
means of a series resistor and capacitor. In addition, it
includes a series diode that protects against high-volt-
age reverse battery conditions.
VSupply
2
OUTPUTA
A3425
1
3
VCC
OUTPUTB
GND
0.1 uF
4
VOUTPUTB
VOUTPUTA
Regulated supply
VSupply
100 Ω
2
OUTPUTA
1
A3425
3
VCC
OUTPUTB
GND
4
0.1 uF
VOUTPUTB
VOUTPUTA
Unregulated supply
Allegro MicroSystems, Inc.
9
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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