A3230 查看數據表（PDF） - Allegro MicroSystems
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A3230 Datasheet PDF : 12 Pages
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A3230
Chopper-Stabilized Hall Effect Bipolar Switch
exhibiting negative switch behavior operate in a similar but
opposite manner. A north polarity field of sufficient strength,
> BRP, (more north than BRP) is required for operation, although
the result is that VOUT switches high, as shown in panel C. When
the field is reduced beyond the BOP level, the device switches
back to the low state.
The A3230 is designed to attain a small hysteresis, and thereby
provide more sensitive switching. Although this means that
true latching behavior cannot be guaranteed in all cases, proper
switching can be ensured by use of both south and north mag-
netic fields, as in a ring magnet.
Bipolar devices adopt an indeterminate output state when
powered-on in the absence of a magnetic field or in a field that
lies within the hysteresis band of the device. The correct state is
attained after the first excursion beyond BOP or BRP.
For more information on Bipolar switches, refer to Application
Note 27705, Understanding Bipolar Hall Effect Sensors.
Applications
It is strongly recommended that an external bypass capacitor be
connected (in close proximity to the Hall sensor) between the
supply and ground of the device to reduce both external noise
and noise generated by the chopper stabilization technique. As is
shown in Panel B of figure 1, a 0.1μF capacitor is typical.
Extensive applications information on magnets and Hall-effect
sensors is available in:
• Hall-Effect IC Applications Guide, AN27701,
• Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead
Welding and Lead Forming, AN27703.1
• Soldering Methods for Allegro’s Products – SMT and Through-
Hole, AN26009
All are provided in Allegro Electronic Data Book, AMS-702 and
the Allegro Web site: www.allegromicro.com
Allegro MicroSystems, Inc.
8
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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