Product category:
Sensors and Data Acquisition
News Release from: Allegro MicroSystems Europe | Subject: A1172
Edited by the Electronicstalk Editorial
Team on 07 May 2008
Hall-effect switch suits battery-powered
use
The A1172 can easily replace reed switches, providing superior reliability and ease of manufacturing while eliminating the requirement for signal conditioning.
The A1172 from Allegro MicroSystems Europe is an ultra-sensitive micropower Hall-effect switch with complementary, latched digital outputs and omnipolar magnetic actuation The new device features operation at low supply currents and voltages, making it ideal for battery-operated electronics
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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The combination of a low operating supply voltage (1.65 to 3.5V) and a clocking algorithm assists in reducing the average operating power consumption to less than 15mW with a 2.75V supply.
Unlike many Hall-effect switches, both north and south polarity magnetic fields of sufficient strength activate output switching to either 'off' or 'on'.
The A1172 incorporates two push-pull outputs configured so that one output switches off in the absence of sufficient magnetic field while the other output switches on in the absence of a magnetic field.
This polarity independence, as well as the minimal power requirement, allows the A1172 to easily replace reed switches, providing superior reliability and ease of manufacturing while eliminating the requirement for signal conditioning.
The A1172 includes, on a single silicon chip, a Hall-effect voltage generator, a small-signal amplifier, chopper stabilisation circuitry, a latch and a MOSFET output.
Chopper stabilisation provides improved stability through dynamic offset cancellation, reducing the residual offset voltage normally caused by device over moulding, temperature dependence and thermal stress.
This new device is designed to offer a magnetically optimised solution for battery-operated, consumer equipment and is available in a four-pin wafer level chip scale package measuring 1 x 1 x 0.5mm.
This package is smaller than most plastic packages, which reduces the printed circuit board area consumed by these switches.
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