Product category:
Analogue and Mixed Signal ICs
News Release from: Allegro MicroSystems Europe | Subject: A3064LKA
Edited by the Electronicstalk Editorial
Team on 20 May 2002
Monolithic Hall-effect gear-tooth sensor
IC
The new A3064LKA from Allegro MicroSystems is an AC-coupled Hall-effect gear-tooth sensor implemented as a monolithic integrated circuit.
The new A3064LKA from Allegro MicroSystems is an AC-coupled Hall-effect gear-tooth sensor implemented as a monolithic integrated circuit The new device switches in response to changing differential magnetic fields created by moving ferrous targets
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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It is ideally suited to use in non-zero-speed, gear-tooth-based sensing of speed, position, and timing in automotive applications such as antilock braking systems, transmissions, and crankshafts.
When coupled with a back-biasing magnet, the sensor can be configured to turn on or off with the leading or trailing edge of a gear tooth or slot.
Changes in fields on the magnet face caused by a moving ferrous mass are sensed by two integrated Hall transducers, and are differentially amplified by on-chip electronics.
The differential sensing approach provides immunity to radial vibration within the device's operating airgap.
Steady-state magnet and system offsets are eliminated using an on-chip differential bandpass filter.
This filter also provides relative immunity to interference from RF and electro-magnetic sources.
The use of on-chip temperature compensation and Schmitt trigger circuitry minimises shifts in effective working airgaps and switch points over temperature, allowing operation down to low frequencies over a wide range of airgaps and temperatures.
Each Hall-effect digital integrated circuit includes a voltage regulator, two quadratic Hall-effect sensing elements, temperature compensating circuitry, a low-level amplifier, bandpass filter, Schmitt trigger, and an open-collector output driver.
The onboard regulator permits operation with supply voltages from 4.5 to 24V.
The output stage can easily switch 20mA over the full frequency response range of the sensor, and is compatible with bipolar and MOS logic circuits.
Other features include operation at frequencies of up to 30kHz, excellent resistance to electromagnetic interference, reverse battery protection, and rugged construction to withstand physical stress.
The A3064LKA is supplied in a 5-pin plastic single-inline package.
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