Product category:
Position, speed and torque measurement
News Release from: Allegro MicroSystems Europe | Subject: ATS643LSH
Edited by the Processingtalk Editorial
Team on 22 June 2004
Gear-tooth sensor for rotation speed
measurement
The new ATS643LSH from Allegro MicroSystems is a Hall-effect gear-tooth sensor module that is ideal for obtaining speed and duty-cycle information in applications such as transmission speed sensing
The new ATS643LSH from Allegro MicroSystems Europe is a Hall-effect gear-tooth sensor module that is ideal for obtaining speed and duty-cycle information in automotive applications such as transmission speed sensing The new device combines a Hall-effect sensor IC and magnet in an optimised configuration to provide a user-friendly solution for true zero-speed digital gear-tooth sensing in two-wire applications
This article was originally published on Processingtalk on 2 Feb 2004 at 8.00am (UK)
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It consists of a single-shot moulded plastic package that includes a samarium cobalt magnet, a pole piece, and the Hall-effect IC optimised to the magnetic circuit.
The integrated circuit incorporates a dual-element Hall-effect sensor and signal-processing circuitry that switches in response to differential magnetic signals created by ferrous targets.
The device contains a sophisticated compensating circuit to eliminate magnet and system offsets.
Digital tracking of the analogue signal is used to achieve true zero-speed operation.
A/D and D/A convertors are used to adjust the device gain and offset at power-up, resulting in switch points, which are independent of the airgap and hence greatly improved output accuracy.
The regulated current output is configured for two-wire operation, and the unit maintains a precise duty cycle over a wide temperature range.
Power-up time is less than 2 ms.
Other features include internal automatic gain control and reference adjustment circuitry, a supply voltage range from 4 to 24 V, and undervoltage lockout.
The small package (8 mm diameter x 5.5 mm long) can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes, and is immune to the effects of vibration.
Operating temperature range is -40C to +150C.
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