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AATS643LSH_06 Datasheet

  • AATS643LSH_06

  • Self-Calibrating, Zero-Speed Differential Gear Tooth Sensor ...

  • 16頁

  • ALLEGRO   ALLEGRO

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ATS643LSH
Self-Calibrating, Zero-Speed Differential
Gear Tooth Sensor with Continuous Update
Features and Benefits
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Fully-optimized differential digital gear tooth sensor
Single chip-IC for high reliability
Internal current regulator for 2-wire operation
Small mechanical size (8 mm diameter x 5.5 mm depth)
Switchpoints air gap independent
Digital output representing gear profile
Precise duty cycle accuracy throughout temperature
range
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Large operating air gaps
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<2 ms power-on time
Description
The ATS643 is an optimized combination of integrated circuit
and magnet that provides a manufacturer-friendly solution
for true zero-speed digital gear-tooth sensing in two-wire
applications. The device consists of a single-shot molded
plastic package that includes a samarium cobalt magnet, a
pole piece, and a Hall-effect IC that has been optimized to the
magnetic circuit and the automotive environment. This small
package can be easily assembled and used in conjunction with
a wide variety of gear shapes and sizes.
The integrated circuit incorporates a dual element Hall-effect
sensor with signal processing circuitry that switches in response
to differential magnetic signals created by rotating ferrous
targets. The device contains a sophisticated compensating
circuit to eliminate magnet and system offsets immediately
at power-on. Digital tracking of the analog signal is used
to achieve true zero-speed operation, while also setting the
device switchpoints. The resulting switchpoints are air gap
independent, greatly improving output and duty cycle accuracy.
The device also uses a continuous update algorithm to fine-
tune the switchpoints while in running mode, maintaining
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Packages: 4 pin SIP (suffix SH)
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Not to scale
Functional Block Diagram
VCC (Pin 1)
Hall AMP
Offset Adjust
AGC
Internal
Regulator
PDAC
ThresholdP
Reference
Generator
and Updates
ThresholdN
NDAC
Threshold
Logic
GND (Pin 4)
ATS643-DS, Rev. 2

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