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Datasheets:
ATS643LSH: Self-Calibrating, Zero-Speed Differential Gear Tooth Sensor IC with Continuous Update (PDF)
Selection Guides:
Hall-Effect Sensor ICs,
Gear-Tooth Hall-Effect Speed Sensor ICs
Press Releases:
ATS643LSH: Allegro Microsystems, Inc. Introduces a Two-Wire Sensor IC Optimized to Address the Difficulties of Transmission Speed Sensing
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ATS643LSH
Self-Calibrating Zero-Speed Differential Gear Tooth Sensor ICs with
Continuous Update
Features and Benefits
- Fully-optimized differential digital gear tooth sensor IC
- Single chip-IC for high reliability
- Internal current regulator for 2-wire operation
- Small mechanical size (8 mm diameter × 5.5 mm depth)
- Switchpoints air gap independent
- Digital output representing gear profile
- Precise duty cycle accuracy throughout temperature range
- Large operating air gaps
- <2 ms power-on time
- AGC and reference adjust circuit
- True zero-speed operation
- Undervoltage lockout
- Wide operating voltage range
- Defined power-on state
Description
The ATS643 is an optimized combination of integrated circuit and rare-earth pellet 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 pellet, 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 IC with signal processing circuitry that switches in response to differential magnetic signals created by rotating ferromagnetic 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 finetune the switchpoints while in running mode, maintaining the device specifications even through large changes in air gap or temperature.
The regulated current output is configured for two-wire operation, offering inherent diagnostic information. This device is ideal for obtaining speed and duty cycle information in gear-tooth based applications such as transmission speed sensing.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| ATS643LSHTN-I1-T | 4-pin SIP | Yes | view data | -40 °C to 150 °C |
Contact Local Sales Representative or check distributor stock |
||
| ATS643LSHTN-I2-T | 4-pin SIP | Yes | view data | -40 °C to 150 °C |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.