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Datasheets:
ATS642LSH: Two-Wire True Zero Speed Miniature Peak-Detecting Gear Tooth Sensor IC with Continuous Calibration (PDF)
Selection Guides:
Hall-Effect Sensor ICs,
Gear-Tooth Hall-Effect Speed Sensor ICs
Press Releases:
ATS642LSH: Allegro MicroSystems, Inc. Introduces True Zero-Speed Digital Speed Sensor IC
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ATS642LSH
Two-Wire True Zero Speed Miniature Differential Peak-Detecting Gear
Tooth Sensor IC with Continuous Calibration
These parts are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Date of status change: May 4, 2009.
For existing customer transition, and for new customers or new applications, refer to the ATS682.
Features and Benefits
- Running mode calibration for continuous optimization
- Single chip IC for high reliability
- Internal current regulator for 2-wire operation
- Small mechanical size (8 mm diameter × 5.5 mm depth)
- Precise duty cycle signal over operating temperature range
- Large operating air gaps
- Automatic Gain Control (AGC) for air gap independent switchpoints
- Automatic Offset Adjustment (AOA) for signal processing optimization
- True zero-speed operation
- Undervoltage lockout
- Wide operating voltage range
Description
The ATS642 is an optimized Hall IC providing a user-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. This small package, with optimized two-wire leadframe, 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 and signal processing that switches in response to differential magnetic signals created by ferrous gear teeth. The circuitry contains a sophisticated digital circuit to reduce magnet and system offsets, to calibrate the gain for air gap independent switchpoints, and to achieve true zero-speed operation. Signal optimization occurs at power-up through the combination of offset and gain adjust and is maintained throughout the operating time with the use of a running mode calibration. The running mode calibration allows immunity to environmental effects such as microoscillations of the target or sudden air gap changes.
The regulated current output is configured for two wire applications and the device is ideally suited for obtaining speed and duty cycle information in ABS (antilock braking systems). The 1.5 mm Hall element spacing is optimized for fine pitch gear-tooth-based configurations. The package is lead (Pb) free, with 100% matte tin leadframe plating.
For a SIP package, please see the A1642LK.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| ATS642LSHTN-I1-T | 4-pin SIP | Yes | view data | -40 °C to 150 °C | not for new design |
Contact Local Sales Representative or check distributor stock |
|
| ATS642LSHTN-I2-T | 4-pin SIP | Yes | view data | -40 °C to 150 °C | not for new design |
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.