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Related Links:

Datasheets:
A1642: Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor with Continuous Calibration (PDF)

Selection Guides:
Hall-Effect Sensors,

Gear-Tooth Hall-Effect Speed Sensors

when this product is updated

A1642
Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor with Continuous Calibration

Features and Benefits

• Running mode calibration for continuous optimization
• Single chip IC for high reliability
• Internal current regulator for 2-wire operation
• 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 A1642 is an optimized Hall effect sensing integrated circuit that provides a user-friendly solution for true zero-speed digital ring-magnet sensing in two-wire applications. This small package can be easily assembled and used in conjunction with a wide variety of target shapes and sizes.

The integrated circuit incorporates a dual-element Hall effect sensor and signal processing that switches in response to differential magnetic signals created by ring magnet poles. The circuitry contains a sophisticated digital circuit to reduce system offsets, to calibrate the gain for air-gap–independent switchpoints, and to achieve true zero-speed operation. Signal optimization occurs at power-on 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 micro-oscillations of the target or sudden air gap changes.

The regulated current output is configured for two-wire applications and the sensor is ideally suited for obtaining speed and duty cycle information in ABS (antilock braking systems). The 1.5 mm spacing between the dual Hall elements is optimized for fine pitch ring-magnet-based configurations. For applications requiring sensing of rotating ferrous gears and targets, refer to the ATS642LSH series of products. The package is lead (Pb) free, with 100% matte tin leadframe plating.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A1642LK-I1-T	4-pin SIP	Yes	view data	-40 °C to  150 °C		samples not available
A1642LKNTN-I1-T	4-pin SIP	Yes	view data	-40 °C to  150 °C		samples not available
A1642LK-I2-T	4-pin SIP	Yes	view data	-40 °C to  150 °C		samples not available
A1642LKNTN-I2-T	4-pin SIP	Yes	view data	-40 °C to  150 °C		samples not available

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.