Allegro MicroSystems Inc. AC Coupled Differential Geartooth Sensor A1425LK-T

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AC Coupled Differential Geartooth Sensor - A1425LK-T - Allegro MicroSystems Inc.
Manchester, NH, United States
AC Coupled Differential Geartooth Sensor A1425LK-T
Description The A1425 AC-coupled Hall-effect sensor IC is a monolithic integrated circuit that switches in response to changing differential magnetic fields created by rotating ring magnets and, when coupled with a magnet, by ferrous targets. The device is a true zero-crossing detector: the output switches precisely when the difference in magnetic field strength between the two Hall elements is zero. A unique dual-comparator scheme provides for accurate switching at the zero crossing on both the positive and negative-going regions of the differential signal, while utilizing hysteresis to prevent false switching. The zero-crossing nature of this device provides excellent repeatability and accuracy for crankshaft applications. Changes in field strength at the device face, which are induced by a moving target, are sensed by the two integrated Hall transducers. The transducers generate signals that are differentially amplified by on-chip electronics. This differential design provides immunity to radial vibration within the operating air gap range of the A1425, by rejection of the common mode signal. Steady-state magnet and system offsets are eliminated using an on-chip differential band-pass filter. This filter also provides relative immunity to interference from electromagnetic sources. The device utilizes advanced temperature compensation for the high-pass filter, sensitivity, and Schmitt trigger switchpoints, to guarantee optimal operation to low frequencies over a wide range of air gaps and temperatures. Each Hall effect digital integrated circuit includes a voltage regulator, two Hall effect elements, temperature compensating circuitry, a low-level amplifier, band-pass filter, Schmitt trigger, and an output driver, which requires a pull-up resistor. The onboard regulator permits operation with supply voltages from 4.0 to 26.5 V. The output stage can switch 20 mA over the full frequency response range of the device, and is compatible with both TTL and CMOS logic circuits. The device is packaged in a 4-pin plastic SIP. It is lead (Pb) free, with 100% matte tin plated leadframe. Top Features Senses motion of ring magnet or ferrous targets Integrated filter capacitor Wide operating temperature range Operation with magnetic input signal frequency from 20 Hz to 20 kHz Resistant to EMI Large effective air gaps 4.0 to 26.5 V supply operating range Output compatible with both TTL and CMOS logic families Reverse battery protection Resistant to mechanical and thermal stress Accurate true zero crossing switchpoint Typical Applications Crankshaft EXPAND ×

Description

The A1425 AC-coupled Hall-effect sensor IC is a monolithic integrated circuit that switches in response to changing differential magnetic fields created by rotating ring magnets and, when coupled with a magnet, by ferrous targets. The device is a true zero-crossing detector: the output switches precisely when the difference in magnetic field strength between the two Hall elements is zero. A unique dual-comparator scheme provides for accurate switching at the zero crossing on both the positive and negative-going regions of the differential signal, while utilizing hysteresis to prevent false switching. The zero-crossing nature of this device provides excellent repeatability and accuracy for crankshaft applications.

Changes in field strength at the device face, which are induced by a moving target, are sensed by the two integrated Hall transducers. The transducers generate signals that are differentially amplified by on-chip electronics. This differential design provides immunity to radial vibration within the operating air gap range of the A1425, by rejection of the common mode signal. Steady-state magnet and system offsets are eliminated using an on-chip differential band-pass filter. This filter also provides relative immunity to interference from electromagnetic sources.

The device utilizes advanced temperature compensation for the high-pass filter, sensitivity, and Schmitt trigger switchpoints, to guarantee optimal operation to low frequencies over a wide range of air gaps and temperatures.

Each Hall effect digital integrated circuit includes a voltage regulator, two Hall effect elements, temperature compensating circuitry, a low-level amplifier, band-pass filter, Schmitt trigger, and an output driver, which requires a pull-up resistor. The onboard regulator permits operation with supply voltages from 4.0 to 26.5 V. The output stage can switch 20 mA over the full frequency response range of the device, and is compatible with both TTL and CMOS logic circuits.

The device is packaged in a 4-pin plastic SIP. It is lead (Pb) free, with 100% matte tin plated leadframe.


Top Features

  • Senses motion of ring magnet or ferrous targets
  • Integrated filter capacitor
  • Wide operating temperature range
  • Operation with magnetic input signal frequency from 20 Hz to 20 kHz
  • Resistant to EMI
  • Large effective air gaps
  • 4.0 to 26.5 V supply operating range
  • Output compatible with both TTL and CMOS logic families
  • Reverse battery protection
  • Resistant to mechanical and thermal stress
  • Accurate true zero crossing switchpoint

Typical Applications

  • Crankshaft

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Supplier's Site Datasheet
Magnetic Sensors - Switches (Solid State) - 620-1706-ND - Digi-Key Electronics
Thief River Falls, MN, USA
Magnetic Sensors - Switches (Solid State) 620-1706-ND
MAGNETIC SWITCH SPEC PURP 4SIP

MAGNETIC SWITCH SPEC PURP 4SIP

Supplier's Site Datasheet

Technical Specifications

  Allegro MicroSystems Inc. Digi-Key Electronics
Product Category Magnetic Sensor Chips Magnetic Sensor Chips
Product Number A1425LK-T 620-1706-ND
Product Name AC Coupled Differential Geartooth Sensor Magnetic Sensors - Switches (Solid State)
Operating Temperature -40 to 150 C (-40 to 302 F) -40 to 150 C (-40 to 302 F)
Applications Automobile; Consumer; Industrial; Medical
Sensor Type Magnetic Magnetic
Package / Mounting 4-lead SIP 4-SSIP
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