A1468: Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration

Description

The A1468 is an optimized Hall effect sensing IC that provides a user-friendly solution for digital ring-magnet sensing, or when coupled with a magnet, ferromagnetic target sensing, in three-wire applications. The small device package can be assembled simply into applications for use in conjunction with a wide variety of target shapes and sizes.

The integrated circuit incorporates dual Hall effect elements with a 2.2 mm spacing 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 airgap-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 provides immunity to environmental effects such as micro-oscillations of the target or sudden air gap changes.

The device is ideally suited to obtaining speed and duty cycle information in ring-magnet–based speed, position, and timing applications, such as in speedometers.

The A1468 is available in a 4-pin SIP (suffix K). The package is lead (Pb) free, with 100% matte tin leadframe plating.

Top Features

  • 4.0 to 26.5 V supply operating range
  • Minimum differential field 20 Gpk-pk
  • Running mode calibration for continuous optimization
  • Single chip IC for high reliability
  • Precise duty cycle signal throughout 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
  • Reverse battery protection
  • Scan and IDDQ for increased test coverage

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A1468LK-T 4-lead SIP -40°C to 150°C -- View Data Contact your
local sales rep
Check
Distributor Stock
A1468LKTN-T 4-lead SIP -40°C to 150°C -- View Data Contact your
local sales rep
Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

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