Site Map • Contact Us
中文 • English

High-Performance Power ICs and Hall-Effect Sensors

• Search Allegromicro.com:
  
• Home
• Products
  • • Hall-Effect Sensors
    • Power ICs
    • Power Management
    • Sanken
  • Applications
    • Automotive
    • LED Lighting and Displays
    • Office Automation
    • Portable
  • Part Numbers
  • Design Center
  • Packaging
  • Store
• Corporate
  • About Us
  • Contact Us
  • Environment
  • Facilities
  • Jobs
  • Legal
    • Terms and Conditions
      of Sale
  • Press Room
  • Quality
• Sales
  • Americas
  • Europe
  • Asia Pacific
  • Japan
• Site Map
• Feedback

Related Links:

Datasheets:
A3422: Hall-Effect Direction Detection Sensor (PDF)

Selection Guides:
Hall-Effect Sensors,

Dual Element Speed and Direction Sensors for Ring Magnets

when this product is updated

Technical Publications:
Innovation In Applications-Specific Hall-Effect Transducers Merges Direction-Detection Sensing with Velocity Signals (PDF),

Ring Magnet Speed Sensing for Electronic Power Steering

FAQs:
Digital Hall-Effect Sensors FAQ

A3422
Hall-Effect Direction Detection Sensor

Features

• Internal Direction-Decoding Circuitry
• Two Matched Hall Latches On A Single Substrate
• Superior Temperature Stability
• 4.5 V to 18 V Operation
• Electrically Defined Power-On State
• Under-Voltage Lockout

Description

The A3422xKA Hall-effect, direction-detection sensor is a new generation of special function integrated sensors that are capable of sensing the direction of rotation of a ring magnet. These transducers provide separate digital outputs that provide information on magnet rotation speed, direction, and magnet pole count. These devices eliminate the major manufacturing hurdles encountered in fine-pitch direction-detection applications, namely maintaining accurate mechanical location between the two active Hall elements. Here, the two Hall elements are photolithographically aligned to better than 1 µm, as contrasted with 100 µm or worse mechanical location tolerance when manufactured discretely. These highly sensitive, temperature-stable, magnetic transducers are ideal for use in digital-encoder systems in the harsh environments of automotive or industrial applications. The A3422xKA is a high-sensitivity device optimized for use with high-density magnets.

The A3422xKA monolithic integrated circuit contains two independent Hall-effect latches whose digital outputs are internally coupled to CMOS logic circuitry that decodes signal speed and direction. Extremely low-drift BiCMOS circuitry is used for the amplifiers to ensure symmetry between the two latches so that signal quadrature can be maintained. An on-chip voltage regulator allows the use of these devices from a 4.5 V to 18 V supply. This device has standard open-collector outputs.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3422EKA	5-pin SIP	No	view data	-40 °C to  85 °C	discontinued	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.
A3422EKA-T	5-pin SIP	Yes	view data	-40 °C to  85 °C	not for new design	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.
A3422LKA	5-pin SIP	No	view data	-40 °C to  150 °C	discontinued	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.
A3422LKA-T	5-pin SIP	Yes	view data	-40 °C to  150 °C	not for new design	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.

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.