Advanced Magnetic Sensors

Honeywell's APS00B High Resolution Magnetic Displacement Sensor is a miniature surface mount sensor for linear, angular, or rotary displacement designed for magnetic saturating field sensing.

The APS00B creates an analog output voltage that varies with the direction of the magnetic flux passing over the sensor surface. It contains dual, saturated-mode Wheatstone bridges that generate quadrature (sine and cosine) signals to provide an extended range of angular measurements up to 180º.

This APS00B sensor is a cost-effective and space-efficient solution for high-volume OEM designs. Potential applications include position sensing, rotary speed and angle detection, and non-contact precision location measurement systems.

APS00B sensors use Honeywell's Anisotropic Magnetoresistive (AMR) technology that provides advantages over Hall-effect-based magnetic sensors. They are designed to resolve better than a tenth of a degree or a tenth of a millimeter, to withstand large variations in magnet-to-sensor gaps, and to exhibit insensitivity to shocks and vibrations. Honeywell's magnetic sensors are among the most precise and reliable position sensors in the industry.

These surface mount devices are mounted directly on the electrical traces on a PC (Printed Circuit) board. They are attached by an automatic solder reflow operation which requires no hole, so it may help reduce the cost of the PC board.

APS00B Datasheet

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• Wide, angular range allows measurements of ±90º without additional components, making this device suitable for a variety of angular sensing applications. Measurements of ±180º are possible with external components.
• Resolution capability of less than 0.05º enhances overall system accuracy.
• Absolute sensing means no indexing is required and the exact target position is known, which can simplify the system design.
• Dual Wheatstone bridges provide a passive, low-noise design, enhancing system performance.
• Small, 8-pin surface-mount package saves room on the PC board when compared to larger IC (Integrated Circuit) packages and components.
• RoHS-compliant materials meet Directive 2002/95/EC.

• Tape and reel configuration allows use with automated pick-and-place equipment, potentially reducing assembly costs (178mm [7in] and 330mm [13in] reels available).
• Typical 0MHz to 5MHz frequency response with 190G minimum magnetic field applied makes this saturated mode sensor potentially suitable for high speed applications.
• Typically requires only 5V at 4mA to operate (20mW), promoting energy efficiency.
• The sensors measure only field direction and are virtually unaffected by shock, vibration and magnetic-source gap variations, providing a stable, reliable output.
• Dual bridges with outputs 45º out of phase make it possible to use outputs as speed and direction signals.
• Honeywell APS00A instrumentation amplifier is available separately for additional signal processing.

• High accuracy angular position sensing
• Rotary speed and angle detection
• Non-contact precision displacement sensing
• Speed and direction sensing
  

• High accuracy position sensing
• Rotary speed and angle detection
• Non-contact precision displacement sensing
• Valve position
• Robotics control
  

• High accuracy position sensing
• Rotary speed and angle detection
• Non-contact precision displacement sensing
  

Honeywell's VF401 is a high performance, digital, 2-wire, MR (magnetoresistive) sensor in a miniature, flat, TO-92-style, plastic package with a current output, designed for sensing fine pitch ring magnets.

The unique VF401 bridge array (patent number 6,297,628) has been optimized to allow a greater air gap between the target and the sensor with reduced loss in sensor signal or accuracy.

VF401 Datasheet

The VF401 has a reduced sensitivity to run-out (shift in sensor position relative to the inside or outside diameter of the ring magnet). It is also less sensitive to tilt tolerance (deviation from parallel positioning of the sensing elements and ring magnet), accepting up to 10º, versus only 2º to 3º for typical ring magnet sensors, as well as being less sensitive to twist (deviation of perfect angular position of the bridge runners relative to the pole transitions).

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• Robust design operating from -40ºC to 150ºC [-40ºF to 302ºF] can withstand short durations up to 175ºC [347ºF], allowing use in potential applications with extreme temperature requirements.
• Not damaged by reverse polarity voltages when customer-supplied sense resistor is installed, enhancing protection.
• Patented MR bridge optimized for stable sensing of 20- to 50-pole pair ring magnets with improved insensitivity to run-out, tilt, and twist.
• 2-wire digital current output simplifies wiring and interfacing which can reduce total system cost.
• Enhanced sensitivity, ±7 Gauss typical, allows for larger air gaps (up to 2.5mm [0.098in]) and higher pole density (up to 50-pole pairs depending on ring diameter).
• One pulse per pole pair output and differential bridge operation allow compatibility with differential Hall sensors which can make it easier to upgrade existing applications.
• Wide speed capability provides application flexibility with true zero speed sensing and operation up to 3000Hz.
• Output pattern independent of gap between target and sensor.
• RoHS-compliant materials meet Directive 2002/95/EC.

• Speed encoding using a multipole ring magnet
• Enhanced accuracy rotational position sensing
• Wheel speed sensing
• Window lift applications
• Speed and direction sensing

• Shaft speed encoding using a multipole ring magnet
• Enhanced accuracy rotational position sensing
• Precision motor speed measurement
• Speed control in machine tools
• Elevator speed sensing
• Speed control in motorized industrial equipment

• Shaft speed encoding using a multipole ring magnet
  

Honeywell's VF526DT Bipolar Latch, Dual Hall-effect Digital Position Sensor has two distinct Hall sensing elements precisely located 1.4mm [0.055in] apart on a single integrated circuit chip. The elements are encapsulated in a thermoset molding material.

The two active Hall latches provide speed and direction indication of a magnetic gradient (such as a rotating ring magnet) across the face of the package.

The miniature, 4-pin SOT-89B package surface mounts on PC (Printed Circuit) boards and flexible circuits.

VF526DT Datasheet

The VF526DT's built-in temperature compensation is designed to match the temperature coefficient of low-cost magnets, allowing for a reliable, yet cost-effective, sensor-magnet combination.

A unique, regulator circuit provides extremely stable operation with supply voltages from 3.4Vdc to 24Vdc. It can directly interface with many electronic components without buffering or compensation circuitry.

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• Temperature-compensated magnetics and ultra-low offset drift with temperature provides a stable output over a full temperature range of -40ºC to 125ºC [-40ºF to 257ºF].
• Single, miniature 4-pin SOT-89B plastic package supplied on tape and reel for automated assembly, allowing potential savings in PC board space and labor cost.
• Two separate built-in Hall sensors and their associated logic circuitry provide a frequency signal for speed output and a logic level (high or low) signal for direction output, potentially replacing multiple sensors and electronic components.
• Wide operating voltage range of 3.4Vdc to 24Vdc increases application flexibility.
• Tested to moisture sensitivity similar to JEDEC J-STD-020B, MSL Level 1, allowing the VF526DT to be used in environments where humidity may be a problem.
• RoHS-compliant materials meet Directive 2002/95/EC.

• Anti-pinch electric motor control systems for:
• Power windows
• Power seats (headrest)
• Power sliding doors
• Sunroofs
• Magnetic encoding for electronic steering systems

• Motion control systems for pulleys and belts
• Garage door openers and sliding doors
• Position and velocity detection in industrial equipment
• Linear displacement sensing (using a magnetic strip of alternating poles)