Magnetoresistive Sensors

Magnetoresistive technology provides high signal clarity in an attractive cost effective package, with or without signal conditioning and it is available in two resolution packages.

Single Magnetoresistive Sensors

Precision Position Control

Digitrac® Solid-state Single Magnetoresistive sensors with digital or analog output and true zero-speed capability provide valuable output by indicating relative position within the sensing area with an incremental position output.

Its unique magnetoresistive technology provides high signal clarity in an attractive cost effective package, with or without signal conditioning and it is available in two resolution packages.

These sensors are frequently used with single magnet targets in counting, function start/stop, or orientation alignment of mechanical and electronic indexing equipment applications. Contact Sales for more details on how Digitrac can fit your most demanding application.

Applications

  • Speed detection
  • Position detection
  • Rotation detection
  • Angle encoder
  • Linear position sensing

Features

  • Sensing over wide rotation speed range
  • Robust metallic housing
  • Signal amplitude is speed independent
  • Biasing magnet built-in
  • TTL/CMOS compatible
  • Best suited for harsh environments

Single Magnetoresistive

Typical Specifications for Standard Resolution

Supply Voltage

5 Vdc

Supply Current

12 mA

Maximum Output

0.2 V low: 4.75 V high

Resolution

0.065"

Cutoff Frequency

20 kHz

Operating Temperature

-25°C to +80°C

Single Magnetoresistive

Typical Specifications for High Resolution

Supply Voltage

12 Vdc

Supply Current

25 mA

Maximum Output

0.2 V low: 4.75 V high

Resolution

0.025"

Cutoff Frequency

-25°C to +80°C

Operating Temperature

-25°C to +80°C

Housing Material/Style Non Magnetic Stainless Steel, Plastic threaded or non-threaded, Aluminum, Molded, Stamped, Brazed. More than 30 standard terminal configurations available to your specification.

Dual Magnetoresistive Sensors

Taking the Process One Step Further

Bitrac™ Solid-state Dual Magnetoresistive sensors with digitized incremental position output takes the process one step further by indicating direction of target motion.

Direction is indicated by a second distinct output with two designated dc voltages. This bidirectional output is highly accurate and updated twice per cycle.

Available in two resolution versions Bitrac eliminates costly design and assembly functions and gives reliable, maintenance free performance from a single solid state magnetic sensor.

The sensor uses magnetoresistive rather than hall-effect technology, resulting in a strong primary input with no signal (and therefore no noise) amplification prior to conditioning.

The entire system circuitry benefits from Bitrac’s initially high signal-to-noise ratio and improved digital-output clarity, contact Sales to learn more about Dual Magnetoresistive sensors or complete our online questionnaire for a fast quote.

Features

  • Sensing over wide rotation speed range
  • Robust metallic housing
  • Signal amplitude is speed independent
  • Biasing magnet built-in
  • TTL/CMOS compatible
  • Best suited for harsh environments

Applications

  • Speed detection
  • Position detection
  • Rotation detection
  • Angle encoder
  • Linear position sensing

Dual Magnetoresistive

Typical Specifications for Standard Resolution

Supply Voltage Range

10-14 Vdc

Supply Current

70 mA maximum

Directional Outputs [fan out to 10 TTL inputs max.]

0.2 Vdc or 3 Vdc

Incremental Position Output (fan out to 20 TTL inputs maximum)

0.4 Vdc low
4.75 Vdc high

Duty Cycle

50 +/-10%

Resolution

0.065"
(equivalent to #12-pitch gear)

Cutoff Frequency

20 kHz

Operating Temperature

-25°C to +80°C

Dual Magnetoresistive

Typical Specifications for High Resolution

Supply Voltage

+/- 15 Vdc

Supply Current

80 mA maximum

Directional Outputs [fan out to 10 TTL inputs max.]

0.2 Vdc or 3 Vdc

Incremental Position Output (fan out to 20 TTL inputs maximum)

0.4 Vdc low
4.75 Vdc high

Duty Cycle

50 +/-10%

Resolution

0.025"
(equivalent to #32-pitch gear)

Cutoff Frequency

20 kHz

Operating Temperature

-25°C to +80°C

Housing Material/Style Non Magnetic Stainless Steel, Plastic threaded or non-threaded, Aluminum, Molded, Stamped, Brazed. More than 30 standard terminal configurations available to your specification.

Case Study

Intelligent Solutions Superior Value

A worldwide leader in the design and manufacture of electrical control and test equipment was looking to improve both performance and cost of an encoder used to measure counter clockwise rotation and phase shift.

The existing encoder used optoelectronics with surface mount components, photodiodes and LED’s, encapsulated in a mechanical housing. It was costly to manufacture and sensitive to EMC as well as temperature, vibration, dust and water.

Our experience with higher integrated electronic technologies allowed us to develop a design focused solution that was sensitive to the application. The new sensor consisted of a two magneto resistive elements with signal conditioning in a high resolution package.

The new product had none of the technical disadvantages of its predecessor, and met performance criteria at a lower unit test and development cost.

Magnetoresistive Case Study Specifications

Supply Voltage (Vs)

+12 Vdc +/-10%

Supply Current

40 mA Typ.

Output Config.

Dual Channel Open Collector
NPN with 2K Ohm Internal Pull - Up to +Vs

Isolation

2000 Vdc Hi-Pot To Case

Output Voltage

VOH = .99(Vs) Min.
VOL= .4 Vdc Max. @ IOL=20 mA

Duty Cycle

50% +/-10%

Rise Time

5 uSEC Typ.

Fall Time

.2 uSEC Max.

Cutoff Frequency

20 KHz Max.

Target

Ferromagnetic 54 DP Gear

Examples

Magentoresistive Examples

Speed Sensor Dual Digitrac 5V Standard Resolution

Used for forklift drum brake ABS slip and traction control, the sensor signals the control unit, which controls power to the electro-mechanical brake calipers, ensuring that the pad to rotor gap is precisely maintained, reducing brake drag and improving fuel economy.

Transducer High Resolution Magnetoresistive Sensor

Used in a night vision scope with an electronic image converter that is attached to ordinary binoculars allowing them to be used at night. The sensor is used to achieve accurate motion compensation enhancing visibility.

IC Assembly Magnetoresistive Sensor

Used in advanced automation IC assembly equipment to measure placement speed of dual-drive linear motors that automatically center the PCB’s between feeder banks for optimal balancing across the beams, trusted reliability and accuracy.

Dual Band Magnetoresistive Sensor Standard Resolution

Measures the platen gap in conjunction with impact parameters to control paper movement and impact force in line matrix printers used for mission critical printing, warehouse or supply chain management applications.

Position Sensor Single Digitrac 5V Standard Resolution

Used in a fixed path Automatic Guided Vehicle System (AGVS) to determine the vehicles position over wires embedded into a floor, if the vehicle is off center, to the left or right, the AGVS makes needed course correction achieving precise vehicle location.

Magnetoresistive Displacement Sensor

Used in a cylinder stroke displacement measuring system, the sensor provides sine and cosine quadrature outputs/counting pulses that results in incremental input for a tracking phase resolver, functional and reliable under all environmental conditions.

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