ALPS ALPINE HGDEPM013A Magnetic Sensor Instructions
- September 19, 2024
- ALPS ALPINE
Table of Contents
HGDEPM013A Magnetic Sensor
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Product Information
Specifications
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Product Name: Magnetic Sensor HGDE/HGDF Series (Dual polarity /
Single output) -
Models: HGDEPM013A, HGDEPT021B, HGDFPT021B
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Switching Output Type
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Document No: 830N0078-O May 2024 Rev1.0
Product Usage Instructions
1. Overview
The Magnetic Sensor HGDE/HGDF Series is designed for dual
polarity with a single output. Fig.1 illustrates the sensing
direction for the magnetic switch operation. Refer to Table.1 for
Magnetic Flux Density (MFD) values.
2. Sensor Layout
This section provides guidance on designing the magnetic switch
layout. Consider the movement of the specified type of magnet in
the vertical direction with respect to the magnetic switch. Ensure
stable operation by meeting the target MFD values for ON and OFF
states. Refer to Table 2 for different product specifications.
3. Selection of Magnets
Various shapes of magnets are suitable for use with the magnetic
switch. Fig.5 displays examples of magnets that can be utilized.
Select a magnet that meets the target MFD values and ensures stable
ON/OFF operation within the specified range.
4. Circuit Design
Refer to Fig.6 for a sample circuit design for the magnetic
switch. Incorporate a current limiting resistor at the OUT terminal
as needed to optimize performance.
FAQ
Q: How do I ensure stable operation of the magnetic
switch?
A: Select a magnet that meets the target MFD values with a
reserve margin and stays within the specified distance range from
the magnetic sensor for both ON and OFF states.
Q: Can I use different types of magnets with this sensor?
A: Yes, various shapes of magnets are available in the market
that can be used with the magnetic switch. Ensure the selected
magnet provides stable operation within the designated range.
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Magnetic Sensor HGDE/HGDF Series (Dual polarity / Single output) Design Guide
Magnetic Sensor Switching Output Type
HGDE/HGDF Series (Dual polarity / Single output)
Design Guide
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Document No: 830N0078-O May 2024 Rev1.0
Magnetic Sensor HGDE/HGDF Series (Dual polarity / Single output) Design Guide
Table of Contents
1. Overview …………………………………………………………………………………………………………………………….. 3 2. Sensor
layout ……………………………………………………………………………………………………………………….. 4 3. Selection of
magnets………………………………………………………………………………………………………………. 5 4. Circuit
design……………………………………………………………………………………………………………………….. 5 5. General precautions
………………………………………………………………………………………………………………. 6 6.
Disclaimer……………………………………………………………………………………………………………………………. 7
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Magnetic Sensor HGDE/HGDF Series (Dual polarity / Single output) Design Guide
Switching Output Type HGDE/HGDF Series (Dual polarity / Single output)
HGDEPM013A, HGDEPT021B, HGDFPT021B
Alps Alpine high-precision magnetic sensors use Giant Magneto Resistive effect
(GMR) for horizontal magnetic fields detection. Utilizing the GMR element for
its high output and exceptional resistance to high temperatures and magnetic
fields, our sensors achieve high output level and sensitivity compared to
other xMR sensors; approximately 100 times higher than Hall element and 10
times higher than AMR element based on our research. We offer various magnetic
sensors for dedicated usage such as non-contact switch applications, linear
position detection and angle detection as well as rotational speed and
direction sensing in response to external magnetic fields. This document
provides essential information for understanding and implementing switching
output type magnetic sensor Dual polarity / Single output (herein after
magnetic switch) in your design.
1. Overview
Magnetic switch detects changes in magnetic field strength (flux density) and
output ON/OFF signals accordingly. Magnetic switch (Dual polarity / Single
output) detects any direction of horizontal magnetic field in wide area. Fig.1
shows horizontal direction of magnetic field density (MFD) in operating mode.
As the example HGDEPM013A is on (output LOW) at 1.3mT(typ.) and off (output
HIGH) at 0.8mT(typ.). Table 1 shows the specification of magnetic flux density
(MFD) when the magnetic switch is operated.
Fig.1 Sensing direction for magnetic switch Table.1 MFD for magnetic switch
operation
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Magnetic Sensor HGDE/HGDF Series (Dual polarity / Single output) Design Guide
Fig.2 and Fig.3 show an example of MFD when the magnet is brought close to the
magnetic sensor. Fig.2 shows the variation of the MFD with respect to the
movement of the magnet in the vertical direction of the magnetic sensor. Fig.3
shows the variation of the MFD with respect to the movement of the magnet in
the horizontal direction of the magnetic sensor.
Fig.2 MFD vs vertical magnet movement
Fig.3 MFD vs horizontal magnet movement
2. Sensor layout
This section gives an example of magnetic switch design when a specified type of magnet moves in the vertical
direction with respect to the magnetic switch (HGDEP013A). For designing with other products such as
HGDEPT021B and HGDFPT021B, please refer to Table 2.
Conditions
Magnet: NdFeB
Magnet size: 4×3×1mm 4mm (long direction) magnetized.
Movement: Up and down of the magnet relative to the magnetic sensor.
Target value of magnetic flux density (MFD) when magnetic switch is ON or OFF
Consideration of the hysteresis is required for stable operation.
MFD at ON: 2.4mT or more … reserve 20% margin to maximum ON MFD (2.0mT).
MFD at OFF: 0.24mT or less … reserve 20% margin to minimum OFF MFD (0.3mT).
Magnet position
ON: Within 7mm from the magnetic sensor. OFF: 16mm or more from the magnetic sensor.
16mm
The position of each related part is shown in Fig. 4.
7mm
Table.2 Target value of MFD to distance
Magnetic switch Fig.4 Magnet position
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Magnetic Sensor HGDE/HGDF Series (Dual polarity / Single output) Design Guide
The range in which the magnet can move is generally limited by the actual
structural design, and it is necessary to select a magnet that ensures stable
ON/OFF operation of the magnetic switch within this limited range. So, it is
also possible to reverse the design accordingly. For instance, set the target
for magnetic flux density and then discuss the selection of an appropriate
magnet with the magnet manufacturer.
3. Selection of magnets
Various shapes of magnets are available in the market. Fig.5 shows examples of
the magnet which can be used for magnetic switch.
Fig.5 Examples of magnet
4. Circuit design
Fig.6 shows reference circuit for magnetic switch. Fig.6 shows reference
circuit for magnetic switch. Please add current limiting resistor at OUT
terminal depend on necessity.
Fig.6 Reference circuit for magnetic switch Table.3 Example of parameters
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Magnetic Sensor HGDE/HGDF Series (Dual polarity / Single output) Design Guide
5. General precautions
The following are general precautions for using magnetic sensors and magnets.
Selecting the appropriate magnet Select the type and strength of the magnet in
accordance with the specification of the magnetic sensor and the requirements
of the application scenario. Excessive strength of the magnet may cause the
sensor to malfunction. Thermal environment Magnets are sensitive to
temperature and the strength of the magnetic field varies with temperature.
When the magnetic sensor and magnet are heated, the stability of the magnetic
field may be affected. Therefore, it is necessary to investigate appropriate
thermal countermeasures. Influence of Magnet Configuration and Surrounding
Magnetic Materials Magnetic sensors are affected by surrounding magnetic
materials (e.g. magnets, iron). Check whether the interference of the magnetic
field affects the operating performance of the magnetic sensor and take care
to adjust the magnet, the surrounding magnetic material, and the sensor to the
appropriate positional relationship. Static electricity Magnetic sensors are
semiconductor devices. They can be damaged by static electricity that exceeds
the capacity of the specified electrostatic protection circuit. Take adequate
measures to protect against static electricity during use. EMC Magnetic
sensors may be damaged or malfunction due to over-voltage of the power supply
in an automobile environment, exposure to radio waves, and so on. Implement
protection measures (Zener diodes, capacitors, resistors, inductors, etc.) as
necessary.
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Document No: 830N0078-O May 2024 Rev1.0
Magnetic Sensor HGDE/HGDF Series (Dual polarity / Single output) Design Guide
6. Disclaimer
1. The contents of this document are subject to change without prior notice.
2. Reproduction or copying of part or all of this document is strictly
prohibited without the permission of
the Company. 3. The information in this document, such as software and circuit
examples, is example for the standard
operation and use of this product. When used in actual design, customers are
requested to take responsibility for the products and designs their product.
We are not responsible for any damage caused using these. 4. The Company makes
no warranty and assumes no responsibility for infringement of third-party
patents, copyrights, and other intellectual property rights or disputes
related thereto arising from the use of product data, diagrams, tables,
programs, circuit examples, and other information described in this document.
5. When exporting products that are subject to domestic or overseas export-
related regulations, please obtain the necessary licenses, procedures, etc.,
based on compliance with such regulations. 6. If you have any questions about
the contents or products described in this document, please consult our sales
department.
Inquiries about products and services For inquiries about our products and
services, please visit the inquiry window on our website.
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Document No: 830N0078-O May 2024 Rev1.0
Magnetic Sensor HGDE/HGDF Series (Dual polarity / Single output) Design Guide
Revision history
Date May. 24 2024
Version 1.0
Change Initial release (English version)
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Document No: 830N0078-O May 2024 Rev1.0