ALPS ALPINE HGDE,HGDF Series Magnetic Sensor Switching Output Type
Specifications:
- Product Name: Magnetic Sensor HGDE/HGDF Series (Single polarity/ Single output)
- Models: HGDESM013A, HGDESM023A, HGDESM033A, HGDEST021B,HGDFST021B
Product Overview:
The magnetic switch detects changes in magnetic field strength (flux density) and outputs ON/OFF signals accordingly. It detects a certain direction of horizontal magnetic field (+H).
Table 1: MFD for magnetic switch
Sensor Layout:
This section provides an example of magnetic switch design when a specified type of magnet moves in the vertical direction with respect to the magnetic switch (HGDESM013A).
Conditions:
- Magnet: NdFeB
- Movement: Up and down of the magnet relative to the magnetic sensor.
- Target value of MFD when magnetic switch is ON or OFF:
- 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
Figure 4: Magnet position
Usage Instructions:
- Select a magnet that ensures stable ON/OFF operation within the limited range.
- Consider hysteresis for stable operation.
- Follow the provided target values for MFD when determining magnet selection.
- Ensure proper magnet positioning within the specified distances for ON and OFF states.
Switching Output Type HGDE/HGDF Series (Single polarity / Single output)
HGDESM013A, HGDESM023A, HGDESM033A, HGDEST021B, HGDFST021B
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 Single polarity / Single output (herein after magnetic switch) in your design.
Overview
Magnetic switch detects changes in magnetic field strength (flux density) and output ON/OFF signals accordingly.
Magnetic switch (Single polarity / Single output) detects a certain direction of horizontal magnetic field (+H) as shown in Fig.1. For instance, HGDESM013A 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.
Table.1 MFD for magnetic switch
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.
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 (HGDESM013A). For designing with other products, please refer to Table 2.
Conditions
- Magnet: NdFeB
- Movement: Up and down of the magnet relative to the magnetic sensor.
- Magnet size: 4×3×1mm 4mm (long direction) magnetized.
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. The position of each related part is shown in Fig. 4.
Magnet direction
This product distinguishes direction of MFD. Please care about magnet direction.
Table.2 Target value of MFD to distance
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.
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.
Circuit design
Fig.6 shows reference circuit for magnetic switch. Please add current limiting resistor at OUT terminal depend on necessity.
Table.3 Example of parameters
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.
Disclaimer
- The contents of this document are subject to change without prior notice.
- Reproduction or copying of part or all of this document is strictly prohibited without the permission of the Company.
- 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.
- 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.
- 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.
- If you have any questions about the contents or products described in this document, please consult our sales department.
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Revision history
| Date | Version | Change |
| May. 24, 2024 | 1.0 | Initial release (English version) |
©2024 Alps Alpine Co., Ltd. All rights reserved.
FAQ
Q: How do I ensure stable operation of the magnetic switch?
A: Select a magnet that meets the target MFD values with proper margins and position it correctly within the specified distances.
Documents / Resources
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ALPS ALPINE HGDE,HGDF Series Magnetic Sensor Switching Output Type [pdf] User Guide HGDESM013A, HGDESM023A, HGDESM033A, HGDEST021B, HGDFST021B, HGDE HGDF Series Magnetic Sensor Switching Output Type, HGDE HGDF Series, Magnetic Sensor Switching Output Type, Sensor Switching Output Type, Switching Output Type, Output Type |