Analog Pointing Devices

  • Inquiry

Recently, there has been a growing demand for an input device that offers high operability to match advances in the functions and multi−functions of electronic equipment. "Highly operable input device" refers to the kind of device that can emulate certain human senses, i.e., an input device that has an analog output. Here, we introduce analog pointing devices (hereinafter called APDs) that use Hall sensors, to enable free movement of the cursor on screens for portable device, etc.

The magnetic field produced by a magnet that is integrated with the moving element is detected by four Hall elements, and the position of the magnet is computed from the difference in magnetic flux density detected in two dimention. The APD's product family comprises the Hall sensors incuding cotrol IC with serial interface as well as the Hall sensors with analog interface in tune with design. The product catalog is here.

Part# Data
Sheet
Automotive
qualified
Oper.
Temp.
Power
Supply
Package
V
   
EQ0442-30 to 852.5 to 3.320-QFN

  1. APD using Hall sensor                                

  Advantages of using Hall sensors in APDs
        1. Analog output of displacement of the input key and high operability can be obtained.
        2. Small, thin construction of the control element can be achieved.
        3. Durability is improved due to the non−contact detection process.
        4. Because magnetism is detected, the device is more resistant to tiny particles of dirt, dust, or oil.

 2. Principle                                      

  The magnetic field produced by a magnet that is integrated with the moving element is detected

  by four Hall elements, and the position of the magnet is computed from the difference in magnetic

  flux density detected in two dimensions.

 

 3. Example of composition                                                                                            

 Here are two typical examples of composition of APDs using Hall sensors.

    ■ Composition-1
   This example comprises a Hall effect IC integrating four Hall elements and a control IC

   in one package and the magnet. Four Hall elements can be installed without risk of misalignment

   because they are embedded in one package.


    ■ Composition-2

   This example consists of four Hall elements that detect magnetic fields on a plane (X and Y coordinates),

   a control IC, and a one−ring magnet magnetized in the radial direction.
   By increasing the degree of freedom in the arrangement of the four Hall elements and the control IC

   the mechanism can be made thinner.

 

 4. Recommended poroducts for application            

We can supply the following products for use in constructing APDs:

                                   Built−in control IC type: EQ-0442
                                   Hall element type:
HQ−8220, HQ−0111

Under construction

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