JAJU835 December   2021

 

  1.   概要
  2.   リソース
  3.   特長
  4.   アプリケーション
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
      1.      10
    2. 2.2 Highlighted Products
      1. 2.2.1 DRV5056
      2. 2.2.2 DRV5032
      3. 2.2.3 TPS709
      4. 2.2.4 SN74HCS00
      5. 2.2.5 TPS22917
      6. 2.2.6 SN74AUP1G00
      7. 2.2.7 TLV9061
    3. 2.3 Design Considerations
      1. 2.3.1 Design Hardware Implementation
        1. 2.3.1.1 Hall-Effect Switches
          1. 2.3.1.1.1 U1 Wake-Up Sensor Configuration
          2. 2.3.1.1.2 U2 Stray-Field Sensor Configuration
          3. 2.3.1.1.3 U3 and U4 Tamper Sensor Configuration
          4. 2.3.1.1.4 Hall Switch Placement
            1. 2.3.1.1.4.1 Placement of U1 and U2 Sensors
              1. 2.3.1.1.4.1.1 U1 and U2 Magnetic Flux Density Estimation Results
            2. 2.3.1.1.4.2 Placement of U3 and U4 Hall Switches
              1. 2.3.1.1.4.2.1 U3 and U4 Magnetic Flux Density Estimation Results
          5. 2.3.1.1.5 Using Logic Gates to Combine Outputs from Hall-Effect Switches
        2. 2.3.1.2 Linear Hall-Effect Sensor Output
          1. 2.3.1.2.1 DRV5056 Power
          2. 2.3.1.2.2 DRV5056 Output Voltage
          3. 2.3.1.2.3 DRV5056 Placement
        3. 2.3.1.3 Power Supply
        4. 2.3.1.4 Transistor Circuit for Creating High-Voltage Enable Signal
      2. 2.3.2 Alternative Implementations
        1. 2.3.2.1 Replacing 20-Hz Tamper Switches With 5-Hz Tamper Switches
        2. 2.3.2.2 Using Shielding to Replace Tamper Switches and Stray Field Switch
        3. 2.3.2.3 Replacing Hall-Based Wake-Up Alert Function With a Mechanical Switch
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Installation and Demonstration Instructions
      2. 3.1.2 Test Points and LEDs
      3. 3.1.3 Configuration Options
        1. 3.1.3.1 Disabling Hall-Effect Switches
        2. 3.1.3.2 Configuring Hardware for Standalone Mode or Connection to External Systems
    2. 3.2 Test Setup
      1. 3.2.1 Output Voltage Accuracy Testing
      2. 3.2.2 Magnetic Tampering Testing
      3. 3.2.3 Current Consumption Testing
    3. 3.3 Test Results
      1. 3.3.1 Output Voltage Accuracy Pre-Calibration Results
      2. 3.3.2 Output Voltage Accuracy Post-Calibration Results
      3. 3.3.3 Magnetic Tampering Results
      4. 3.3.4 Current Consumption Results
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 サポート・リソース
    5. 4.5 Trademarks

3.1.1 Installation and Demonstration Instructions

This hardware comes with an empty battery holder that is placed inside the 3D printed trigger module. Figure 3-1 shows the 3D model of the trigger module (note that the spring and the battery holder wires are not shown in the image).

GUID-20211214-SS0I-KFJC-KGSS-XCLSZJ5ZPDNN-low.png Figure 3-1 Front View With Battery Holder Inside Trigger Module

To use this design, batteries must be placed inside the battery holder. Batteries can be installed by first pushing the battery clip upwards and simultaneously taking the battery holder outside of the trigger module. Figure 3-2 shows a 3D model with the battery holder placed outside the trigger module. After the battery holder is outside the trigger module, install the two AAA batteries into the battery holder. Finally, the battery holder should be placed back into the trigger module by pressing the clip upwards while placing the battery holder back into the trigger module until the battery holder is inside the trigger module again (see Figure 3-1).

GUID-20211214-SS0I-KQ2Z-HXH9-TLD5J0BRNMWS-low.png Figure 3-2 Front View With Battery Holder Outside Trigger Module

The design can be used in standalone mode by pressing the trigger in Figure 3-1 to the left and observing the state of the LEDs on the board. When the trigger displacement reaches a certain distance threshold, the system is awakened from sleep mode. LEDs D1, D2, and LPWR will be ON when the system is in active mode and LEDs D3 and D4 will be OFF. In addition, the TRIG LED will change its brightness based on how far the trigger is pressed. The further the trigger is pressed, the brighter the TRIG LED will appear. Note that the trigger cannot be pressed to reach a full displacement distance of 10 mm due to the spring preventing the trigger from being fully pressed.

If an external magnetic field is detected by switch U3, LED U3 will be on and the system will be placed in sleep mode. Similarly, if an external magnetic field is detected by switch U4, LED U4 will be turned ON and the system will also be placed in sleep mode. As an alternative to viewing the state of the LED, the outputs of the different Hall sensors can also be observed by measuring the output voltage at the corresponding test points on the board. Section 3.1.2 provides more details on the test points and LEDs available on this board.