TIDUBY9 December   2021

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  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 Support Resources
    5. 4.5 Trademarks

3.1.2 Test Points and LEDs

Table 3-1 LEDs
LED PURPOSE
D1 This LED is connected to the output of U1. The LED is turned ON when the output is asserted low and turned OFF when the output is asserted high.
D2 This LED is connected to the output of U2. The LED is turned ON when the output is asserted low and turned OFF when the output is asserted high.
D3 This LED is connected to the output of U3. The LED is turned ON when the output is asserted low and turned OFF when the output is asserted high. If U3 detects an external magnetic field, this LED is turned ON.
D4 This LED is connected to the output of U4. The LED is turned ON when the output is asserted low and turned OFF when the output is asserted high. If U4 detects an external magnetic field, this LED is turned ON.
D5 (labeled LPWR on board) This LED is connected to the VCC pin of the DRV5056 and provides info if the system is in sleep or active mode. The system is only in active mode if LEDs D1 and D2 are ON while LEDs D3 and D4 are OFF.
D6 (labeled TRIG on board) This LED changes its brightness based on how far the trigger is pressed. The further the trigger is pressed, the brighter this LED.
Table 3-2 Test Points
DESIGNATOR BOARD LABEL PURPOSE

TP1

VCC

Main power supply of the board. This is either connected to the TPS709 output or the positive terminal of the battery placed in the battery holder.

TP2, TP3, TP4, TP13

GND

Board GND

TP5

SW1

Output of switch U1

TP6

SW2

Output of switch U2

TP7

VCC_2

VCC pin of DRV5056. When the trigger is not pressed, this is disconnected from VCC (test point TP1) on the board. When the trigger is pressed, VCC_2 is connected to VCC through the TPS22917 load switch.

TP8

LIN

Output of DRV5056

TP9

AMP

Output of TLV9061, which drives the cathode of the TRIG (L6) LED so that it changes its brightness based on how far the trigger is pressed.

TP10

DIV

If R10 and R11 are used to divide the output voltage from the DRV5056, this is the divided down voltage. By default, the voltage divider is not enabled. To enable it, the op-amp circuit must be disabled by removing resistor R5 from the board.

TP11

SW4

Output of switch U4

TP12

SW3

Output of switch U3

TP14

VIN

LDO input. When the board is powered from an external power supply, this test point is connected to the external 5-V to 30-V power supply so it can regulate the voltage to 3.3 V.

TP15

BV

Connected to the voltage that you want enable signal option 2 to be referenced with respect to. This can be connected to the cordless power tool battery so that enable signal is referenced with respect to the high voltage. By default, the enable signal option 2 is not available due to this circuit not being populated.

TP16

BO

Enable signal option 2. By default, the enable signal option 2 is not available due to this circuit not being populated. If the system is in active mode, the voltage here is equal to BV. If the system is in sleep mode, the voltage here is at 0 V.

TP17

LOGIC

Enable signal option 1. This is taken from the SN74HCS00 output. This is available by default. If the system is in active mode, this test point is at 0 V. If the system is in sleep mode, the voltage of this test point is set to the VCC voltage.