SBAU376A December   2021  – March 2022 TMAG5328

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Overview
    1. 1.1 Features
  5. 2Kit Contents
  6. 3Related Documentation From Texas Instruments
  7. 4Hardware
    1. 4.1 EVM Threshold Adjustment Options
      1. 4.1.1 Adjusting Threshold With DAC
      2. 4.1.2 Adjusting Threshold With Potentiometer
        1. 4.1.2.1 Using the Potentiometer to Estimate the Magnetic Flux Density Sensed by the TMAG5328
      3. 4.1.3 Adjusting Threshold With Fixed Resistor
    2. 4.2 Power Supply Options and Jumper Settings
  8. 5EVM Operation
    1. 5.1 Evaluation With SCB and GUI
      1. 5.1.1 Driver Installation
      2. 5.1.2 Firmware
        1. 5.1.2.1 Updating Firmware on SCB
      3. 5.1.3 GUI Setup and Usage
        1. 5.1.3.1 Initial Setup
        2. 5.1.3.2 GUI Operation
          1. 5.1.3.2.1 GUI Results Page
          2. 5.1.3.2.2 GUI DAC Configuration Page
      4. 5.1.4 Direct EVM Serial Communication
    2. 5.2 Evaluation Without SCB and GUI (EVM Stand-Alone Mode)
    3. 5.3 Head-On Linear Displacement Demo
  9. 6Schematics, PCB Layout, and Bill of Materials
    1. 6.1 Schematics
    2. 6.2 PCB Layout
    3. 6.3 Bill of Materials
  10. 7Revision History

4.2 Power Supply Options and Jumper Settings

The TMAG5328 in this EVM can be powered from either the main power rail on the board, which is labeled as VCC on the board, or can be powered from an external power supply that is independent of the main power rail of the board. To power the TMAG5328 from the VCC rail, add a jumper on pins 1 and 2 of header J2. By adding the jumper to J2, the TMAG5328 is powered from the same power supply as the DAC43701. If the SCB is connected to the TMAG5328EVM, then the SCB provides 3.3V on VCC, so an external power supply must not be connected to VCC in this scenario. If the SCB is not connected to the TMAG5328EVM, however, then VCC can be connected to an external power supply by connecting the external power supply between the VCC and GND test points. In this scenario, the external power supply voltage must be set to somewhere within 1.8V to 5.5V, which is within the normal power supply voltage range of both the DAC43701 and TMAG5328.

To power the TMAG5328 from an external power supply that is independent of the board's main power rail, remove the jumper on J2 and connect J4 Pin 1 (labeled TVCC on the board) to the positive terminal of a power supply and then connect the ground of the board to the negative terminal of the power supply. This configuration enables powering the TMAG5328 from a different power supply than the DAC and the SCB. The TMAG5328 power supply voltage must be set to be within 1.65V to 5.5V, which is the normal power supply voltage range of the TMAG5328.

Various jumper headers and jumper settings are present to add to the flexibility to the board. Some of these headers require that jumpers be placed appropriately for the board to correctly function. Table 4-1 shows the functionality of each header on the board.

Table 4-1 Header Names and Jumper Settings

Header Name

Type

Main Functionality

Valid Use-Cases

J1

2 x 6 pin header

Connection to SCB

To connect the TMAG5328EVM to the SCB, connect this male header to the female J1 header on the SCB. The pin mappings on this header include the following (even pins are on the top row and odd pins are on the bottom row):

  • Pin 4: GND

  • Pin 6: VCC (3.3V provided by SCB)

  • Pin 9: TMAG5328 Output

  • Pin 10: DAC43701 SCL I2C communication signal

  • Pin 11: Not used

  • Pin 12: DAC43701 SDA I2C communication signal

J2

2-pin jumper header

PWR: TMAG5328 power select

  • Place a jumper here to power the TMAG5328's power rail, which is labeled on the EVM as TVCC, to the VCC rail on the board.

  • If the user needs to power the TMAG5328 from an external power supply that is independent of the DAC and SCB, then remove the jumper here and connect the external power supply between J4 Pin 1 and GND. This option allows testing the TMAG5328 at voltages other than the 3.3V provided by the SCB.

J3

3-pin jumper header

Threshold Adjustment Option Selection

  • Place a jumper between the "ADJ" (pin 2) and "DAC" (pin 1) positions to use the DAC to set the BOP . Make sure that resistor R7 is not populated. See Section 4.1.1 for more details.

  • Place a jumper between the "ADJ" (pin 2) and "APOT" (pin 3) positions to use the potentiometer to set the BOP . Make sure that resistor R7 is not populated. See Section 4.1.2 for more details.

  • To set the BOP using a fixed resistor, remove the jumper on this pin so that no jumper is populated. Add a resistor to R7 based on the desired BOP. This resistor should be between 2 kΩ to 15kΩ See Section 4.1.3 for more details.
  • To set the BOP using an external voltage source, remove the jumper on this pin so that no jumper is populated and also make sure that resistor R7 is not populated. The external power supply must be connected between the "ADJ" (pin 2) pin and GND. The applied voltage must be between 0.16V to 1.2V. In addition, the voltage source must be able to sink 80μA of current within 4μs for proper operation.

J4

3-pin header

Probe here for TVCC and GND.

 Probe here for TVCC (pin 1) and GND (pin 3). If a jumper is pressed on J2, TVCC is connected to VCC on the board. To power the TMAG5328 from an external power supply that is independent of VCC, remove the jumper header on J2 and connect the external bench power supply between TVCC and GND.