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

1 Overview

The TMAG5328 is a resistor-adjustable device where the internal magnetic threshold sensitivity (BOP) varies with the value of the external resistor connected to the “ADJ” pin of the device. When the applied magnetic flux density exceeds the BOP threshold, the device outputs a low voltage. The output stays low until the flux density decreases to less than the release point (BRP), then the output drives a high voltage. The BOP is selectable to be anywhere between the 2-mT to 15-mT range. This device allows designing a platform of systems with multiple sensitives with only one Hall sensor, thereby reducing device inventory management and facilitating prototyping by enabling BOP adjustment after assembly. As an alternative to setting the BOP directly with a resistor, the BOP can also be set by directly applying a voltage on the ADJ pin, assuming that the voltage source can properly sink the current generated internally on the ADJ pin.

The TMAG5328EVM is an easy-to-use platform for evaluating the performance of the TMAG5328. This EVM supports adjusting the BOP using four options: a fixed resistor, a potentiometer for creating an adjustable resistance, the DAC43701 DAC for creating an adjustable voltage, or an external voltage source. Figure 1-1 shows the EVM. The Sensor Controller Board (SCB) interfaces the EVM to the PC GUI. Note that the SCB is sold separately from the TMAG5328EVM.

GUID-20211108-SS0I-QRHL-X5GB-ZLLQHGG1CH73-low.png Figure 1-1 TMAG5328 Evaluation Module

The EVM is intended to provide basic functional evaluation of the devices. The layout is not intended to be a model for the target circuit, nor laid out for electromagnetic compatibility (EMC) testing.