The TMAG5328 is a resistor-adjustable device where the internal magnetic threshold sensitivity (B_OP) varies with the value of the external resistor connected to the “ADJ” pin of the device. When the applied magnetic flux density exceeds the B_OP threshold, the device outputs a low voltage. The output stays low until the flux density decreases to less than the release point (B_RP), then the output drives a high voltage. The B_OP 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 B_OP adjustment after assembly. As an alternative to setting the B_OP directly with a resistor, the B_OP 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 B_OP 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.

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.

This EVM includes the following features:

• Supports multiple options for setting B_OP

  • GUI-controlled DAC (requires Sensor Controller Board for initialization)

    • Sets voltage on TMAG5328 ADJ pin to create desired B_OP

    • Enables dynamically changing B_OP by changing DAC output voltage

    • Nonvolatile memory on DAC can store DAC output voltage setting to support future operation without GUI or Sensor Controller Board

  • Potentiometer

    • Sets resistance on TMAG5328 ADJ pin to create desired B_OP

    • Enables dynamically changing B_OP by adjusting potentiometer position

  • Resistor footprint for creating a static B_OP

  • External voltage supply

• LED on TMAG5328 output for visual inspection of switch’s output state

• Flexible TMAG5328 power supply options

  • 3.3-V rail from Sensor Controller Board: Enables evaluation without external power supply

  • External power supply: TMAG5328 powered independently from Sensor Controller Board, which enables testing the TMAG5328 at other voltages than 3.3 V

• 3D-printed magnetic attachment included in kit for facilitating magnetic testing