Hardware requirements

  • Micro USB cable

  • MIMXRT685-AUD-EVK board

  • Personal Computer

Board settings

This example project uses ACMP to compare the voltage signal input from External Input1(J48-22) with the voltage signal(half of Vin2 from internal PMC) output by ACMP’s internal DAC. Terminal will print information corresponding to different comparison result.

Connect ACMP External Input1(J48-22) to stable external voltage generator to avoid floating voltage. The example serial port output may be frequent change otherwise.

Prepare the Demo

  1. Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J5) on the board

  2. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. Launch the debugger in your IDE to begin running the demo.

Running the demo

When the demo runs successfully, following information can be seen on the terminal:

The example compares analog input to the reference DAC output(CMP positive port).

The terminal will print CMP's output value when press any key.

Please press any key to get CMP's output value.

The analog input is LOWER than DAC output

The analog input is HIGHER than DAC output