Hardware requirements

  • Type-C USB cable

  • FRDM-MCXC444 board

  • Personal Computer

Board settings

Connect J4-11(DAC_OUT) to J4-11(PTE30/ADC0_SE23) and shorten jumper JP6 to use external reference voltage pair pins.

Prepare the Demo

  1. Connect a type-c USB cable between the host PC and the MCU-Link USB port (J13) on the target 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. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.

Running the demo

This following section shows how to run the demo:

DAC ADC Demo!

ADC Full Range: XXXX

Press any key to start demo.

Demo begin...
ADC16_DoAutoCalibration() Done.

The user is prompted to enter a voltage to output on the DAC:

Select DAC output level:
        1. 1.0 V
        2. 1.5 V
        3. 2.0 V
        4. 2.5 V
        5. 3.0 V

After entering a valid input, the ADC captures the voltage set by the DAC
and displays the result in the terminal:

Select DAC output level:
        1. 1.0 V
        2. 1.5 V
        3. 2.0 V
        4. 2.5 V
        5. 3.0 V
->3
ADC Value: 2471
ADC Voltage: 1.99
What next?:
        1. Test another DAC output value.
        2. Terminate demo.

At this point, the user can test another DAC output value or terminate the demo.

This configuration exhibits up to 2% error when reading back voltage.