MCUXpresso SDK Documentation
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Hardware requirements

Hardware requirements#

  • Micro USB cable

  • EVK-MIMXRT685 board

  • Personal Computer

Board settings#

  • Keep J2 and J19 unconnected to avoid unintentional reset by IF_RST signal in full deep power down mode.

  • For low power purpose, the demo requires pad voltage supply to be fixed as follows: VDDIO_0: 1.8V (connecting JP20 1-2, and PMIC SW2_OUT using default setting 1.8V) VDDIO_1: 1.8V (connecting JP12 1-2, supply from PMIC SW2_OUT)) VDDIO_2: 3.3V (connecting JP27 1-2, and PMIC LDO2_OUT using default setting 3.3V) NOTE: By default, the demo allows wide voltage supply on VDDIO_1. To further reduce the leakage, Vdde1Range can be set to narrow range kPadVol_171_198. Special care should be taken that supplying wrong voltage on the pads is harmful to the device.

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#

The log below shows in the terminal window:

Power Manager Demo.
The "user key" is: SW1
Select an option
        1. Sleep mode
        2. Deep Sleep mode
        3. Deep power down mode
        4. Full deep power down mode
/* Type in '1' into UART terminal */
Entering Sleep [Press the user key to wakeup] ...
/* Press the user key on board */
Pin event occurs
Wakeup.
Select an option
        1. Sleep mode
        2. Deep Sleep mode
        3. Deep power down mode
        4. Full deep power down mode
/* Type in '2' into UART terminal */
Entering Deep Sleep [Press the user key to wakeup] ...
/* Press the user key on board */
Pin event occurs
Wakeup.
Select an option
        1. Sleep mode
        2. Deep Sleep mode
        3. Deep power down mode
        4. Full deep power down mode
/* Type in '3' into UART terminal */
Entering Deep Powerdown [Reset to wakeup] ...
Press any key to confirm to enter the deep sleep mode and wakeup the device by reset.
/* Type in any key into UART terminal */

/* Press the reset key on board. */
Board wake up from deep or full deep power down mode.
Power Manager Demo.
The "user key" is: SW1
Select an option
        1. Sleep mode
        2. Deep Sleep mode
        3. Deep power down mode
        4. Full deep power down mode
/* Type in '4' into UART terminal */
Entering Full Deep Powerdown [Reset to wakeup] ...
Press any key to confirm to enter the deep sleep mode and wakeup the device by reset.
/* Type in any key into UART terminal */

/* Press the reset key on board. */
Board wake up from deep or full deep power down mode.
Power Manager Demo.
The "user key" is: SW1
Select an option
        1. Sleep mode
        2. Deep Sleep mode
        3. Deep power down mode
        4. Full deep power down mode
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