Embedian, Inc.
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SMARC-iMX8M Computer on Module User’s Manual v.1.0
Figure 29: Power‐Up Sequence
If the operating system supports it, a shutdown sequence can be initiated.
Some systems may benefit from shutting down instead of just removing the
main power supply as this allows the operating system to take care of any
housekeeping (e.g. bringing mass storage devices to a controlled halt). Some
operating system may not provide the shutdown function.
As it is not permitted that a lower voltage rail is present when a higher voltage
rail has been switched off, the sequence of shutting down the peripheral
voltages needs to be considered. The lower voltages (e.g. peripheral 3.3V)
need to ramp down before the higher ones do (e.g. peripheral 5V).