Congatec SMARC conga-SMX8-X User Manual page 27

POWER_BTN#
The POWER_BTN# (pin P128) is an active-low power button input from the carrier board. This power button signal is used to wake the system.
Driving this signal low for at least 5 seconds powers off the system immediately.
Power Supply Implementation Guidelines
The operational power source for the conga-SMX8-X is 5 V. The remaining necessary voltages are internally generated on the module with
onboard voltage regulators.
A carrier board designer should be aware of the important information below when designing a power supply for a conga-SMX8-X application:
• We have noticed that on some occasions, problems occur when using a 5 V power supply that produces non monotonic voltage when
powered up. The problem is that some internal circuits on the module (e.g. clock-generator chips) generate their own reset signals when
the supply voltage exceeds a certain voltage threshold. A voltage dip after passing this threshold may lead to these circuits becoming
confused, thereby resulting in a malfunction. This problem though rare, has been observed in some mobile power supply applications. The
best way to ensure that this problem is not encountered is to observe the power supply rise waveform through an oscilloscope. This will help
to determine if the rise is indeed monotonic and does not have any dips. You should do this during the power supply qualification phase to
ensure that the problem does not occur in the application. For more information, see the "Power Supply Design Guide for Desktop Platform
Form Factors" document at www.intel.com.
Inrush and Maximum Current Peaks on VDD_IN
The maximum peak-current on the conga-SMX8-X VDD_IN (5 V) power rail can be as high as TBD A for a maximum of 100
therefore ensure the power supply and decoupling capacitors provide enough power to drive the module.
Note
For more information about power control event signals, refer to the SMARC
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