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Power Supply Implementation Guidelines
The operational power source for the conga-SA7 is 5 V. The remaining necessary voltages are internally generated on the module with onboard
voltage regulators.
Note
When designing a power supply for a conga-SA7 application, be aware that the system may malfunction when a 5V power supply that
produces non-monotonic voltage is used to power the system up. Though this problem is rare, it has been observed in some mobile power
supply applications.
The cause of this 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.
To ensure this problem does not occur, observe the power supply rise waveform through an oscilloscope, during the power supply qualication
phase. This will help to determine if the rise is indeed monotonic and does not have any dips. Y 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-SA7 VDD_IN (5 V) power rail can be as high as 5 A for a maximum of 100
µ
s. You should 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
®
specification.
