Hardware Low Power Design Guidelines
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SPRAC74A–February 2017–Revised March 2017
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AM335x Low Power Design Guide
Figure 3. Internal Pull Up/Down
2.2.2 Unused Pins
For the most part, unused interface pins can be left as no-connect. However, since unused pins are often
initialized at reset as inputs (RXACTIVE), it is up to the software to mark the unused pins as
RXACTIVE=0, which disables the inputs and prevents unwanted input switching. During system power up,
before Linux software has a chance to configure unused pins, there is a chance that these inputs can float
and cause some current draw if they float to mid-supply levels. However, this is only a concern if low boot
power is a priority and can be fixed with external pull up/down resistors, if absolutely necessary.
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