Follow the recommendations listed
below:
- The power requirement for
each of the supply rail varies based on the interfaces used and the
operating environment.
- The current draw of processor
supply rails can be estimated using the PET (Power Estimation Tool).
If the supply rail powers the other on-board attached (peripheral) devices,
the maximum current draw of these devices needs to be included.
- Verify if the output current
ratings of the selected power architecture (including PMIC, DC/DC converters
and LDOs) meet the maximum current requirements of processor and all
attached devices. It is recommended to add some additional margin for design
variances.
- Verify if the recommended
power supply sequence (Power-Up and Power-Down) is being followed. Proper
power supply sequencing in correlation with resets and clocks is
recommended. For the recommended power sequencing requirements, refer the
Power Supply Sequencing section of device-specific data
sheet.