2.2.1 Requirements

In the section “Recommended Power Supply Sequencing” in the Electrical Characteristics chapter of the SAMA7D6 Series data sheet, refer to the figures “Recommended Power Sequence at Power-Up” and “Recommended Power Sequence at Power-Down” for the applicable power supply sequencing.

The Power-Up Timing Specification table shows the following:

• There should not be a delay of more than 0.2 ms between the establishment of VDDIN33 and the establishment of VBAT.
• The VDDIN33 rail and periphery group can be established at the same time, or the VDDIN33 rail can be established before the periphery group.
• The periphery group and the core group can be established at the same time, or the periphery group can be established before the core group.
• The NRST signal should be held low for at least 8 ms after the last established supply group.

The Power-Down Timing Specification table shows the following:

• NRST should be held low before or at the same time as the first supply turn-off.

The above power-up and power-down requirements are already implemented in the MCP16502/1 PMIC solutions.