2.2 Power Supplies

Technology upgrade from 90 nm to 40 nm requires different power supplies.

Table 2-2. SAM9x5 vs. SAM9X60 Power Supplies
Power RailSAM9x5SAM9X60
VDDCORE

VDDUTMIC

0.9-1.1V, 1.0V typical

1.0-1.2V, 1.1V typical

Full CPU speed requires VDDCORE min = 1.1V

VDDPLLA0.9-1.1V, 1.0V typicalVDDOUT25 replaces VDDPLLA. VDDOUT25 is the output of an internal 2.5V LDO and must be connected to an external decoupling capacitor.
VDDOSC1.65-3.6V2.7-3.6V
Figure 2-1. Typical Power Supply Implementations
SAM9x5SAM9X60

Figure 2-2. Recommended Implementation for Full CPU Speed, VDDCORE = 1.15V on SAM9X60

SAM9X60 includes additional power lines to support new features and new peripheral versions.

Table 2-3. SAM9X60 New Power Lines
Power RailSAM9x5SAM9X60
DDR_VREF–Must follow VDDIOM/2
VDDQSPI–1.7-3.6V, 1.8V or 3.3V typical
Figure 2-3. Recommended DDR_VREF Generation on SAM9X60