8.2.1 Power Supplies

The SAM R30 has several different power supply pins:

  • VDDIO powers I/O lines and XOSC. Voltage is 1.8V to 3.63V
  • VDDIN powers I/O lines, OSC16M, the internal regulator for VDDCORE and the Automatic Power Switch. Voltage is 1.8V to 3.63V
  • VDDANA powers I/O lines and the ADC, AC, and PTC. Voltage is 1.8V to 3.63V
  • VBAT powers the Automatic Power Switch. Voltage is 1.8V to 3.63V
  • VDDCORE serves as the internal voltage regulator output. It powers the core, memories, peripherals, DFLL48M and FDPLL96M. Voltage is 0.9V to 1.2V typically.
  • The Automatic Power Switch is a configurable switch that selects between VDDIN and VBAT as the supply for the internal output VSWOUT; see the figure in 8.1 Power Domain Overview.

The same voltage must be applied to both VDDIN and VDDANA. This common voltage is referred to as VDD in the data sheet.

When the Peripheral Touch Controller (PTC) is used, VDDIO must be equal to VDD. When the PTC is not used by the user application, VDDIO may be lower than VDD.

The ground pins, GND, are common to VDDCORE, VDDIO and VDDIN. The ground pin for VDDANA is GNDANA.

For decoupling recommendations for the different power supplies, refer to the schematic checklist.