49.2.1 Power Supply Connections

Figure 49-1. Single Power Supply Schematic
Figure 49-2. Dual Power Supply Schematic
Table 49-1. Power Supply Connections, VDDCORE From Internal Regulator
Signal NameRecommended Pin ConnectionDescription
VDDIO

Decoupling/filtering capacitors (1)

I/O supply voltage
AVDD

Decoupling/filtering capacitors (1)

Ferrite bead(1,2) prevents the VDD noise interfering with AVDD

Analog supply voltage
VDDIN

Decoupling/filtering capacitors (1)

Digital supply voltage
VDDCORE

Decoupling/filtering capacitors (1)

Core supply voltage / external decoupling pin
GND-Ground
AVSS-Ground for the analog power domain
Note:
  1. Refer to Power Supply Electrical Specifications from the Electrical Characteristics chapter for recommended values and placement.
  2. A ferrite bead should be added between the main power supply (VDDIO) and AVDD to attenuate high frequency digital noise from entering the analog power domain. The bead should provide enough impedance to help isolate digital and analog power domains. Make sure to select a ferrite bead with a low DC resistance to avoid any relevant IR drop across the ferrite bead that could impact analog peripheral(s) performance. Refer to Table 46-4. Power Supply Electrical Specifications for recommended values.