Power Supply Connections for ATmega328PB

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Gathering ATmega328P details.

Here’s exactly what the ATmega328PB needs for power, per the datasheet, plus best-practice decoupling so it’s stable and quiet.

Datasheet-verified essentials

Supply range: VCC operating voltage is 1.8–5.5 V; Absolute Max VCC is -0.5 V to +6.0 V.
VCC: connect to your regulated supply within the 1.8–5.5 V range.
GND: connect to ground.
AVCC: must be externally connected to VCC even if the ADC is not used. If the ADC is used, connect AVCC to VCC through a low-pass filter.
AREF: this is the ADC’s analog reference pin. Connect it according to the ADC reference you plan to use (external reference vs. internal reference). See the ADC/reference section in the datasheet for the specific configuration you choose.

Best-practice decoupling and filtering (recommended)

Place a 100nF Capacitor at each VCC-to-GND pair, as close to the MCU pins as possible.
Add one nearby bulk decoupler on the rail, e.g., a 10uF Capacitor.
If using the ADC, implement the AVCC low-pass filter. A common approach is a Ferrite Bead (or small R) between VCC and AVCC with a local 100 nF (and optionally a small bulk cap) from AVCC to GND.

Quick checks to proceed

What supply voltage will you use (3.3 V or 5 V)?
Will you use the ADC? If yes, do you prefer a ferrite bead or a small resistor for the AVCC filter, and do you want an external reference on AREF or the internal reference?

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Layout guidance

106 days

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