Power Supply Connections for ATmega328PB

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Looking for "power supply pins VCC AVCC GND AREF description" in 40001907A.pdf

Looking for "AVCC connection recommendations low-pass filter ferrite bead inductor RC" in 40001907A.pdf

Looking for "AREF pin connection recommended capacitor to ground external reference voltage limits" in 40001907A.pdf

Looking for "decoupling capacitors recommendation for VCC AVCC values placement" in 40001907A.pdf

Looking for "Recommended Operating Conditions supply voltage VCC range" in 40001907A.pdf

Looking for "Absolute Maximum Ratings voltage on VCC with respect to GND" in 40001907A.pdf

Looking for "ADC reference options AREF internal reference decoupling capacitor value" in 40001907A.pdf

Looking for "AREF capacitor decoupling 0.1 uF recommendation" in 40001907A.pdf

Looking for "Analog Reference AREF capacitor to ground value" in 40001907A.pdf

Looking for "ADC reference selection internal reference AREF capacitor" in 40001907A.pdf

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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ATMEGA328PB-AU

ATMEGA328PB-AU
Description

Created
Last updated by adrian95
1 Contributor(s)
adrian95

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Properties

Part Type
Microcontroller
Manufacturer Part Number
ATMEGA328PB-AU
Designator Prefix
U

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