Power filtering

• 1 x 100nF bypass capacitor per power pin
• 1 x 100nF bypass capacitor for two analog power pins ( if two pins are very close)
• Add a PI filter for analog power rails (Ferrite bead + 2 capacitors)
• For high power chips (CPU, Ethernet phy, etc…) add two spares 0603 capacitors per power rail
• Next to connectors, add one 0603 10uF capacitor and two 100 nF capacitors.
• For noisy devices like motor or HDD, add a ferrite bead