AVR Microcontroller Hardware Design Considerations
Ferrite Bead Another decoupling alternative is to connect the device power and ground pins directly to the planes and connect the decoupling capacitor(s) to the planes as close as possible to the power and ground pins. For large packages, placing decoupling capacitors on the opposite side of the board may be the best way of
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www.silabs.com• Use a ferrite bead for VBUS. Place near receptacle. • Use a switch that can shut off VBUS if current exceeds 500 mA. • Provide at least 96 uF decoupling capacitance on VBUS. Place near USB receptacle. • Terminate D+ and D- with 15 ohm serial resistors. Place near EFM32. • Use an ESD protection device. Place near USB receptacle.
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www.ti.comwith ferrite beads. Separate ferrite beads may be used on each VBUS line to each downstream USB connector. Each ferrite bead on the VCC lines should be rated at 500 ma. Separate ferrites are useful, not only for EMI suppression, but also for their series DC resistance which limits the inrush current during a hot plug event.
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