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ATmega16U4 Datasheet(PDF) 257 Page - ATMEL Corporation |
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ATmega16U4 Datasheet(HTML) 257 Page - ATMEL Corporation |
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257 / 408 page  257 7766D–AVR–01/09 ATmega16U4/ATmega32U4 Figure 21-6. Typical Self powered application with 3.0V to 3.6 I/O 21.3.3 Design guidelines • Serial resistors on USB Data lines must have 22 Ohms value (+/- 5%). • Traces from the input USB receptable (or from the cable connection in the case of a tethered device) to the USB microcontroller pads should be as short as possible, and follow differential traces routing rules (same length, as near as possible, avoid via accumulation). • Voltage transient / ESD suppressors may also be used to prevent USB pads to be damaged by external disturbances. •U cap capacitor should be 1µF (+/- 10%) for correct operation. • A 10µF capacitor is highly recommended on VBUS line 1µF External 3.0V - 3.6V Power Supply UDP UDM VBUS UVSS UID UCAP D- D+ VBUS UID UGND UVCC AVCC VCC XTAL1 XTAL2 GND GND Rs=22 Rs=22 |
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