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AT90USB646 Datasheet(PDF) 250 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 250 Page - ATMEL Corporation |
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250 / 459 page  250 7593H–AVR–11/08 ATmega32U6/AT90USB64/128 Figure 21-8. Host/OTG application with 5V 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 possibles, and follow differential traces routing rules (same length, as near as possible, avoid vias accumulation). • Voltage transcient / 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 UDP UDM VBUS UVSS UID D- D+ VBUS UID UGND 1µF External 5.0V Power Supply UCAP UVCC AVCC VCC XTAL1 XTAL2 GND GND UVCON 5V Rs=22 Rs=22 |
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