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AT90USB646 Datasheet(PDF) 245 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 245 Page - ATMEL Corporation |
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245 / 456 page  245 7593L–AVR–09/12 AT90USB64/128 Figure 22-8. Host/OTG application with 5V I/O. 22.3.3 Design guidelines • Serial resistors on USB Data lines must have 22 Ω 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 vias 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 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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