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USB Device

The SAM3U4 UDPHS port is compliant with the Universal Serial Bus (USB) rev 2.0 High Speed device specification. J21 is a micro B-type receptacle for USB device. Both 39-Ohm resistors R2 and R3 build up a 90-Ohm differential impedance together with the (embedded) 5-Ohm output impedance of the high speed channel drivers.

The SAM4S16 UDP port is compliant with the Universla Serial Bus (UCB) V2.0 Full Speed device specification. J20 is a micro B-Type receptable for USB device. Both 27-Ohm resistors R2 and R3 build up a 90-Ohm differential impedance together with the (embedded) 6-Ohm output impedance of the high speed channel drivers.

R126 and R143 build up a divider bridge from VBUS +5V to implement plug-in detection (5V level gets lowered to a PIO compatible 3.3V level) through PC9 of SAM4S16.

 


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