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Forum Post: RE: Unknown USB Device (Device Descriptor Request Failed)

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Hi Tyler, Well, if you are following Figure 8 of SLAA457A document, then I see one difference in your hardware layout vs. what is suggested there. - The 27 ohm resistors on D+ and D- lines should be placed after the 10pf capacitors and closer to the VBUS source. In your hardware design, I see that these resistors are closer to the MSP430. Other differences I see - no ESD suppressor or the diode on VBUS. Also thanks for pointing out some issues with the Descriptor Tool. Regards, Arthi

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