USB VBUS Capacitance too high (rev 1)

ffont / official-ddrm-issue-tracker

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USB VBUS Capacitance too high (rev 1) #44

Open ndf-zz opened 3 years ago

ndf-zz commented 3 years ago

On the V1 breakout board, C2 is specified as 100uF. USB2.0 requires at least 1uF and no more than 10uF directly connected to VBUS. Maybe consider replacing C2 with 1.0uF - 4.7uF. Also since the USB connector is a plain B type - consider removing the VBUS switch hardware (IC2) entirely.

DanLeuca commented 5 months ago

Hi,

I have had some really bizzare issues with my breakout board... the LED kept flashing, then dimming, then eventually died. When I checked the grounds with the multimeter they don't seem to link, If I put the multimeter on the LED it lights up. So the LED is fine. Would this be because of what you are talking here? Can I take IC2 out entirely? Pin 1 of IC2 is also supposed to be ground, but again, it does not appear to be connected to the other grounds, maybe IC2 is blown. Thx man.