Questions relating *specifically* to the USB 2 standard. **Do not use if question is about USB in general.**
Questions tagged [usb-2]
8 questions
2
votes
2 answers
USB 2.0 ground connection for communication with STM32
Is there any specification for the allowed impedance to ground for the GND pin of a USB2.0 connection to an STM32 microcontroller?
I'm not using VBUS to power my PCB, so it's not really connected. If I don't connect the USB ground at all and only…
user1228123
- 183
- 6
2
votes
1 answer
How do I short D+/D- pads on usb type c connector?
I am working on a design which utilizes a USB type c connector. My question is what is the proper way of connecting the duplicate D+/D- pads? and do you recommend a specific trace width/ via size?
You can check how I did it in the attached…
kadhem Alabdulmuhsin
- 31
- 2
1
vote
0 answers
Is it possible to charge a device at higher power while maintaining USB 2.0 data transfer?
What I've got:
A car with a USB port that only supplies 500 mA.
An android phone with USB-C that supports QC3.0 and PD2.0
...So the phone discharges while driving with Android Auto.
What I want:
I want to improve this so the phone actually…
uiguig
- 106
- 9
1
vote
1 answer
Connecting USB-C port with ATmega32u4 - Questions
I'm a beginner when it comes to schematics. I'm attempting to create a USB-C + Atmega32u4 schematic. Later I will add cols and rows for keyswitches (usb keyboard).
Below is the schematic I came up with so far. It's based on combining these two…
degebine
- 113
- 2
0
votes
1 answer
USB2.0 vs USB 3.0
I have read that USB 3.0 can provide 900mA of current where as USB 2.0 can provide 500mA both at 5V.
I understand in USB 2.0 there are 4 connections, Vcc, Data+, Data- and GND. In USB 3.0 there are these pins plus Tx+, Tx-, Rx+, Rx- and GND (i.e.…
MRB
- 382
- 3
- 13
0
votes
1 answer
USB-C camera wired for USB 2.0 in circuit layout
I'm a bit confused about the USB 2.0 portion of a USB-C pinout.
We have two cameras that operate over USB-C, but they are also compatible with USB 2.0 because we can use them successfully through USB 2.0 when plugged into our laptop.
Our actual…
Luc Charbonneau
- 5
- 2
0
votes
2 answers
USB-3 Type A Connector Current Drain
I have a USB 3 Type A (i.e. 9pin connector) connector on my PC and connected to a USB 3 Type A connector on my PCB with a USB 3.0 Cable. This USB3 A Type connector on my PCB is connected to FT232H chip. It means i am having USB 2 Communication…
user135156
- 49
- 1
- 4
0
votes
0 answers
USB hub upstream power backfeed
I'm designing a board that implements a USB hub. The upstream port will be connected to an Android tablet (or something like that) and the downstream ports will feed some other devices.
The board itself will be self-powered from a battery and…
weirdgyn
- 253
- 1
- 5
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