Skip to main content

Questions tagged [usb-2]

Questions relating *specifically* to the USB 2 standard. **Do not use if question is about USB in general.**

Filter by
Sorted by
Tagged with
0 votes
0 answers
46 views

USB 2.0 FS device over USB C with both power directions

I'm designing a battery-powered device with the following requirements: rq1: (a) Charge the device's battery over a USB C receptacle, or (b) provide power over the same receptacle. Both directions ...
WowSuchName's user avatar
3 votes
1 answer
92 views

How can one have a canonically correct USB 2.0 Bus Powered Hub (100ma limit per port) with Type-C Downstream Facing Ports

Through research I am aware that using the CC lines one can advertise "Default" (500mA for 2.0 and 900mA For 3.0+), 1.5A and 3A before getting into PD territory, but none of these include ...
Befitting Display Name's user avatar
3 votes
2 answers
756 views

USB D± : Simultaneous BC 1.2 and USB2.0 data transmission Possible?

Background USB pins D± are used for: USB 2.0 data transmission Battery charging (BC 1.2) Question Can D± be used for USB 2.0 data transmission and BC 1.2, or does BC 1.2 preclude the use of USB 2.0 ...
kando's user avatar
  • 437
1 vote
1 answer
144 views

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 ...
uiguig's user avatar
  • 116
0 votes
1 answer
86 views

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 ...
MRB's user avatar
  • 412
2 votes
2 answers
308 views

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 ...
user1228123's user avatar
1 vote
1 answer
1k views

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 ...
degebine's user avatar
  • 113
0 votes
1 answer
218 views

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 ...
Luc Charbonneau's user avatar
3 votes
1 answer
563 views

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 ...
kadhem Alabdulmuhsin's user avatar
0 votes
2 answers
349 views

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 ...
user135156's user avatar
0 votes
0 answers
278 views

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 ...
weirdgyn's user avatar
  • 257