cables - Why is USB Type-A to USB Type-A never used? - Electrical ...
Jul 27, 2022 — USB on-the-go is a slightly different story as a USB OTG device will switch roles between host and device. USB OTG also uses a different connector entirely, an A/B variant that accepts both A and B type connectors, which only exists in the smaller sizes. But this is not what makes USB-A to USB-A cables dangerous.
What are the differences between USB and RS232?
Jun 25, 2012 — USB is formidably difficult to provide low level interfaces for. "Simple" interfaces are common but these provide and hide a very large degree of related complexity. RS232 was intended as a 1:1 relatively low speed semi-standardised interface between 1 computing device and 1 peripheral per port with hardware control being an integral part of ...
usb device - What is the difference between usb root hub and usb …
Jun 16, 2018 — USB hubs implement insertion/removal detection, port power control and the upstream side of the enumeration protocol that is used before the device is assigned a number. The same functionality is required for each USB downstream port, whether it is directly attached to the controller or part of a separate device, and it would be silly to have ...
Why does micro USB 2.0 have 5 pins, when the A-type only has 4?
Before USB OTG was popular, the 5th pin was an auxiliary pin to allow the USB port on portable devices to be used for other purposes via passive components/circuits. A resistor array in the cable would indicate the function of the cable to circuitry in the device. Sometimes this could be a composite TV out, but it was mostly used for audio.
What exactly are the differences between a USB host and device
USB host is the USB on the PC side in most cases and USB Device is the USB in your mouse ,keyboard, flash memory and so on. All USB transactions are managed by the Host. and the Device only responses to the Host transactions. Hope that helps.
STM32 "USB Device" vs. "USB OTG HS" - what is the difference?
May 16, 2016 — I recently downloaded the stm32 app for MCU search and found out that for example STM32F429 has "NO" in "USB Device" peripheral, while it says "YES" in "USB OTG FS" and "USB OTG HS". Which is quite surprising since STM32F429 is fully functional as USB Device, i.e. it supports all the libraries and USB classes.
Wiring diagram for USB-C to USB-A cable?
Aug 9, 2017 — 17. I make USB cables (USB-A to Mini or Micro primarily), but don't have any experience with USB-C. I would like to create a cable that has a USB-A (2.0) connector on one end, and a USB-C connector on the other (mainly for connecting keyboards to CPUs, and charging devices).
Are USB type C pull resistor neccesary on CC and SBU pins?
Sep 25, 2021 — For the USB-C connector, additionally changes are needed for the host role. CC1 and CC2 should have a pull-up resistor of 36kΩ to 3.3V (or 56kΩ to 5V) instead of the pull-down resistors. As a host, the Raspberry Pico can no longer draw power from the USB bus. Instead, it must have an independent power supply and provide power to the USB bus.
How can I tell charge-only USB cables from USB data cables?
You can test for continuity or resistance using a multimeter. Probe between the corresponding data pins: D+ on one side to D+ on the other, or D- to D-. The D+/D- lines are the middle two pins of a USB connector. Just select one on one side of the cable, and test continuity to both of the middle pins on the other side.
What exactly do D+ and D- on a USB connection do?
Dec 1, 2019 — But the other two pins D+ and D- what exactly do they do? whats their function? I think these pins transfer signals to and from the usb device to the computer and vice-versa. An Electronics StackExchange answer says the two pins refer to differentially encoded transmission scheme that USB uses. What is differentially encoded transmission scheme?