2
\$\begingroup\$

Is it possible (and relatively easy) to replace a 5 V power plug (barrel connector) on a USB hub with a standard USB Micro power-only female? If so, is there anything special (besides hooking up the +5 V and GND connections)?

I have been trying to find some information about it, but I haven't been able to. I keep reading stuff about using a 200Ω resistor between pins 2 and 3, but that is for making a custom plug (the USB micro male). Would that also apply to the female?

I'm very much a beginner when it comes to this kind of stuff. I can handle a soldering iron, but I'm quite new to actual electrical engineering concepts.

Some clarification (based on the comments):

  • This is to swap out the barrel connector for the power to the USB hub - nothing to do with the actual USB ports that will be linked.
  • The USB hub is a Belkin F5U404, which makes for a killer little hub for the Raspberry Pi Zero. Problem is the power plug was faulty (if I wiggle it barely it powers off) and quite frankly, when I got half a dozen Pi Zeros, I would like to be able to plug them into any phone charger and not carry around the power cord.
  • I picked up some USB Micro Female connectors from Adafruit
  • The standard power supply for the USB Hub is 5 V / 2600 mA - I'm hoping my 2000 or 2500 mA USB plugs will be sufficient.
\$\endgroup\$
  • \$\begingroup\$ is the purpose to provide external supply ? \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Aug 20 '16 at 2:50
  • \$\begingroup\$ Doing this will likely violate the USB power negotiation specifications, depending on where you source your upstream power. Do you not have the ability to use bus power on the USB hub already? \$\endgroup\$ – user2943160 Aug 20 '16 at 2:53
  • 2
    \$\begingroup\$ If this is the external power input to a usb hub, then yes, all you really need is V+ and Gnd. Pretty much most usb power adapters are dumb chargers and don't need to be enabled or anything, so you can plug it right in. You are only using this as a convenient 5V source. \$\endgroup\$ – Passerby Aug 20 '16 at 2:55
  • 1
    \$\begingroup\$ The resistor across the two data pins are for a Dedicated Charging Port identification. The charger has it. Not the device to be charged. No need here. Just use the V+ and Gnd, no other pins. \$\endgroup\$ – Passerby Aug 20 '16 at 3:38
  • 2
    \$\begingroup\$ If the power connector isn't making connection, it probably has a faulty solder joint. Fixing that joint is easier than wiring to another connector. \$\endgroup\$ – Whit3rd Aug 20 '16 at 5:27
1
\$\begingroup\$

Use of micro-USB receptacle for powering a 4-port USB hub is a poor idea. The official contact rating for micro-USB matching pair is 1.8A only, which is technically insufficient to power all four ports to full capacity.

Regarding the specific questions:

(a) replacing the power jack barrel with u-USB is possible, but is not easy, unless you will glue the u-USB or secure it somehow else, and use fly wires, since PCB footprints are totally incompatible;

(b) the under 200Ω connection between D+/D- is one of the charging port identification signatures, on the port which supplies power, which will be on the other end of your cable. On receiving end nothing should should be connected to D+/D-.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.