« previous next »
Pages: [1]   Go Down

Author Topic: Unused D+ D- on USB  (Read 2243 times)

0 Members and 1 Guest are viewing this topic.

Offline uprightsquireTopic starter

  • Contributor
  • Posts: 45
Unused D+ D- on USB
« on: April 07, 2013, 04:22:38 am »
If i use USB as a source of 5v, can I just leave the D+ and D- floating? What happens if this is connected to a computer?
Logged
 

Offline c4757p

  • Super Contributor
  • ***
  • Posts: 7799
  • Country: us
  • adieu
Re: Unused D+ D- on USB
« Reply #1 on: April 07, 2013, 04:45:28 am »
Short answer: Yes, you can, and nothing happens.

Long answer: Read the USB spec if you're not just doing this on your own computer.
Logged
No longer active here - try the IRC channel if you just can't be without me :)
 

Offline digsys

  • Supporter
  • ****
  • Posts: 2209
  • Country: au
    • DIGSYS
Re: Unused D+ D- on USB
« Reply #2 on: April 07, 2013, 05:24:31 am »
I always leave provision for a terminating / id# resistor. Never had to use it and most systems don't bother checking for it,
but you need to be aware of it !! The specs explain what the values mean.
Logged
Hello <tap> <tap> .. is this thing on?
 

Offline amyk

  • Super Contributor
  • ***
  • Posts: 8344
Re: Unused D+ D- on USB
« Reply #3 on: April 07, 2013, 10:44:25 am »
The USB specs are actually quite readable. Much better than ISO's standards at least...
Logged
 
Pages: [1]   Go Up
« previous next »

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf

 


EEVblog Main Site EEVblog on Youtube EEVblog on Twitter EEVblog on Facebook EEVblog on Odysee