What's the WATT / power output of USB 2.0 and USB 3.0

[emilfrolund]

Hey,

What's the WATT / power output of USB 2.0 and USB 3.0

 

[kanewolf]

Wikipedia has all -- https://en.wikipedia.org/wiki/USB#Power

 

[emilfrolund]

Wikipedia has all -- https://en.wikipedia.org/wiki/USB#Power

Problem is i Dont understand what wiki says about the topic

 

[kanewolf]

The first question is for device power or charging?
Device Power:

There are limits on the power a device may draw, stated in terms of a unit load, which is 100 mA, or 150 mA for SuperSpeed devices. There are low-power and high-power devices. Low-power devices may draw at most 1 unit load, and all devices must act as low-power devices when, starting out as, unconfigured. High-power devices draw at least 1 unit load and at most 5 unit loads (500 mA), or 6 unit loads (900 mA) for SuperSpeed devices. A high-powered device must be configured, and may only draw as much power as specified in its configuration.[88][89][90][91] I.e., the maximum power may not be available.

Charging:

Per the base specification, any device attached to an SDP must initially be a low-power device, with high-power mode contingent on later USB configuration by the host. Charging ports, however, can immediately supply up to at least 1.5 A. More current may be supplied up to the maximum current of 5 A, but the charging port may apply current limiting, or even shut down. The maximum current is determined by the over-current protection maximum current in the baseline specification. Note that it is specified only that USB connectors are tested to a contact current rating of at least 1.5 A.[95]

 

[emilfrolund]

Its for device

 

[kanewolf]

500mA x 5VDC == 2.5W for USB2, 900mA x 5VDC == 4.5W for USB3 -- These are MAX values. That data was in the table on the Wiki page. If you didn't pick that up, because "i Dont understand" then you probably shouldn't be messing with any non-standard USB devices.