USB 5VDC specs

M

M. Smile

Guest
Hi,

anyone knows the 5VDC tolerance provided from a PC USB 1.1 connection?
I can't find much details with Google.

M.S.
 
From the USB specification:
Click to expand...
7.2.2 Voltage Drop Budget

The voltage drop budget is determined from the following:

ˇ The voltage supplied by high-powered hub ports is 4.75 V to 5.25 V.

ˇ The voltage supplied by low-powered hub ports is 4.4 V to 5.25 V.

ˇ Bus-powered hubs can have a maximum drop of 350 mV from their cable
plug (where they attach to a source of power) to their output port
connectors (where they supply power).

ˇ The maximum voltage drop (for detachable cables) between the
A-series plug and B-series plug on VBUS is 125 mV (VBUSD).

ˇ The maximum voltage drop for all cables between upstream and
downstream on GND is 125 mV (VGNDD).

ˇ All hubs and functions must be able to provide configuration
information with as little as 4.40 V at the connector end of their
upstream cables. Only low-power functions need to be operational with
this minimum voltage.

ˇ Functions drawing more than one unit load must operate with a 4.75
V minimum input voltage at the connector end of their upstream cables.

You can download the USB spec at :
http://www.usb.org/home

Cheers

PeteS
 
Thanks for the info!

M.S.

"PeteS" <ps@fleetwoodmobile.com> wrote in message
news:1122980845.109875.243910@g14g2000cwa.googlegroups.com...
From the USB specification:
Click to expand...
7.2.2 Voltage Drop Budget

The voltage drop budget is determined from the following:

ˇ The voltage supplied by high-powered hub ports is 4.75 V to 5.25 V.

ˇ The voltage supplied by low-powered hub ports is 4.4 V to 5.25 V.

ˇ Bus-powered hubs can have a maximum drop of 350 mV from their cable
plug (where they attach to a source of power) to their output port
connectors (where they supply power).

ˇ The maximum voltage drop (for detachable cables) between the
A-series plug and B-series plug on VBUS is 125 mV (VBUSD).

ˇ The maximum voltage drop for all cables between upstream and
downstream on GND is 125 mV (VGNDD).

ˇ All hubs and functions must be able to provide configuration
information with as little as 4.40 V at the connector end of their
upstream cables. Only low-power functions need to be operational with
this minimum voltage.

ˇ Functions drawing more than one unit load must operate with a 4.75
V minimum input voltage at the connector end of their upstream cables.

You can download the USB spec at :
http://www.usb.org/home

Cheers

PeteS
 
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