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USB Specification - question

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cesare

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USB Spec

Hi All,

does anyone knows the limit of 500 mA that a function can draw from a self powered hub is a peak or average vaule ?

Thanks
 

Re: USB Spec

cesare said:
Hi All,

does anyone knows the limit of 500 mA that a function can draw from a self powered hub is a peak or average vaule ?

Thanks
Click to expand...
this is covered in the spec:

a buspowerd device should never sink more than 500 mA = 5 unitloads.
To avoid peaks the device must implement inrush current limiting.

usbman
 

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