USB Suspend Current enforcement

> For ones *I* design, the current limit is implemented with one of these:
> http://www.ti.com/product/tps2560a
> I set the current limit so that it's comfortably above 500ma for USB2 (or 
> 900mA for USB3).  The current limit could be set to that it's exactly 
> those values and still comply with the USB standard, but experience says 
> that might cause problems with certain devices that have an out of spec 
> inrush current (e.g. hard disk startup).
> 
> Regards,
> Allan

I see...So for the ones you design. Do you enforce suspend current to 2.5mA or 100mA (for battery powered devices) or is the limit in suspend still 500mA (USB2)?

On Wed, 25 Feb 2015 12:14:33 -0800, goata007 wrote:

>> For ones *I* design, the current limit is implemented with one of
>> these: http://www.ti.com/product/tps2560a I set the current limit so
>> that it's comfortably above 500ma for USB2 (or 900mA for USB3).  The
>> current limit could be set to that it's exactly those values and still
>> comply with the USB standard, but experience says that might cause
>> problems with certain devices that have an out of spec inrush current
>> (e.g. hard disk startup).
>> 
>> Regards,
>> Allan
> 
> I see...So for the ones you design. Do you enforce suspend current to
> 2.5mA or 100mA (for battery powered devices) or is the limit in suspend
> still 500mA (USB2)?

It's the same > 500mA limit regardless of the state, as long as the port 
is enabled.  My products don't have "suspend".

Regards,
Allan