[SI-LIST] Test criterion of USB voltage drop test
- From: "Sogo Hsu" <sogo.hsu@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 13 Apr 2005 10:47:52 -0000
Hi, USB Gurus,
Currently, we meet an issue in developing USB-IF 2.0 system. The
voltage drop test result indicated the voltage for no loading and
full loading is 5.1V and 4.8V, respectively. Obviously, the voltage
drop is 5.1-4.8=0.3V. Someone said the test criterion for voltage
drop test is 250mV. Accordingly, the test result indicated the USB
system failed in voltage drop test. However, in USB 2.0 spec., the
standard only defined the voltage drop budget has to be greater than
4.75V. I realized that it is better if we can design a power
delivery system with 250mV voltage drop. However, I think it is also
available if we enhanced the power supply voltage slightly. Do you
have any comment? I truly appreciated your feedback. Does the test
result pass or fail in voltage drop test?
Thank you for your helps in advance.
BRs,
Sogo Hsu, Ph. D.
Simulation Center
Foxconn
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