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Kevin Redon ml at mail.tsaitgaist.infoThanks for the info. I did not looked into it yet, but will either try to fix it in software (the pullup is a good start) before designing the second version of SIMtrace, or add a filter, cap, or pull-down if this is not possible. Kevin Excerpts from Tom Schouten's message of 2013-08-16 17:38:52 +0200: > Hi List, > > When the SIMtrace ciruit operates in MitM mode, the RST and VCC lines > coming from the phone are very noisy from I/O line crosstalk in the flex > cable. > I see about 2V peak-to-peak on the scope! > > I am expecting it leads to spurious reset/poweroff detections. > > It might be helpful to add a filter on the AT91 side for RST and VCC. > Maye an R/C filter that can be enabled by an I/O pin using 0/HI-Z switching? > > Another idea is to do enable the internal AT91 pin pullups. > Just loading RST and VCC a bit might be enough. > > ( Another alternative is to filter RST and VCC measurements in > software. I tried this but results are not very meaningful at this > point.. ) > > Cheers, > Tom