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Kevin Redon kevredon at mail.tsaitgaist.infoI did some more work. The FPF2005 has no reverse voltage blocker, this is why the 3.3V from the LDO flows back into VCC_PHONE. It even damages the chip (so says the datasheet) I corrected the double power source problem by disabling the LDO (see patch), but still 1.8V does not work and 3.0-3.3V is used. I have to look for other reasons. Also SIMtrace has some issues with 5V signals. Rare are the SIM which only support class A (5V), but the readers often use it (at least 2 of mine). Sometime SIMtrace manages to sniff, but it is not reliable. I will also add class A support in SIMtrace v2. more details are coming in the next days, kevin Excerpts from Kevin Redon's message of Wed Nov 09 21:01:35 +0100 2011: > Hi, > > I found out why class C (+1.8V) capable UICC are still used as class B (+3.3V). > This is because the board provides +3.0V on VCC_PHONE, forcing the phone > to use class B. this voltage is coming from VCC_SIM. > Normally VCC_SIM should only get the power from VCC_PHONE (in sniffing mode), > through the power switch FPF2005, or from the LDO AP3332 (in card reader). > Currently both are enabled (bug). This should be prevented in software as there > is no hardware mechanism to prevent that (fail). > Some power from the LDO is going backwards though the power switch, providing > +3.0V on VCC_PHONE (another hardware fail). > > Also, SIMtrace will not be able to decode +1.8V traffic because Vih > (voltage input high level) is at +2.3V. > One solution would be to power VDDIO at 1.8V, but this is a bad solution > as the USB will not work anymore. > > For the v2 board I intend to have the following: > - 1 translator/level shifter for SIM<->CPU, with selectable 1.8/3.3 > - 1 translator/level shifter for PHONE<->CPU, with selectable auto/1.8/3.3 > - VCC_SIM can be set to VCC_PHONE,1.8V,3.3V > - power forward with diode behaviour > > any correction, comments or recommendation are welcome, > kevin -------------- next part -------------- A non-text attachment was scrubbed... Name: openpcd.diff Type: application/octet-stream Size: 2023 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/simtrace/attachments/20111114/918291c8/attachment.obj>