| Commit message (Collapse) | Author | Age | Files | Lines |
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there is now a high-level command by which we can swithc the VCC
supply of the SIM cards.
For some reason, the _PASS variant (passing through the voltage from the
phone) doesn't seem to work reliably. It might be that we are draining
reverse current throught the LDO once we supply SIM power that way.
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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.
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This is just a temp rework in the 1st generation prototype, as the bus
switch has too high resistance for passing throuhg Vcc from the phone
to the SIM.
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