SIMtrace phone-side VCC

Tom Schouten tom at
Fri Jul 26 20:55:32 UTC 2013

Hi folks,

Seems not all phones use 3V signaling if the PHONE-side VCC pin is tied 
to 3V.
This one insists on 1.8V : BLU SAMBA JR PLUS

Is this trick of tying VCC to 3V standard behavior?

For future version of the board, it might be interesting to tie the VCC 
pin to an ADC input, to detect different voltage levels so the firmware 
can wait until phone decides to use 3V.


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