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STM32f302RCT6 Y revision package marking problem

Question asked by kalman.roth on Sep 4, 2014
Latest reply on Sep 4, 2014 by kalman.roth
Dear Forumers!

I've just started to solder in the pcb components into my pcb. I have a MCU as in the title mentioned, and I've faced a problem about the chip placement. In the official drawing the package only contains one marking circle, but in the reality the plastic chip package has two orientation marks:
A smaller and deeper left from the ST logo and a bigger and less deeper one above the ST logo.
First I've assumed that the first marking marks the no. 1 pin, but after soldering it and applying the voltage on it, the chip started to eject smoke and now acts as a short cut on the pcb. I have a remnant chip remained and I'd like to know which marks signes the first pin of the controller?

I have no battery option so Vbat is floating, and VDDA comes the same time as the VDD. I think this cannot cause this fatal error.

Any idea?

Thanks in advance!