2014-09-04 05:44 AM
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!2014-09-04 06:47 AM
I've used this thread to show various packages and where the designator is.
https://community.st.com/0D50X00009Xka68SAB
Edit: Fixed DEAD LINK, original post from 4-Sep-2014
2014-09-04 11:03 AM
Thank you, that helped me a lot!