Saturday 19 April 2014

Why are 32.786Khz crystal cans soldered to PCB?



Every development board I have ever used that includes a 32.786Khz crystal has always had its can soldered directly to board.


What is the reason for this ? Is this to minimize radiated energy from the crystal during its operation (assuming that the pad its soldered to is ground) ?


If the can was not soldered to the board, what would be the effect ?



Added


If you look at this image, the crystal has 3 solder points. Two for the legs, and one for the case/shell/can (green arrow).


My question is about the reason for soldering the case/shell/can to the board.


enter image description here




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