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Earth Connections

 
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davematt

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Joined: 25 May 2004
Posts: 6
Location: Gippsland, Australia

PostPosted: Sun Nov 14, 2010 12:55 am    Post subject: Earth Connections Reply with quote

Please forgive the dumb question. Do I need to connect all the earth pins on a mega 32 SMD?
TIA, Dave
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mattcro

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Joined: 03 Oct 2007
Posts: 324
Location: Scotland

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PostPosted: Mon Nov 15, 2010 11:16 am    Post subject: Reply with quote

The GND pins are internally connected together, so you could get away with leaving 1 or more of them unconnected... but it's good practice to connect all the GND pins to circuit ground to minimise power rail glitches and give the best performance for analog-digital conversions.

The same goes for Vcc connections - connect them all and use decoupling capacitors as advised in data sheets for the most robust performance, especially where you are sourcing/sinking significant current on the I/O pins.

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