Em 14/9/2011 00:53, Brent Brown escreveu:
>> a) Ensure the ground connection connects before any other signals,
>> perhaps making it longer or using a special connector;
> Yes, will try to achieve that with standard 0.1" head pins by leaving the=
 GND pins=20
> slightly higher.=20


Simply displacing some pins up may not work, they may not be soldered
correctly to the board or they may limit the insertion of the ones that
weren't displaced and those may not make good contact. Besides, the
amount of displacement would be very limited, perhaps not ensuring that
the ground pins always make contact first.

Right now I'm designing with a bottom-entry 0.1" receptacle and I think
it may help you.

The bottom entry receptacle doesn't limit the length of the pins. If a
pin is too long it will appear over the top of the receptacle, while the
other pins still are correctly connected and at their normal height.

All you need is to remove some (ground) pins from the header and replace
them with pins of a header with longer pins. This way, the ground pins
will be taller than the others and will make contact first. As you push
the daughter board down, the ground contacts will slide along the ground
pins, ensuring good grounding while the remaining pins begin to make
contact.


Best regards,

Isaac

--=20
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