[TriEmbed] Ground Confusion

[Jeffrey Crews]

Apropos of nothing, the same issue arises in guitar wiring; you can get hum
if you have ground loops.

jsc


On Thu, May 1, 2014 at 2:29 PM, Martin Brooke <martin.brooke at duke.edu>wrote:

> ​If you are using the chip for 3.3 V out you do not need to worry.
>
> The problem arises when you use the resistors R1 and R2 to support a
> higher output voltage.​
>
> If the ground on Resistor R2 (see page 12 of the data sheet) is not very
> close to pin 9 you could get small voltages due to current in the ground
> paths making your circuit behave unexpectedly.
>
> ​The example PCB in the other document you had on the dropbox has this
> type of layout​.
>
> For the 3.3V case the resistors are internal to the IC and so you need not
> worry.
>
> If you are worried about ground use a two layer board and make the back
> ground, avoiding any long gaps, or large holes in the back ground plane.
>  Then just use vias to that ground plane for all your ground connections.
>
> Cheers,
>
> Martin
>
> _______________________________________________
> Triangle, NC Embedded Computing mailing list
> TriEmbed at triembed.org
> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
> TriEmbed web site: http://TriEmbed.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20140501/27ad5307/attachment.htm>