[App_rpt-users] CM108 fobs on Ebay

[Matt Beasant]

Thanks Andrew,

Yup already had them apart and the chip is not blobbed, its all pins
exposed like the earlier ones so if it is the case that the GPIO pins are
not brought out, at least the pin is still available, happy days!

Cheers,

Matt
On 10 December 2011 13:20, Andrew Errington <a.errington at lancaster.ac.uk>wrote:

> On Sat, 10 Dec 2011 22:02:01 Matt Beasant wrote:
> > Hi all,
> >
> > Attention UK node owners or prospective node owners......
> >
> > I have just purchased a bunch of CM108 USB fobs from Ebay and confirm
> that
> > they work with ACID systems.
> >
> > They have extra buttons on them ( vol up / down and mute ) so this MAY
> make
> > it easier to wire out to the PTT and COS lines but I have yet to modify
> one
> > so cannot confirm if this is the case.
>
> COS is usually wired to one of the volume pins, so that should be no
> problem,
> but PTT is wired to a GPIO which usually has no other function.  If the
> chip
> is epoxy-blobbed then there is no reason to bond out the GPIO pads on the
> chip.
>
> That particular housing is very easy to open using a fingernail.  Just
> tease
> the two halves apart at the join.  You will be able to easily see if the
> chip
> is packaged or epoxy-blobbed.
>
> 73,
>
> Andrew
> ZL3AME
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