Linux-Hams archive - June 1999: Re: New SCC card design

Re: New SCC card design

Luis Yanes (cre@eproxy02.telekom.at)
Wed, 16 Jun 1999 03:45:40 +0100

Thomas Sailer wrote:
>
> Ivo Simicevic wrote:
>
> > Chips like e.g. Motorola MPC860T have 4 10Mb/s and 1 100Mb/s channel and
> > would give us opportunity of very high speed packet in future.
>
> Nice chip, but how exactly are you going to solder a uBGA part in
> a hobby project? 8-)

What are the ball pitch of these uBGA?

BGA and FGA,with a lot of work, can be done. May be that CSA also, but
I don't want to think about ever!

BGA has 1.5mm ball-ball spacing, enought to convert without difficult
to "hole-throught" soldering small pieces of wire to each ball and
carefully aligning the pins to plug in the well aligned PCB holes!
I tried with a dead chip and certainly can be done. But if the chip
is in BGA usually has a lot of pins!

The FGA has 1mm ball-ball and should be possible also, but really
more harder, and of course the PCB difficult to built. CSA are
0.8mm ball-ball that I don't felt comfortable with the idea.

Also there is adapters to hole-throught, but very expensives.

Other idea are a nail bed and fasten the chip to keep the presure.

BGA: Ball Grid Array
FGA: ball Fine pitch Grid Array
CSA: ball Chip Scale Array

-- 
73's de Luis


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