[hpsdr] [OZY] Initial OZY Schematic Posted For Review andComments- May 10, 2006

[Lyle Johnson]

>> 3. Can you bring the I2C lines out to a header on the edge of the board for
>> adding external I/O
> 
> Can do.

Past experience suggests that I2C might get unreliable if too much is 
added to it.  Might want to consider an I2C buffer/extender chip for 
this.  Philips P82B715 or P82B96.

73,

Lyle KK7P


>> 5. For (protected) user inputs  can you add an 8 bit 74LCX541 with a
>> connector on the board edge to take PTT, dot, dash, GPS 10k/1pps etc
>>
>> 6. For user outputs perhaps an open collector driver such as an UNL2003AD to
>> a connector on the board edge
> 
> This will depend on other things like whether we put SRAM on the OZY
> board and how much IO I actually end up with.  It might be a better
> idea just to limit the off board IO to the ATLAS lines and design a
> plug-in IO board with protected ins/outs, etc... to handle the things
> we need.

Sounds like a good idea to put these on the IO card :-)

73,

Lyle KK7P


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