Hi,

I'm trying to get a MCP2140 (IrDA stack controller) working without much
success. I'm using the Agilent HSDL-1001 for the optical interface, and
I know it works well because it does work when used with the MCP2150.

I think that the problem is at the conditioning of the RXPD signal. The
datasheet mentions the digital transistor MUN211T1, but I think it
refers to the OnSemi MMUN2111LT1, so I used it. I checked the signal
with the oscilloscope, and somehow the output of the transistor doesn't
go back to 0 after a pulse is received but only after a 'long' time.
Then I tried with a normal transistor, but it was the same, at least it
doesn't work yet (don't have the oscilloscope here with me now, but the
PC should find an IrDA device...). Finally, I have placed a nice 74HC14
instead of the transistor, but again it doesn't work.

Anybody else using the MCP2140 that could share the RXPD section
details?
Or are the samples broken...?


Sincerely,
Moises Cambra

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