I'm having some major trouble with my IR connection with the computer. I got the MCP2140A because it was supposed to take care of the IR stack protocol needed to communicate with the PC, but I'm having trouble getting the computer to recognize it (it usually recognizes it for a second, the doesn't see it anymore despite the fact that it keeps sending IR pulses).

I copied most of my schematic from a demo board of theirs, but still nothing. I don't think the MCU is even needed for the computer to recognize the chip. Just hoping someone out there can see what I'm doing wrong!


(The 6 pin connector is for the MCU programming header)

I don't understand. How are you connecting this to your PC?

Your schematic has a connection between the chip and a PIC. I don't see any connections to anything else.

EDIT: Are you trying to connect this to the computer over that serial connection? Are you using a level converter for RS232?

Reading up on it, it's confusing me more than anything. I've implemented IrDA, but only between uC's, so technically not real IrDA, since I don't need to conform to anything but the PHY layer.

It looks like it's supposed to implement irCOMM itself, but I'm not certain. Have you tried looking at the sample frimware from their demonstration boards, like the logger and temp sensor?

I have the temperature sensor demo board, which works like a charm. I've used it to send and receive info through hyperterminal (after installing a virtual com port). There's no demo board with the MCP2140A, the temp sensor board uses the older version of the chip, the MCP2140, which is similar.