Quote Originally Posted by Tom Estes View Post
Just a guess here but the NS73M is not 5V tolerant. The pins connected to the PIC should be level compensated to match the logic levels required for the NS73M or a 3V PIC should be used.

I use the NS73M quite reliably but not in I2C mode and my routines are written in Swordfish so I can't really comment on your code. Sorry I can't help more.....

Tom
If you want post the code.
Thanks