Lpc2000

> Oops!! Sorry, I never study the I2C spec.  Did not know I2C 
> device could be powered off independently and does not 
> disrupt proper operation of bus.  It's true that Philips has 
> all the I2C pins on LPC2xxxx or 8051 as open drain.
> 
> Just some thought, why need removing PMOS and open drain??
> - Most other non-philips uC are having their I2C pins configurable
>   as push-pull output ports.

Maybe these other devices are designed as Master-only on the I2C bus.
Then it's irrelevant if the bus doesn't work when powered off....there's
no longer a master to direct the bus anyway !?

Cheers,
Bruce