Lpc2000

Hello G,

the 1.8V supplies all logic on the device, no matter whether it is the
CPU or peripherals. This is the power consumption of the chip. On the
other hand, the 3.3V supplies I/O drivers only (and the analog part of
the ADC). This supply is virtually "0" as long as you don't drive
external load. Driving externally 2 mA adds 2 mA to the 3.3V current.
In other words, the 3.3V power consumption is only limited by your
application and the max power dissapation of the whole
microcontroller, it is not something the the microcontroller per say
uses. It is the external components that use this power. Not included
in the power measurement or better, our tests would only find the
current necessary to drive the logic gates that in turns drive some LEDs. 

Hope I could make it clear why 3.3V is not really part of the
microcontroller power consumption.

Regards, Robert

--- In lpc2000@yahoogroups.com, "golssa" <golssa@y...> wrote:
> Hello Robert,
> 
> > A device coming from Reset has all peripherals enabled and running 
> at
> > max speed 60 MHz with MAM and PLL enabled uses between 35 mA and 40 
> mA
> > when executing the Blinky program.
> 
> how does this 40mA divide over the 3.3V and 1.8V rails?
> 
> bye,
> G