Lpc2000

OK,

here we go, let's go OKI. Let's just assume our device follows the
ratio between current used for core and current used for I/O as the
OKI device, let's compare.

The OKI 674001 series is specified with typical 40 mA running @ 33 MHz
while I/O current is typical 18 mA @ 33 MHz. So I would consider the
core current to be MUCH more significant than the I/O current.

May be I missed something in the OKI Manual but what is running while
the "typical" power consumption for I/O is measured? One timer, all
timers, one serial interface, all serial interfaces...???

My point being, the typical power comsumption of the OKI device at 33
MHz is higher than the LPC2106 at 60 MHz and whether it is specified
in more detail than the LPC2000 devices, granted we have work to do
but to make a qualified decision which one is better in power
comsumption the data is there.

The typical for the 675001 at 60 MHz is much higher (75 mA) than that
of the LPC2124 @ 60 MHz.

And we are only talking mA not even Volts. Taking the Volts into
account, 2.5V * 75 mA typical versus 1.8V * 50 mA typical makes a nice
factor of 2.   Approx. 190 mW versus 90 mW

If you think you need to go for the great OKI device because of a more
detailled (but much higher) power spec, I won't be able to stop you. 

Sorry for being a little defensive here, Robert

Hint: The power supply for your board is highly depending on your I/O
drive requirements. Add to those worst case I/O requirements 50 mA for
the micro at full speed and you will do fine.If you want to make it
bullet proof at -40C, and running the micro at 2V insteadof 1.8V, add
70 mA instead of 50 mA

--- In lpc2000@yahoogroups.com, redsp@y... wrote:
> --- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...>
wrote:
> > Hi,
> > 
> > power consumption has to be specified in an enviroment that everybody
> > can reconstruct. As soon as an application is involved, this does not
> > hold true any more. The power consumption of the peripherals is rather
> > low compared to the CPU and the memory itself. 
> > 
> > I/O currents are completely indenpendent from the chip itself, they
> > are solely depending on your (or somebody else's) application and are
> > not representative for the micro.
> 
> That is where we disagree.  If I could "reproduce" the measurement,
> then I would just make the measurement myself and I would not need the
> data from you.  
> 
> I need a reasonable approximation for a realistic power consumption. 
> I think everyone understands that power consumption is a function of
> what software/hardware is running at the time.  The number in the data
> sheet is meaningless (literally since I don't even know if it is
> accessing Flash or RAM) and has no value in estimating requirements
> for a power source.  I don't know if I need to provide 50 mA or 500
mA.  
> 
> If I can't come up with some sort of number to allow me to size a
> power supply, I'll just use another MCU that provides better data,
> like the OKI parts.