Lpc2000

Hi,

I want to replace my current Atmega128L project (running at 8MHz) 
with a LPC2114 (also to be run at 8MHz). My motive of doing this is 
that LPC2114 is more powerful and is better prepared for future 
upgrade.

However, my project is battery operated. My concern is on the power 
consumption. From lpc2114 datasheet:

1) 3.3V I/O power: since this depends on the load, so this should be 
same as Atmega128L. Is this correct assumption?

2) 1.8v Core power: according to datasheet, lpc2114 running at 60MHz 
draws about 30mA. Can I assume that lpc2114 draws 4mA when running at 
8MHz?

Thanks,
-martin

--- In lpc2100@yahoogroups.com, "mli00" <mli00@y...> wrote:
> Hi,
> 
> I want to replace my current Atmega128L project (running at 8MHz) 
> with a LPC2114 (also to be run at 8MHz). My motive of doing this is 
> that LPC2114 is more powerful and is better prepared for future 
> upgrade.
> 
> However, my project is battery operated. My concern is on the power 
> consumption. From lpc2114 datasheet:
> 
> 1) 3.3V I/O power: since this depends on the load, so this should be 
> same as Atmega128L. Is this correct assumption?
> 
> 2) 1.8v Core power: according to datasheet, lpc2114 running at 60MHz 
> draws about 30mA. Can I assume that lpc2114 draws 4mA when running at 
> 8MHz?


I just checked the total supply current taken by a '2106 flashing a
single LED on my board. The board was supplied with 5.1 V from four
NiMH cells.

At 60 MHz the current was about 56 mA, at 10 MHz the current was about
23 mA (I commented out the PLL initialisation). The LED was taking
about 2.4 mA (I measured the voltage across the resistor with a
scope). I've also got a MAX3232 on my board.

That should give you a rough idea of what to expect from a
representative system.

Leon