Lpc2000

--- In lpc2000@yahoogroups.com, "danbeadle" <dan.beadle@i...> wrote:
> 
> I am trying to decide whether to use the LPC family in a battery 
> powered design.  I can spend much of my time reset - so I should be 
> in the 50-500 uA range, which is acceptable.
> 
> Are there better power characterization curves available than the 
> couple of lines in the datasheet
> 
> I18: 
>  Active Mode     30mA         
>                  V18 = 1.8 V, cclk = 60 MHz, 
>                  Tamb = 25 °C, code
>                  while(1){}executed from FLASH, no active
peripherals
> 
>  Power-down Mode 10 - uA V18 = 1.8 V,   Tamb = +25 °C,
>                  50-500 uA V18 = 1.8 V, Tamb = +85 °C - 
> 
> I am looking for power in the Idle Mode (exclusive of pin currents)
> 
> If I can make this low enough, I can use this part.  Some
strategies 
> for lowering the idle power are:
> 
> - Slow PLL to mimimum CPU speed

Turn OFF the PLL, and run at crystal speed. I saw that PLL is the
major power hogger. I was able to reduce current by more than 5 mA by
turning it off. 

Now I am thinking of using some external oscillator from an RTC to
clock the device to reduce the power further more. Would this be
possible?

- Yug

> - Turn off all peripherals except the few needed at the time
> 
> Any help will be appreciated.