Lpc2000

Does anyone know what the power consumption of the LPC210x or 211x is 
with the CPU in IDLE mode and only the RTC running?  I can only find 
figures for active and power down modes, but not idle mode.

Also, how much power could be saved by turning off the PLL and 
running from the crystal oscillator directly.

I need to minimize power consumption and wake up periodically to log 
data.  I'd like to do this without adding additional components as 
this is a cost sensitive application.

I observed that when PLL is on, I cannot bring down the power 
consumption equal, to that of when Boot loader is running, I wonder 
what boot loader is doing (if at all other than sleeping). 

But otherwise sleep mode definitely reduces a lot power consumption, 
but still not up to mark. 

Is it possible for the chip to work properly even if PLL is not used??

Thanks
Yug

--- In lpc2000@yahoogroups.com, "dave_albert" <david_albert@h...> 
wrote:
> Does anyone know what the power consumption of the LPC210x or 211x 
is 
> with the CPU in IDLE mode and only the RTC running?  I can only 
find 
> figures for active and power down modes, but not idle mode.
> 
> Also, how much power could be saved by turning off the PLL and 
> running from the crystal oscillator directly.
> 
> I need to minimize power consumption and wake up periodically to 
log 
> data.  I'd like to do this without adding additional components as 
> this is a cost sensitive application.

Hi Yug,

the device works perfectly well with PLL, just slower. The PLL alone
is probably consuming around 1 mA and with the PLL disabled, the whole
device is slower, so it uses less power in idle mode.
You should also set the VPB-divider to divide the peripheral clock by
4, this will save another couple mAs.

Hope this gets you closer to your target power consumption

Cheers, Bob

--- In lpc2000@yahoogroups.com, "yugandhar_vasi" <yvasi@k...> wrote:

> I observed that when PLL is on, I cannot bring down the power 
> consumption equal, to that of when Boot loader is running, I wonder 
> what boot loader is doing (if at all other than sleeping). 
> 
> But otherwise sleep mode definitely reduces a lot power consumption, 
> but still not up to mark. 
> 
> Is it possible for the chip to work properly even if PLL is not used??
> 
> Thanks
> Yug
> 
> --- In lpc2000@yahoogroups.com, "dave_albert" <david_albert@h...> 
> wrote:
> > Does anyone know what the power consumption of the LPC210x or 211x 
> is 
> > with the CPU in IDLE mode and only the RTC running?  I can only 
> find 
> > figures for active and power down modes, but not idle mode.
> > 
> > Also, how much power could be saved by turning off the PLL and 
> > running from the crystal oscillator directly.
> > 
> > I need to minimize power consumption and wake up periodically to 
> log 
> > data.  I'd like to do this without adding additional components as 
> > this is a cost sensitive application.