Lpc2000

Thanks for the excellent summary.

I realize that it is hard to specify the power consumption, because 
there are so many variables.  The "acceptance criteria," for all 
items at worst case condition is certainly valuable, and I believe 
should be added to the data sheet.  It might be helpful to include a 
couple of other "typical" values in the data sheet, and perhaps some 
graphs showing how it varies with voltage, temperature, etc.

In the meantime, I think the information in this posting should 
suffice for most people.

Do you have any Active Mode suppy current numbers for LPC2138?

As far as identifying myself, my company has a policy of engineers 
not including any identifiable information in public forums, so as 
not to reveal what we are working on, or what technology we are 
using, before products are announced.  I ssume you can understand.



--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
> 
> Hello, 
> 
> You are right that the value for typical changed and unfortunately
> both values did not hit the mark that we saw on the bench. While 30 
mA
> was too low, 60 is too high. 
> 
> Acceptance criteria for test is 70 mAs max, this includes temp
> variation and chip-to-chip variations. So consider 70 mAs the max
> value. Test is done with peripherals enabled, that means, the clock 
is
> provided to most of the flipflops, which causes the current
> consumption. Running the peripherals or just having them enabled 
does
> not show a difference in power consumption of more than 5 mAs. In
> fact, running them caused the current to drop a couple mAs. The
> highest current we measured in characterization based on a core
> voltage of 1.8V was less than 60 mAs, only if the core voltage
> increases to the max. of 1.95V we saw single devices exceeding 60 
mAs. 
> 
> When we really disabled the peripherals using the PCONP register and
> leaving the VPB-divider at the initial divide by 4, we saw current
> consumption around 35 mAs running at 60 MHz without peripherals. 
> 
> The major difference is disabling the peripherals and / or the VPD
> divider for the peripheral bus. With the divider you can save 
approx.
> 10 mAs and with disabling them all approx. 15 mAs based on 60 MHz
> operation.
> 
> There are so many conditions but in general, the active power is
> highly dependend on your core voltage, highly dependend on your
> VPD-DIV, highly dependend on the settings in PCONP, MAM-enabled, PLL
> enabled.
> Less dependency but still some differences for single peripherals
> running or not, operating temperature.
> 
> Idle power depends mostly on the frequency provided to the
> peripherals, so VPBDIV and PCONP. Disabling the PLL also makes a
> significant difference. Recommendation disable PLL and set VPBDIV 
to 4
> while disableing unused peripherals in PCONP. Measured value used
> above recommendations at 10 MHz and all peripherals disabled was 2.3
> mAs, same conditions 20 MHz was 4.5 mAs. With PLL enabled and 
running
> the peripherals at max speed idel power can be around 20 mAs.
> 
> For power down current the most important factor is temperature! 
While
> most of our devices are around 10 uAs at room temp, they are >100 
uAs
> at 85C.
> 
> Let me apologize for the confusion. Will work hard to do better in 
the
> future!
> 
> btw. as a courtesy it would be nice to identify yourself by name. 
> 
> Robert
> 
> 
> --- In lpc2000@yahoogroups.com, "lp2000c" <lp2000c@e...> wrote:
> > 
> > The latest LPC2114 Data Sheet shows a Typical 1.8V current of 60 
mA 
> > (at 25 degrees, with no active peripherals).  This is double the 
> > value published in the previous "prleiminary" revision.
> > 
> > Philips Apss:
> > What is the Maximum current draw (including chip-to-chip 
variations, 
> > and temperature efffects?)
> > What is current draw with all peripherals active?