Lpc2000

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?