Lpc2000

--- In lpc2000@yahoogroups.com, Owen Mooney <ojm@s...> wrote:
---snip ----

Owen,

when we designed the LPC2130 series we expected to see Ipd in the
neighborhood of 50 uAs. Unfortunately the first lot came out with an
average of 150 uAs and we were all p.....ed.
There were 2 minor changes to the latest rev "A" which is not in the
filed yet and now we are measuring the devices between 40 and 60 uAs.
This does not include the 15-20 uAs for Vbat as you pointed out
correctly. Also keep in mind that a current from Vbat will also be
drawn during active mode. The rev "A" will draw the same current from
Vbat no matter teh CPU is active or not. The first devices that you
would have right now draw much higher current while the CPU is running
proportional to bus activity.

Ipd is a very difficult value to specify in this process because small
changes in the process will move the point where the Ipd takes off
based on temperature from around 70 C to a temp close to 25C. In this
case Ipd goes up. 

If you look in different specifications also from competitors selling
highly integrated ARM chips, you will see a significant difference
between typical Ipd and max Ipd because of this big temperature effect.

Hope this little background information helps,

It's late here, good night, Robert


> Robert said then about 150uA. This was too much for a logger with a
10 year battery life on a Lithium.
> 
> So - I have just done a layout using a PIC ! 
> 
> Now I understand the latest run of chips is about 50uA. Quite some
difference, and worth while ripping the PIC out of the circuit and
putting in an LPC2132 
> 
> Please confirm. For an LPCLPC213x series microprocessor with 32768
Xtal running powern consumption is 50+18uA in Powerdown mode and when
I wake up from an external interupt I can read the current Xtal osc
value in the CTC register ?
> 
> If so I will rip out the PIC anbd use one of these - even if I have
to go to a C size cell.
> 
> What is the expected power consumptin of these devices in future
production runs? 
> 
> Owen Mooney 

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