Lpc2000

I am working on 2148.  On it, Port 1 has pull Ups.  So if you drive Port
1 outputs low, you are fighting the pull-ups.  16 @ 60K is about 4K
equivalent or 1mA.  I think it is the same on the 2138.  

 

Let me know if this helps.  I am in design and am counting on the <100uA
number, too.

 

Dan

 

 

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From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf
Of david_albert@...
Sent: Tuesday, September 13, 2005 4:19 PM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Power Down Consumption

 

Hi, and thank you for your post.  I am working with the LPC2138 and am
having trouble reproducing the very low power consumption you achieved
and wonder if you could share your experience.  In particular, I have a
minimum parts count system (ARM, crystals, minimal caps, 100K BSL
pullup, 10K Reset Pullup, 10K TCK pulldown, and that's about it.  When
turning off all peripherals and placing the CPU in powerdown mode, I am
still seeing about 1mA of current consumed.  I've tried a number of
tricks on the GPIO including setting TCK and BSL as outputs and setting
them low (clear) so that there should be no/minimal power leaked through
the pull up/downs.  I have nothing connected to P1.16:31 except the
pulldown on TCK, so there should be little or no leakage through the
internal pullups.  Can you share how you configured your ARM to get the
sub-100uA consumption?  Thanks!

Regards,
Dave Albert



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