Lpc2000

I am working on a design that uses an LPC2212 and need to have power 
consumption minimized. According to the datasheet, the 1.8V draws 
~10uA in sleep mode, but I'm seeing 40uA. The EVBA7 comes in at 5uA 
using same code. And worse, I'm not able to get the 3.3V draw under 
1.2mA(EVBA7 is 200uA.) It needs to be pretty much nil. I have turned 
off all peripheral power using  REG(SYSCON_PCONP) = 0x00000000; I 
have been able to reduce the 3.3V draw from 3.5mA by turning off the 
external memory controller and disconnecting the memory bus and 
debug port using PINSEL2. I've tried to set all peripheral functions 
to GPIO.  I don't think I'm driving anything else on the board with 
3.3V. I've pulled practically every load to check, but no dice. 
Any thoughts/ideas?
Thx

Is the JTAG enabled?  If so, maybe tie the gound end of the JTAG
enable resistor to a pin on the JTAG connector that will supply
ground only when the connector is present.  Then set the pins to
GPIO outputs of the proper voltage in software for when the JTAG
is not enabled.

Anyway, just a thought.

Regards
-Bill Knight
theARMPatch


On Wed, 06 Oct 2004 14:24:37 -0000, tynerae wrote:

I am working on a design that uses an LPC2212 and need to have power 
consumption minimized. According to the datasheet, the 1.8V draws 
~10uA in sleep mode, but I'm seeing 40uA. The EVBA7 comes in at 5uA 
using same code. And worse, I'm not able to get the 3.3V draw under 
1.2mA(EVBA7 is 200uA.) It needs to be pretty much nil. I have turned 
off all peripheral power using  REG(SYSCON_PCONP) = 0x00000000; I 
have been able to reduce the 3.3V draw from 3.5mA by turning off the 
external memory controller and disconnecting the memory bus and 
debug port using PINSEL2. I've tried to set all peripheral functions 
to GPIO.  I don't think I'm driving anything else on the board with 
3.3V. I've pulled practically every load to check, but no dice. 
Any thoughts/ideas?
Thx

I've tried removing the resistor on RTCK, but the difference in 
current draw was negligible. Thx for the thoughts.


--- In lpc2000@yahoogroups.com, "Bill Knight" <BillK@t...> wrote:
> Is the JTAG enabled?  If so, maybe tie the gound end of the JTAG
> enable resistor to a pin on the JTAG connector that will supply
> ground only when the connector is present.  Then set the pins to
> GPIO outputs of the proper voltage in software for when the JTAG
> is not enabled.
> 
> Anyway, just a thought.
> 
> Regards
> -Bill Knight
> theARMPatch
> 
> 
> On Wed, 06 Oct 2004 14:24:37 -0000, tynerae wrote:
> 
> I am working on a design that uses an LPC2212 and need to have 
power 
> consumption minimized. According to the datasheet, the 1.8V draws 
> ~10uA in sleep mode, but I'm seeing 40uA. The EVBA7 comes in at 
5uA 
> using same code. And worse, I'm not able to get the 3.3V draw 
under 
> 1.2mA(EVBA7 is 200uA.) It needs to be pretty much nil. I have 
turned 
> off all peripheral power using  REG(SYSCON_PCONP) = 0x00000000; I 
> have been able to reduce the 3.3V draw from 3.5mA by turning off 
the 
> external memory controller and disconnecting the memory bus and 
> debug port using PINSEL2. I've tried to set all peripheral 
functions 
> to GPIO.  I don't think I'm driving anything else on the board 
with 

> 3.3V. I've pulled practically every load to check, but no dice. 
> Any thoughts/ideas?
> Thx