Lpc2000

Well,

The only components that i have connected besides the processor are the 
reset circuitry (1 cap, 1 diode and 1 resistor), the RS232 driver 
(MAX3238), the regulator (MCP1701), the USB circuitry (now with 2 470K 
pulldown in the D+ and D- lines) , the crystal and pullups in 3 P0 pins.
Without the processor, the board consumes less de 2uA.



Steve Franks wrote:
> > Message: 22       
> >    Date: Tue, 06 Dec 2005 16:56:45 -0200
> >    From: Mauricio Scaff <scaffm@...>
> > Subject: Re: Re: Still need help...
> >
> > No, they are all pulled up or are outputs (outputting 0 in
> > port0 and 1
> > in port1).
>
> If there is a path (impedance) from your pulled-up pins to ground, 
> that can
> suck power out the pullups - I've done it before.  Look very closely 
> at the
> leakage of things on the other end of the pin - some fet's I've used have
> bad leakage specs - each sucks some number of uA from your pullup, you get
> in trouble fast.  Since most devices have fet-inputs (being made of cmos)
> you can get in trouble quickly.  Lots of devices (i.e. LDO regulators) 
> used
> to have really bad specs on their shutdown current too - I made a 
> board with
> some accelerometers that had to have pfets on their power-supply pins, 
> even
> thought they supposedly had disable capability - the spec'd 100uA of 
> disable
> current was eating most of my power budget!
>
> Best,
> Steve
>
> Steve Franks, KE7BTE
> Electrical & Firmware Engineer
> Tucson Embedded Systems
> (520) 575-7283 x171
>
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