Hi folks, You also have to watch pull-up resistors. I drive mine from a spare pin instead of 3.3V, so only turn them on when testing a relevant input.
Garst Steve Underwood wrote: > > Hi Kelly, > > The MSP430 usually runs as low as about 1.2V at 1MHz. At 1.4V is is rock > solid, which is why the brownout reset operates at 1.4V. That said, if > you are in LPM3 or LPM4 neither the CPU or the 1MHz clock is running, so > they consume essentially no power. The usual reason for the type of > problem you see is that you have not turned off some power hungry > peripheral before entering the low power state. The ADC or its voltage > reference would be good candidates. Perhaps they just give up and stop > consuming below 1.6V, so you see a change there. I am not sure. High > consumption through some port pin is another possibility. > > Good thing: The MSP430 peripherals have a *lot* of options you can choose. > Bad thing: The MSP430 peripherals have a *lot* of options you can > choose. :-) > > There are a lot of registers to check through and get just right to > achieve the best results in low power mode. You should be running at > around 1uA if everything is right. If you have everything set up > correctly you *will* achieve that current. You really need to measure > your current consumption as you go into low power mode. A lot of strange > things often occur, taking short bursts (a few seconds) of significant > current as all the voltages from all mains powered circuitry interfaced > to the MSP430 dies away (e.g. I/O pins slowly dropping through the > switching region of their inputs consume over 100uA each). > > Regards, > Steve > > Kelly Murray wrote: > > > Mclk is 1Mhz, Aclk is 32khz, as I said, it DOES turn the power back on > > when I provide changed input. I've confirmed it's caused by the MSP > > since > > I changed the watchdog interval from 1 to 4 seconds, and it then takes > > 4 seconds > > to wake up instead of 1. > > nobo...@web.de wrote: > > > >> Hi, > >> > >> > >> > >>> I think the specs say 1.8v. However, it does still seem to be > >>> running, because it is still monitoring > >>> the input and turns the power back on. > >> > >> > >> at 1.8 V the MC hangs with more than 4.15 MHz clock. > >> You should check that. > >> > >> Rolf > > > > ------------------------------------------------------- > This SF.Net email is sponsored by: Oracle 10g > Get certified on the hottest thing ever to hit the market... Oracle 10g. > Take an Oracle 10g class now, and we'll give you the exam FREE. > http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click > _______________________________________________ > Mspgcc-users mailing list > Mspgcc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mspgcc-users
