Paul, > It's possible with bq27k because it works autonomously. But if you do > something similar to gta01 there's no way to measure current in > suspend without an external equipment.
Can't you measure current before and after suspend, and knowing how long you were in suspend calculate energy consumption during suspend? Wolfgang On Sun, Aug 02, 2009 at 11:46:06PM +0400, Paul Fertser wrote: > Wolfgang Spraul <wolfg...@qi-hardware.com> writes: > >> Yes, i think that's the case. The only state where integrated power > >> measurement > >> readings are unavailable is suspend and that's quite low level > >> already. > > > > You could measure the current when you wake up, couldn't you? > > It's possible with bq27k because it works autonomously. But if you do > something similar to gta01 there's no way to measure current in > suspend without an external equipment. > > >> bq27000 measures current accurately so it should be possible. I'm sure > >> there's some decent IC suitable for your task. > > > > bq27000 is a chip, right? You mean we should have that chip inside the > > device, > > instead of having it in every battery? > > It would be a possible solution but it doesn't make much sense because > bq27k assumes it's connected to the same battery all the time. I meant > that since bq27k manages to measure the current accurately, there > should exist some other more simple IC (properly shielded to be immune > to noise) to measure the current inside a device. Also the charger IC > must know the current too, it's just that PCF50633 doesn't allow to > read it for some reason :( > > There's also a possibility to use some other CC on device side, take > a look at http://focus.ti.com/docs/prod/folders/print/bq27510-g1.html > ( $1.6 ) > > > That would make the batteries cheaper as well, I believe the CC batteries > > cost 2 USD or so more than without CC :-( > > And also special batteries are always harder to source for > end-users. Especially if they're not located in EU or the USA. > > -- > Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software! > mailto:fercer...@gmail.com _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
