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Rockbox mail archiveSubject: Questions about LiIon charger circuit and power drainQuestions about LiIon charger circuit and power drain
From: Christi Alice Scarborough <christi_at_chiark.greenend.org.uk>
Date: Fri, 06 Aug 2004 09:08:06 +0100 Hi, I was thinking it would be nice to try to make the battery percentage for the V2/FM recorder a bit more accurate. Having had a look at the charger specifications, I have a couple of questions that are beyond my own hardware prodding ability. 1) The charger circuit has a PROG pin, which can be used to indicate charging progress in the constant voltage stage of LiOn charging. Is this wired up on the JB in such a way that V(PROG) is available to Rockbox? 2) What is the value of R(PROG) in the Jukebox? If I can find this out, then I can work out what current is being applied in the constant current stage of charging. 3) (Personal curiosity) If the circuit shuts down automatically, how come my JB remains hot when plugged into the mains? On a related note, how would I go about measuring the power consumption of the Jukebox under several different conditions (ie idle, backlight, disk access, playing, recording, radio)? I have a multimeter but nothing else, really. Oh, and while I'm here, my charger socket appears to be a bit up the creak, in that I can only get it to charge by using an elastic band to put the charger plug under tension so that it goes into the Jukebox at an angle. Is there an easy way to fix this? Thanks, Christi _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-08-06 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |