On Jan 10, 2008 2:57 PM, Shawn Rutledge <[EMAIL PROTECTED]> wrote: > Yeah. I wonder if the battery has deteriorated somehow (from the > phone running and being plugged in to USB for days or weeks at a time, > and being overcharged? but the power management chip should not > overcharge it, right?), or maybe it is not being fully charged. I > consider it fully charged when it has been running, and plugged in to > USB, overnight. I'm also wondering if my hub may be limiting it to > less than 500 mA though. I need to measure the currents... both > battery current and USB current, in various states.
Well I made a sort of "current probe" by gluing two pieces of very thin single-sided PCB material back-to-back (the result is thinner than any double-sided stuff I have at home). I see -375mA (current coming out of the battery) as the usual load. But when USB is plugged in, I see between -60 and -80 mA - current is still coming out of the battery. So it's not getting charged; my hub must be limiting the current. Let me plug in directly to my PC... OK now it's +25-+45mA, still fluctuating all over but charging the battery slowly. I checked and it is in fast_cccv mode. So I guess that means the USB current is probably 400mA or less... we have a load of 375mA plus some charge current is going into the battery, but the charge happens at a different voltage, but there is some loss in the charge circuit too. Now I unplug USB for a second and it goes to 450mA load current (coming out of the battery to run the phone). OK 375 was lower than normal for some reason... So far that was running gllin, and logging data points, with the LCD and backlight on and showing the splash screen, but not running the UI. Not sure if GSM is on in that state or not. OK I will try it with a SIM installed, and running the UI... BTW current discharge is about 8-12 mA with the phone turned off. It's dropping a little over time. While the UI starts up the battery is still discharging. Now that it's sitting at the main screen the current is about +35-+40mA, charging the battery. Well it's not receiving a call. /sys/devices/platform/s3c2410-i2c/i2c-adapter/i2c-0/0-0008/chgcur fluctuates a lot too, from 693-2026 as I checked several times. Tried unplugging USB again to see the load current (coming out of the battery when it's not charging); that is still 450mA. But when I plug it back in, USB is misbehaving: usb 2-1.1: khubd timed out on ep0in len=0/64 usb 2-1.1: khubd timed out on ep0in len=0/64 usb 2-1.1: device descriptor read/64, error -110 usb 2-1.1: khubd timed out on ep0in len=0/64 and the battery current is -350mA (because it's taking 100mA from USB by default, right). _______________________________________________ OpenMoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
