Messages in this thread |  | | | Date | Wed, 14 Oct 2009 13:22:00 +0200 | | From | Pavel Machek <> | | Subject | Spitz battery questions |
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Hi!
I did some measurements of spitz battery subsystem; maybe they are useful for someone.
Unfortunately, concistent numbers are quite hard: longer/thinner cables mean lower voltage and also lower currents :-(. I get quite consistents 5V at power supply, but it goes down to 4.5..4.2V when it reaches zaurus behind ampermeter. (Is zaurus even able to charge battery properly from such low voltage?)
One big surprise was wlan CF card, eating +200mA when initialized.
I'm working on drivers/power/spitz_battery driver, and I'll need to know conversion between ADC readings and milivolts; does someone have those?
Does someone have better/more reliable/other power consumption numbers?
Pavel
Idle, charging, no backlight, linux 2.6.26: 200mA @ 4.8V bl 1: 310mA bl 10: 315mA bl 20 340mA bl 30: 390mA bl 40: 440mA bl 47: 445mA disk is spinning: +50mA find /: +200mA cat /dev/zero: +100mA make: +240mA
charging, powerdown: 380mA..440mA charging, ROM menu: 550mA D+M monitor, not charging: 170mA D+M monitor, half charging: 280mA D+M monitor, full charging: 480mA..550mA
Charging in ROM, 23:17: 260mA 23:21: 245mA 23:25: 230mA 23:34: 205mA 0:08: 100mA 0:29: 80mA, charger LED is off
Charging in ROM, from empty @ 8:35: 610mA 8:38: 555mA 8:45: 545mA 8:50: 540mA 9:01: 540mA 9:18: 530mA 9:36: 520mA 9:45: 505mA 9:51: 480mA 10:15: 365mA 10:48: 250mA 11:01: 225mA 11:31: 180mA 11:38: 170mA 12:48: 80mA, charger LED is off.
Measured @ li-ion battery. ROM <7mA Linux 2.6.26 suspend: 7.5mA, 10mA?! Linux 2.6.26, fully running, charger connected: 50uA :-( 100mA charge
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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