When I issue the sleep command with "echo -n "mem" > /sys/power/state" it effectively goes from 0.150A -> 0.025A.
I tested this with a BBB with only the debug serial cable attached to it and a 3.14-ti kernel. Which kernel version are you using? Regards, Adrian On 6 October 2014 15:58, Mikko Pakarinen <[email protected]> wrote: > Hi > > My aim is to build low power(battery powered) 3G surveillance camera based > on Beagle Bone(or black) and I have done some research regarding power > management of BB and those attentions goes for BBB too: > > Using prebuild image included in AM335xSDK 07_00_00_00( > http://software-dl.ti.com/sitara_linux/esd/AM335xSDK/latest/index_FDS.html) > I can put BB in deep sleep giving command > > echo -n "mem" > /sys/power/state > > After that current draw goes from ~210mA -> 150mA and BB wakes hapily up > when I type any characters to console via USB-OTG > > TI announces that power consumpion of AM335x is in deep sleep about 1mA so > something is consuming current and I guess those are usb-circuits and > lan-circuits at least. According BB RevA6 schematic lan and usb are powered > via rail VDD_3V3B so I enhtusiastically command PMIC with > > i2cset -f -y 0 0x24 0x0b 0x6b; i2cset -f -y 0 0x24 0x16 0x1f; > > which turns rail VDD_3V3B off BUT unhapily also affects system reset, > because U14B in schematic is powered via VDD_3V3B! In BBB if I have > understand the schematic right, both VDD_3V3B and VDD_3V3A tied together via > PMIC and regulators enable-pin so both rails are on or off. > > after issuing command > > i2cset -f -y 0 0x24 0x0b 0x6b; i2cset -f -y 0 0x24 0x16 0x00 > > current consumpition is zero, so there is no quiescent current, which PMIC > has no control(you can guess that White Bone is really black after that > command :D ) > > So the after this scrambling I ask: is there something I have missed if I > want to put BB or BBB deep sleep state with minimal power consumption and > wake it up hapily with GPIO(this needs some config?) or it is overall > possible with current schematics and if not is there coming new version of > BBB where it is possible disable all unnecessary leak currents? > > Thanks for your interest, > Mikko Pakarinen > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
