Hi Michael, I want to ask you if you have tested this backup system with a supercap. I thought that it's the better solution to keep your SD card without corruption, but I'm not sure if TPS65217 works fine with a supercap instead of Lithio battery.
Could you tell me if it's works fine? Do you use a 10k termistor? What kind of supercap do you use? Thank you in advance. 2012/9/19 Dr. Michael J. Chudobiak <[email protected]> > Your 1 F cap, charged to 4.2 V, only has about 2.45 mWh (if my math is >> correct) of energy. Assuming that the "Kernel Booting (Peak)" current >> consumption measurement is roughly right in the bone SRM (rough worst >> case), that's about 0.485 mWh energy consumed per second, leading to >> only a few seconds of run time from the 1 F cap. >> > > At some point, I'll give it a test and see what happens... > > > > My use case (maybe yours, too?) is that our customers' normal way of >> shutting down will simply be to pull the power cord out and wait for the >> LEDs to turn off. When the power cord is reinserted, it powers back up. >> > > We have a deluxe approach with a power switch, rather than yanking the > cord :-) > > But yes, power removal is the basic way of shutting down the system. > > > I'm thinking a comparator-like circuit on the prime DC power to my system > (+24V), which should buy a few hundreds of ms before the +5V starts to fail. > > > - Mike > > -- > > > -- 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/groups/opt_out.
