skypi
Posts: 111
Joined: Sat Aug 09, 2014 11:48 pm

Ah! So the problem with adding a real-time-clock to the board would be need for a battery.....

Sat Apr 07, 2018 8:39 pm

Ah! So the problem with adding a real-time-clock to the board would be need for a battery.....

so got that space problem anyway so those Chinese 3231? boards with small battery not far off as small as can feasibly get... without a miniature steam engine on board LOL

(haven't IBM already made nano tech steam engine size of a pinhead? what use is that you might say? generating electricity, like sure those clock circuits will run at 1.8v now if not much less... that is to say, you have a few very hot chips on the board will create steam at the right scale/proximity as a layer of the cooling mechanism.... or at least generate expansion of a cooling fluid to drive a turbine perhaps... try to achieve as close to perpetual motion as possible eh! not from the crap stuff generates requirement for fixes end of the scale.... rather the other end of scale... free energy deprives the morgans/rockefellers/rothschilds etc. of a permanent take on 'utility' bills eh!)

W. H. Heydt
Posts: 10998
Joined: Fri Mar 09, 2012 7:36 pm
Location: Vallejo, CA (US)

Re: Ah! So the problem with adding a real-time-clock to the board would be need for a battery.....

Sat Apr 07, 2018 10:19 pm

When you have hot chips, there is no problem because power is being supplied to board and the RTC can tap that. The battery is to cover the times when there is no external power. There is an RTC module available that uses a supercapacitor instead of a battery, but it will only run the RTC for a couple of days of no power.

A real solution would be for the RTC circuitry to be integrated as part of the SoC and have a header on the board to attach a battery (that's the way to Odroid C1 is set up). The battery holder could be part of, or fastened to, a case. But don't hold your breathe waiting for that to happen. In the mean time, a possible solution would be to add an RTC and battery holder to the PoE HAT.

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