by charles67 » Sat Apr 30, 2011 9:08 pm
Thank you guys for coming up with this really good information!
I do have a few questions, I am adding an RTC crystal and a .22F capacitor (instead of a coin cell) to my dockstar. I plan on connecting the cap to the 5v rail via 2 diodes in series (1n4001) which should have a cumulative voltage drop of 1.4v, thus charging the 5.5v .22F cap to 3.6v.
Is the RTC circuit tolerant of 3.6v?
Should I use a 3rd diode and drop it to 2.9?
EDIT: I just measured a new cr2032 coin cell, and it is 3.4v.
Thanks in advance,
Charles