I would like to know VDD_RTC operation.
(1) Can I connect non rechargerble battery (with diode) to the VDD_RTC ?
ex. Coin Cell(non rechargerble) --> diode --> VDD_RTC
(2) Charger circuit is necessary in outside when I use rechargeable coin cell ?
If need its circuit, do you provide reference circuit to us ?
(3) When is the polarity of the VDD_RTC port switched from output to input?
Always the VDD_RTC is output when the VDD_IN power presents ?