LSI as RTC clock

jaroslaw23 · ‎2011-12-15

Posted on December 15, 2011 at 11:24

Hi ,

Is it possible to run RTC with 40khz LSI when power is off and CPU works on battery only?

#rtc #lsi

domen23 · ‎2011-12-15

Posted on December 15, 2011 at 12:50

7.2.8 RTC clock

... says LS

E

is in backup domain, and other clocks are not.

jaroslaw23 · ‎2011-12-15

Posted on December 15, 2011 at 15:11

Thanks, I miss it in manual.

balmukund66 · ‎2011-12-18

Posted on December 19, 2011 at 06:51

It is not Possible.As LSI uses internal RC Oscilator to generate clock.For this purpose Vcc is required.VBAT gives supply to only RTC block.