rtc power supply microcontroller interfacing | Microcontroller › 8051 › rtc power supply microcontroller interfacing This topic has 1 reply, 2 voices, and was last updated 10 years, 9 months ago by AJISH ALFRED. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts June 17, 2013 at 10:05 am #2488 Sachin D PuriParticipant AJISH ALFREDParticipant Hi, You should supply the RTC chip with the voltage mentioned in its datasheet. If it works on 3.3V then you should supply atleast 3V, if it is 5V then you have to supply atleast 4.5V Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In