https://community.nxp.com/t5/MCX-Microcontrollers/FRDM-MCXN947-RTC/m-p/1919706#M1396 <P>Hello,</P><P>I'm working on my data logger with FRDM-MCXN947, and I'm going to use the RTC module available on the board to record the time. I would like to ask, is it necessary to connect an external battery (and if so how), in case the main power supply is not connected via usb-c?</P> Mon, 29 Jul 2024 18:36:04 GMT Doly02 2024-07-29T18:36:04Z https://community.nxp.com/t5/MCX-Microcontrollers/FRDM-MCXN947-RTC/m-p/1919706#M1396 <P>Hello,</P><P>I'm working on my data logger with FRDM-MCXN947, and I'm going to use the RTC module available on the board to record the time. I would like to ask, is it necessary to connect an external battery (and if so how), in case the main power supply is not connected via usb-c?</P> Mon, 29 Jul 2024 18:36:04 GMT https://community.nxp.com/t5/MCX-Microcontrollers/FRDM-MCXN947-RTC/m-p/1919706#M1396 Doly02 2024-07-29T18:36:04Z https://community.nxp.com/t5/MCX-Microcontrollers/FRDM-MCXN947-RTC/m-p/1919780#M1397 <P>Hi,</P> <P>Thank you so much for your interest in our products and for using our community.</P> <P>Yes, you need an external battery to maintain the count of the time record. You need to connect the battery on VDD_BAT according to the <EM>Table 1. Power domain operating requirements</EM>&nbsp;section from <A href="https://www.nxp.com/webapp/Download?colCode=UG10092" target="_blank" rel="noopener">UG10092 MCXNx4x Hardware Design Guide</A>.</P> <P>Additional documentation:</P> <P><EM>2.1.1 Power supply configuration</EM>&nbsp;section from <A href="https://www.nxp.com/webapp/Download?colCode=UM12018" target="_blank" rel="noopener">UM12018 FRDM-MCXN947 Board User Manual</A>.</P> <P>Hope it helps you.</P> <P>Have a nice day!</P> Mon, 29 Jul 2024 21:04:14 GMT https://community.nxp.com/t5/MCX-Microcontrollers/FRDM-MCXN947-RTC/m-p/1919780#M1397 _Leo_ 2024-07-29T21:04:14Z