1919706_en-US

[#1]

FRDM-MCXN947 RTC

Hello,

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?

Board DesignDevelopment BoardMCXNPowerRe: FRDM-MCXN947 RTC

Hi,

Thank you so much for your interest in our products and for using our community.

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 Table 1. Power domain operating requirements section from UG10092 MCXNx4x Hardware Design Guide.

Additional documentation:

2.1.1 Power supply configuration section from UM12018 FRDM-MCXN947 Board User Manual.

Hope it helps you.

Have a nice day!