LPC51U68 RTC backup

[br1]

LPC51U68 has RTC but DON'T have battery backup pin (something like VBAT) ? How is it possible to backup the RTC?

[FelipeGarcia]

Hi,

As you mentioned the LPC51U68 does not have a straightforward method to backup the RTC. The RTC module and the oscillator that drives it, run directly from device power pins. This means you will need to use some external circuitry such as a schottky diode.

Best regards,

Felipe