LPC MicrocontrollersのトピックRe: LPC55S16 - RAM backup

LPC55S16 - RAM backup

istvanmate — Fri, 03 Dec 2021 03:04:30 GMT

Is there a way to keep the RAM or some portion of it alive with a backup battery on the LPC55xx micro?

ZhangJennie — Fri, 03 Dec 2021 14:52:21 GMT

Power Domain “Always On” includes PMC(Power management controller) and RTC.

This domain always has power as long as sufficient voltage is available on VBAT ([1.8 V –3.6 V]), that is external battery.

See below pic. "Always On " domain is in red. While RAM is not controlled by "Always On " domain. So we can't keep RAM with VBAT only.

Have a nice day,

Jun Zhang

istvanmate — Sat, 04 Dec 2021 00:20:03 GMT

Thanks for the quick reply.

It is what it is. I'll have to use external means to keep data alive between power cycles.

ZhangJennie — Mon, 06 Dec 2021 03:34:33 GMT

You are welcome.