LPC55S16 - RAM backup

[istvanmate]

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

[ZhangJennie]

Hi

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]

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]

You are welcome.