Deep power down RTC wake up issue

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Feb 7, 2017 by Daniel Toma
Content originally posted in LPCWare by henna on Sun May 31 19:10:08 MST 2015

I am working on the similar project and I face the same issue. I am trying to put my LPC4357 into Deep power down mode and I am not able to wake up from RTC alarm event interrupt.

However I am able to wake up from wake up 0 event interrupt.

To make sure RTC alarm is triggered I am putting ON one LED in the interrupt.the VBAT pin stays at 3.3V all the time and I put debug to check if RTC is enabling or not, everything works fine but, if I put my 4357 in deep power down mode and choose to wake up from RTC alarm event interrupt I loose the control of debug( which is expected) but by I never get RTC alarm interrupt.

I suspect RTC is not working( or is not getting power) as expected in deep power down mode.

Can anyone tell what I am doing wrong or any help about how to check power of RTC domain once the core is deep power down.

Any help will be appreciated.