RAM retention fail when changing the supply voltage

RE: RAM retention fail when changing the supply voltage

Turnaev — Thu, 22 Aug 2019 11:21:56 GMT

It is very bad... Ok

Thanks for the help!

RE: RAM retention fail when changing the supply voltage

Kenneth — Thu, 22 Aug 2019 11:02:51 GMT

Hi,

If you have a step up in supply voltage of >300mV in <300ms, then you may experience the internal power on reset circuit to trigger yes. In such case you can find the following description on how the chip will behave:
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=3_1_0_17_7#unique_832471788

'x' means: "Note: The RAM is never reset, but depending on reset source, RAM content may be corrupted."

Best regards,
Kenneth

RE: RAM retention fail when changing the supply voltage

Turnaev — Wed, 21 Aug 2019 20:22:06 GMT

Yes it could be. But why is the contents of RAM damaged.

I use uninitialized sections of memory for my purposes, and they get corrupted in doing so.

RE: RAM retention fail when changing the supply voltage

Turbo J — Wed, 21 Aug 2019 20:06:41 GMT

Might be power-on reset because of the increase in voltage on the VCC rail:

"A step increase in supply voltage of 300 mV or more, with rise time of 300 ms or less, within the valid supply range, may result in a system reset." (quoted from the Power-On Reset chapter in the PS).