nRF52840 with device protection

[QuentinD]

Hello,

Currently we use nRF52840 in some of our products. These devices are programmed with a project inspired by nRF5_SDK_for_Thread_and_Zigbee_v4.1.0

I will have to order BT840-P (nRF52840 with AP Protect security feature).

My questions are:
- If I program these BT840-P with my current project, do I risk having a problem?
- My devices also have the Nordic bootloader so that we can update the devices with UART: will using a BT840-P impact the UART update?

Thank you

[Einar Thorsrud]

Hi,

- If I program these BT840-P with my current project, do I risk having a problem?

nRF5_SDK_for_Thread_and_Zigbee_v4.1.0 comes with an older MDK that does not support revision 3 of nRF52840, which is the revision with the improved access port protection feature. Therefore, the old firmware must be re-built with a newer MDK (at least version 8.40.2, but I would recommend you pick the latest version). See IN141 for details.

- My devices also have the Nordic bootloader so that we can update the devices with UART: will using a BT840-P impact the UART update?

None of the errata workarounds will be enabled in the bootloader unless you re-build it with an updated MDK, so this is the same as for the application. I would not expect that this would cause breaking issues with the bootloader, but it would make change to also rebuild the bootloader with an updated MDK, just as you should with the application.