Third party NFC chip is woken up by BLE adv.

[Gary Gu]

Hello,

We are using nRF52832 to develop a door lock controller. As nRF52832 cannot work as NFC master, we use another chip to read M1 cards. Everything goes well, except that the NFC chip is occasionally woken up if BLE adv is enabled. Not sure if this caused by radio signal interference or hardware design faults. Is there any clue? or any guidelines for such dual radio (BLE/NFC) design?

Thank you!

[ketiljo]

Can you turn off the wake up on the NFC chip? If it's a reader only, there's no reason for it to wake up on field. 

[Gary Gu]

Sorry I did not make it every clear about the "wake up" feature. The NFC chip is normally in a Low Power Card Detect (LPCD) mode. It will trigger an interrupt to wake up nRF52832 to do card reading, when a card comes into the field. So this is a feature by design, we cannot turn it off. It is observed the interrupt is triggered occasionally without any card in field, when BLE adv is turned on.

[ketiljo]

It could be be something with the design of the NFC chip. You should reach out to the manufacturer of this chip and ask them.