VBUS wakeup behaviour - Also wake upon USB removal?

[GPL]

Hello,

During testing we found that whenever in system off mode, the CPU wakes from VBUS rising. As expected. We then do a vibration to notify the user the USB cable was inserted, and go back to system off mode after that. Now when we remove the usb cable again, the cpu is woken again. With RESETREAS indicating that VBUS was the single cause. We clear the reset reason register after each boot with

nrf_power_resetreas_clear(nrf_power_resetreas_get());

Is this expected behavior? And if so, is there any way to see which reason it was, removal or insertion? Currently I quickly tried this check NRF_POWER->USBREGSTATUS == 3 But that doesn't seem to work.

We use the power management module and we use the nRF52840. Our device is battery powered trough VDDH. VBUS powers a charging IC which feeds into VBAT which is connected to VDDH. We use DCDC mode on both regulators. The chip variant is QI-AAD0. 

[Turbo J]

Try scoping VBus / VDDH on the NRF side.

Just yanking the plug can cause voltage fluctuations - there is intentionally not much capacity on VBUS.

It may look a bit like this: ¯¯\/\/\/\___ , and thoses spikes may be well within VBus,Detect range, triggering RESET.

[GPL]

Unfortunately I cannot scope VBUS at the moment. I did place decoupling capacitors according to the reference circuitry in the datasheet. However, I was able to detect if the wake-up was a remove or insert by checking 

NRF_POWER->USBREGSTATUS > 0

This is enough for my application, and I should have checked that before posting this question. My apologies.