The mysterious LED5 on the nrf52840 DK: What does it indicate?

Hi,

Can you tell me what LED5 on the nrf52840 DK indicates?  When is it on?  When is it off?  2 observations I have made:

  1. When the DK is connected to a development computer USB port and it is running a flashed program, LED5 is on almost continuously with a very short off time about once a second - really close to being on continuously.
  2. When the DK is connected to a USB power port running the same flashed program, LED5 flashes rapidly.

It seems like this would be under control of the interface MCU software.

I think the development community would like a definitive answer on this.

Thanks,

Ken

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