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CC2640R2F: Current consumption

Part Number: CC2640R2F

Our custom hardware design is required to have a very long battery life.  I have configured the 2640 BLE advertising interval to 10 seconds.  When measuring current consumption, there is a spike once per second.  The other hardware on board is definitely powered off.  The periodic task within the simple peripheral app is not enabled to run.  I'm at a loss as to what might be happening once per second and if there is a way to prevent it from running.