Messure battery Vdd CYBLE-012011-00 internally, no pin wasting

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ToPh_1104671
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The Module have a dedicated VREF pad, but I guess it's only for bypass cap use?

   

If I import a battery monitor example it wastes a pin, example P3.3 that it calls Vref.

   

What is the difference between VREF and Vref?

   

I have access to LDO 3.3V voltage, would this help getting around wasting a pin?
​The 0.03Vdrop LDO is for a subsystem, so I do plan to run the BLE directly from li-po battery
and have it turn off the ldo when subsystem is sleeping.

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