Hello Stefan,
From the developers:
1. Yes, you should see power consumption improvement using the external oscillator.
2. We have not run the power consumption tests with the external oscillator at 1.7V.
3. The external oscillator does not have any effect on the Crystal Warm-Up Issue
4. In sleep we turn off the Internal LPO.
5. Since the use of the External LPO is more accurate you will see a power savings
6. For longer connections it will be more accurate and better power savings.
7. You should see sleep current drop between 5 to 6 uA if you used an External LPO.
Thanks,
JT
