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The SIP Module includes a standard 24MHz Pierce oscillator (handles System/RF)
The module also supports an external 32KHz LPO Oscillator
Since the internal LPO runs at 128KHz, one would expect higher dynamic power.
External Oscillator therefore in theory = Better sleep clock accuracy & lower sleep current of about 20% rough estimate the developers provided me during discussion, but never measured)
The theory is that the Ext Osc is utilized when increased sleep clock accuracy (PPM) is needed. Recall that as part of the connection event, the master and slave exchange sleep clock accuracy (PPM) and the accuracy is used to determine the uncertainty window of the slave device for the duration of the connection event. This means that more accurate clocks can actually save power.
As mentioned previously, we are working both internally and with Partners to develop some boards which will address our lack of a good power measurement platform (and associated profile/application as this peice is every bit as important since Bluetooth is so configurable). We should have something announced in the community soon.