Dear DLG expert,

On DA14581, we are trying to use internal RC oscillator to achieve relatively long connection interval (2s), is it possible at all?

We've tried using 500ppm SCA configuration but still found BLE connection stability issue with 2s connection interval (we understand that the spec from DLG says 500ppm if wake up period is 1s). After trolling some docs, we've got the following idea and can you please help us to validate if it is doable?

In stead of purely relying on BLE wake up event (for Rx & Tx), we schedule an additional wake up event which performs RCX 32K calibration only (using system provided function which measures the gap between 32K and 16M). In the additional wake up, the next wake up cycle (for BLE rx &Tx) is recalculated and scheduled. This hopefully can achieve more accurate wake up timing, hence can help improve connection stability.

Just wonder if the idea is plausible or not? If yes, can you please point out what should be done to make it happen?

Thanks in advance,
uta_lc