I am using an RTC for other purposes that exposes a buffered 32kHz clock. I am considering using the buffered (rail-to-rail) for also the LF timebase of the nRF51. The drive current when using crystal oscillator is ~1uA.
Do we still consume this current if a rail-rail clock is applied to XL1 or does internal AGC reduce current drive?
For calculating capacitive losses with rail-to-rail drive is 4pF input correct assumption?
P_XIN = 1/2 * C * V^2 * 32.767kHz = 1/2 * 4pF * 3V^2 *32.768kHz
