Do I need to provide external CL capacitors connected to the MAX32660?
No, external capacitors are not needed on the 32KIN and 32KOUT pins. The 32KIN and 32KOUT pins have an internal capacitance of 6pF each. Therefore, only a 32.768kHz crystal (XTAL) should be connected to these pins. The characteristics of the crystal should be CL=6pF, Co=2pF, and an maximum effective series resistance (ESR) of 90kohms.
