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CC1310: 32.768kHz crystals and its loading cap

Part Number: CC1310

Hi,

I'm looking for correct P/N of the 32.768Khz crystal for CC1310 design and was confused by different descriptions on TI spec. and design files, would anyone clarify that:

1) load capacitance should always between 6pF ~12pF.

2) FC-12M: 12.5pF in the AN and C51:15pF load capacitance on LaunchPad are incorrect?

TI's Spec

Application Report: Crystal Oscillator and Crystal Selection for the CC26xx and CC13xx Family of Wireless MCUs

TI's Launchxl-CC1310_schematic.pdf

thanks!