CC1311P3: Inbuilt crystal

Hi,

Please see Sections 9.12 and 8.17.3 of the CC1311P3 Datasheet: https://www.ti.com/lit/swrs255 for information on this.

You need an external 48 MHz crystal to operate the radio. The MCU/peripherals clock can use the internal 48 MHz RC Oscillator if required.

Some additional information:

• Sections 6 and 7 of SWRA640 (CC13xx/CC26xx Hardware Configuration and PCB Design Considerations): https://www.ti.com/lit/swra640

• SWRA495 (Crystal Oscillator and Crystal Selection for the CC26xx and CC13xx Family of Wireless MCUs): https://www.ti.com/lit/swra495

• The LP-CC1311P3 (SPRR488): https://www.ti.com/lit/zip/sprr488 reference design is the recommended configuration.

Regards,

Zack