External HFXO for non-radio nRF54L15 applications?

[Raul R]

Hello,

I see in the datasheet that the nRF54L15 has an internal 128Mhz clock.

For applications that do not utilize the BT radio on the nRF54L15, is the external crystal required, or can we fall back to the internal 128Mhz clock?

Thanks!

[PaKa]

As long as none of the other peripherals that require the XO are used then you can build applications with only the LFXO. Some of the peripherals,like the UART, does require that you have the XO. Check that the maximum error of the LFRC is inside your application requirements.