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!
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!
HFXO would be required for UART to ensure reliable communication across temperature. I checked internally whether it would be possible to improve the clock accuracy with better calibration in production, but found that it would not. The only viable solution is to periodically calibrate HFINT against HFXO, which does not help in this case if you plan to not have an XO here
From the UARTE chapter of the datasheet:
The other serial interfaces with synchronous clocks should be fine with HFINT. The electrical specification for HFINT can be found in the datasheet here: https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/_tmp/nrf54l15/autodita/CLOCK/parameters.hfclk.html.
So what is the application?
Regards,
Jonathan
HFXO would be required for UART to ensure reliable communication across temperature. I checked internally whether it would be possible to improve the clock accuracy with better calibration in production, but found that it would not. The only viable solution is to periodically calibrate HFINT against HFXO, which does not help in this case if you plan to not have an XO here
From the UARTE chapter of the datasheet:
The other serial interfaces with synchronous clocks should be fine with HFINT. The electrical specification for HFINT can be found in the datasheet here: https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/_tmp/nrf54l15/autodita/CLOCK/parameters.hfclk.html.
So what is the application?
Regards,
Jonathan
