difference between internal oscillators and external oscillators

[LongQi]

what is the difference between internal oscillators and external oscillators for nRF52833? 

What the functions are affected? can share more details so we can choose proper oscillator? 

[Sigurd Hellesvik]

Hi,

See https://infocenter.nordicsemi.com/topic/ps_nrf52833/clock.html?cp=5_1_0_4_3

Does this answer your questions?

Regards,
Sigurd Hellesvik

[Eric_Xnergy]

Hi,

I want to check whether both of the HF and LF osc can use internal osc? If both are used internal ones, is there any function be affected (like will have lower accuracy or higher lost rate for communication or any function cannot be used with internal osc)?  

[Sigurd Hellesvik]

Eric_Xnergy said:

any function cannot be used with internal

The radio needs an external HF clock, which is why we have a crystal for the HF clock in all our reference designs.

Eric_Xnergy said:

like will have lower accuracy

Yes, this is the main drawback of internal oscillators, so if you need high accuracy with some peripherals, you may need external clocks.

For the LF clock, you can also calibrate the internal one from the HF clock, which can give the internal LF clock some more accuracy.

Other than this, I recommend that you search a bit on DevZone to read tickets discussing external and internal clocks, to get an overview.
For example HF and LF clock for nrf52840 .

Does this answer your question?