Impact of different oscillator capacitors

[Avi]

A manufacturer of nrf52832 module has replaced by mistake the values of C1.C2 capacitors that are connected to the 32Mhz oscillator from 12pf to 24pf and 27pf.

What will happen? 

[Dmitry]

Probably the frequency offset of your crystal will be beyond +-40ppm, and your module won't pass certification tests, maybe even won't be able to connect to other devices.

[Avi]

Thanks

What will happen if the capacitors were 15pf and 15pf?

[Simonr]

Hi Avi

Crystal load capacitors are determined by the following formula: C1 = C2 = 2* C_L - 4 pF, where C_L is specific for the crystal (The load capacitance should be stated in the crystal's datasheet). Straying from this value will likely lead to a frequency offset like what Dmitry explained. Small changes if these capacitors' values aren't available (to 15pF) should be fine, but we can't guarantee that it will pass certification in that case, and we strongly suggest to use the suggested capacitor values.

Best regards,

Simon