nRF5340 internal capacitance accuracy

[zero]

Dear Support Team,
What is the accuracy of the internal capacitance of nRF5340?
The datasheet and devzone didn't find the answer.

[Kazi Afroza Sultana]

Hello,

I have asked our team. I will reply you when I will get the feedback.

Thanks.

Best Regards,

Kazi Afroza Sultana

[zero]

Hi，

Thanks for the support!

Best Regards,

Zero

[Kazi Afroza Sultana]

Hello Zero,

Which capacitance and peripheral you are talking about?

You can look at this section https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/oscillators/doc/oscillators.html?cp=3_0_0_3_11_3_2#register.XOSC32KI.INTCAP which is about internal capacitor. 

Thanks.

Best Regards,

Kazi Afroza Sultana

[zero]

Hi Kazi Afroza Sultana

What is the accuracy of the internal capacitance to connect a 32MHz external crystal?

Best Regards,

Zero

[Kazi Afroza Sultana]

Hello Zero,

We do not have any specific value of accuracy of the internal capacitance.

According to our IC expat , With the uncalibrated values of internal oscillators can have accuracy of +/-15% across full PVT (process, voltage and temperature).  But following the guidelines described in section 4.12.1.1 (Using internal capacitors) of the product specification, it can be improved up to +\-5%.  you can find exact capvalue ( internal capacitance should be in between 7.0 pF and 20.0 pf in 0.5 pf steps). Then you would get accuracy approx <+/- 5%. 

Internal load capacitors for the 32MHz crystal oscillator are designed to meet the following frequency tolerance requirements https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/oscillators/doc/oscillators.html?cp=3_0_0_3_11_0_0#concept_internal_caps :

Thanks.

Best Regards,

Kazi Afroza Sultana