HFXO does not work on nRF52832

[silvio3105]

Hi,

I cannot start HFXO on nRF52832. I'm using 32MHz crystal TSX-3225 32.0000MF20X-W0(from Mouser) wtih 12pF caps UMK105CG120JV-F(also from Mouser).

Checked with beeper on multimeter, no shorts between pins and between pin and GND.

Looks ok on MCU pin side(QFN package).

This is code

int main(void)

{

    NRF_LOG_INIT(NULL);

    NRF_LOG_DEFAULT_BACKENDS_INIT();

    NRF_CLOCK->TASKS_HFCLKSTART = 1;

    while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);    

And PCB

I'm out of ideas.

[silvio3105]

https://docs.nordicsemi.com/bundle/ps_nrf52832/page/clock.html#d910e8036

Here it says 4pF.
I will contact Epson about this crystal.

[silvio3105]

The problem is fixed. HFXO caps are 8pF.

I could not get advertise to start so I decided to move component by component from one PCB to another. I moved MCU + VDD caps, HFXO + caps and ANT.

I did not know DEC1, DEC3 and DEC4 are needed for MCU to work properly. I thought they are needed for DC/DC setup. My bad.