52810 PWM frequence offset

RE: 52810 PWM frequence offset

Kazi Afroza Sultana — Tue, 10 Oct 2023 12:05:49 GMT

Hello,

The difference of offset frequency betwee nRF52832 and nRF52810 lie on chip-to-chip variation of the clock accuracy. The HFINT has up to +/- 6% frequency tolerance https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/clock.html?cp=5_2_0_18_3_0#unique_641326801).

And for nRF52810, it is +/-8% (https://infocenter.nordicsemi.com/topic/ps_nrf52810/clock.html?cp=5_5_0_4_3_3_0#unique_346563525).

If you want to get better accuracy, you have to use HFXO.

RE: 52810 PWM frequence offset

Victor A — Mon, 09 Oct 2023 09:33:22 GMT

Thanks for your answer.

And I want to know why the clock precision of 52832 is better than that of 52810.

We are mass produced. we found all of the 52810 PCBA have this problem, while the 52832 does not have this problem.(only different with the nordic chip)

RE: 52810 PWM frequence offset

Turbo J — Sun, 08 Oct 2023 09:26:07 GMT

Read the PS!

The HFINT clock is an RC oscillator, which are not nearly as precise as one base on a crystal.

The expected range (f_TOL_HFINT) - which differs on individual chips - is even larger.