sdk_config.h for synth LFCLK in nRF52

[kimyw0228]

Hi.

I want use the synthesized LFCLK.

But sdk_config.h has the 3 items about LF clock source

- NRFX_CLOCK_CONFIG_LF_SRC

- CLOCK_CONFIG_LF_SRC

- NRF_SDH_CLOCK_LF_SRC

Do I need to change everything to use a synthetic LFCLK?

Thanks in advance.

Env)

nRF52840 and nRF52832

SDK 15.2

Softdevice S140 and S132 6.1.1

[Eugene Yu]

Hello Mr. Kim,

May I ask you why do you need synthesized LFCLK ?

If you want to use LFCLK without external crystal, I recommend to use RCOSC.

The synthesized clock is generated from HFCLK. means that to use it you should enable the HFCLK.

It consume more power than others.

If you have not necessary reason for using synthesized clock, RCOSC is better choice without adding external components.

Please refer to this link.

[kimyw0228]

Hi Eugene Yu.

Thanks your answer.

The reason that using synthesized LFCLK is to remove external crystal.

I plan to use MDBT50Q module.

If I use the RCOSC, it may need the re-certification.

But I will consider your advice.

thanks.