Does Clock source has effect on Communication stability at different Operating temperatures

RE: Does Clock source has effect on Communication stability at different Operating temperatures

haakonsh — Wed, 15 Apr 2020 12:54:00 GMT

[quote user="Pradeep9848Baruva"]While Performing climate test at ambient temperature -20 Deg Celsius the ble dongle (nrf52832 SOC which acts as peripheral device) when tried to connect to mobile (which acts central device) which gets connect and disconnect very frequently without disconnect request from mobile even mobile is close to ble dongle. This behavior is not their when the ambient temperature is normal ( ~<0 to 25> Deg Cel).[/quote]

If you could gather a debug log from the nRF device and a sniffer trace of the failing communication that would help a lot.

[quote user="Pradeep9848Baruva"]In our application ble dongle is not battery powered and we don't have Power limitation, if we use only crystal oscillator as HF clock source will it work at all extreme temperatures i.e (-40 deg to 85 deg Celsius which is operating temperature range of nrf52832)[/quote]

Then at least the current workaround to run the HFXO continuously won't impact you.

RE: Does Clock source has effect on Communication stability at different Operating temperatures

Pradeep9848Baruva — Wed, 15 Apr 2020 12:10:14 GMT

[quote userid="13562" url="~/f/nordic-q-a/60138/does-clock-source-has-effect-on-communication-stability-at-different-operating-temperatures/244332"]Can you share some more information on this issue? [/quote]

While Performing climate test at ambient temperature -20 Deg Celsius the ble dongle (nrf52832 SOC which acts as peripheral device) when tried to connect to mobile (which acts central device) which gets connect and disconnect very frequently without disconnect request from mobile even mobile is close to ble dongle. This behavior is not their when the ambient temperature is normal ( ~<0 to 25> Deg Cel).

[quote userid="13562" url="~/f/nordic-q-a/60138/does-clock-source-has-effect-on-communication-stability-at-different-operating-temperatures/244332"]Can you rephrase this statement, I did not understand what you meant. Are you talking about the LFCLK or HFCLK?[/quote]

I meant only HFCLK

[quote userid="13562" url="~/f/nordic-q-a/60138/does-clock-source-has-effect-on-communication-stability-at-different-operating-temperatures/244332"]Well, any crystal oscillator will be more accurate than an internal RC oscillator, especially at temperature extremes.[/quote]

In our application ble dongle is not battery powered and we don't have Power limitation, if we use only crystal oscillator as HF clock source will it work at all extreme temperatures i.e (-40 deg to 85 deg Celsius which is operating temperature range of nrf52832)

RE: Does Clock source has effect on Communication stability at different Operating temperatures

haakonsh — Tue, 14 Apr 2020 07:34:20 GMT

[quote user=""]As we are performing climate tests for custom PCB based on Nordic nrf52832 SOC, in low temperature i.e -20 Deg C the communication is not stable.[/quote]

Can you share some more information on this issue?

[quote user=""]After verifying the HFCLKSTAT register the registering SRC is switching between RC and XTAL clock.[/quote]

Can you rephrase this statement, I did not understand what you meant. Are you talking about the LFCLK or HFCLK?

[quote user=""]will Clock source effect the communication stability in different temperatures?[/quote]

Well, any crystal oscillator will be more accurate than an internal RC oscillator, especially at temperature extremes.