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  • Case ID: 306872
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I want to know what any protocol need RTC feature.

keunsik

Dear

As i searching , I only can find out ANT protocol need to RTC feature.

nRF52840 support  BLE, BLE mesh, Zigbee, Thread  and so on.

Which do protocol need RTC feature? 

How about is Zephyr RTOS?

Hardware designer asked to me about this.

He maybe try to skip parts  if RTC feature do not need.

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  • +1

    Hi,

    Both the Zephyr RTOS and all the protocols you mention need the RTC, as that is used to keep track of time. This doe snot necessarily have an impact on the HW design though. The RTC is clocked by a 32.768 kHz oscillator, and that can optionally be an external 32.768 kHz crystal or an internal LFRC. There is no problem skipping the external crystal and relying on the LFRC. This will typically lead to slightly higher current consumption though, as radio protocols will need to take into account a higher clock drift (you can see the effect of this for Bluetooth in the online power profiler).

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  • +1

    Hi,

    Both the Zephyr RTOS and all the protocols you mention need the RTC, as that is used to keep track of time. This doe snot necessarily have an impact on the HW design though. The RTC is clocked by a 32.768 kHz oscillator, and that can optionally be an external 32.768 kHz crystal or an internal LFRC. There is no problem skipping the external crystal and relying on the LFRC. This will typically lead to slightly higher current consumption though, as radio protocols will need to take into account a higher clock drift (you can see the effect of this for Bluetooth in the online power profiler).

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