Query for 32 KHz XTAL

[Ritesh]

Hello Espressif Team,

Hope you are doing well and everything is going well from your end.

We have one query regarding 32 KHz XTAL which is being used into many ESP32 based design and we have also used from reference design into our product.

But I would like to know that what will happen if we remove that XTAL like will it create any issue into any hardware or software working functionality if we remove it? I believe it is mainly used for RTC Sleep and Wakeup Mechanism.

So, would you please check and confirm from your end regarding actual usage with dependencies if any for that XTAL?

[ESP_Sprite]

It is needed if you need stable (<5% drift) timekeeping in sleep modes where the 40MHz crystal is switched off (i.e. deep sleep), or if you need BT modem sleep.

[Ritesh]

It is needed if you need stable (<5% drift) timekeeping in sleep modes where the 40MHz crystal is switched off (i.e. deep sleep), or if you need BT modem sleep.

Hello ESP_Sprite.

Thanks for your prompt response.

So, Ultimately, It is used to get proper clock into mode of sleep modes. We can remove if we are not using any sleep mode. correct?

[ESP_Sprite]

Correct.

[Ritesh]

Correct.

Thanks ESP_Sprite for your help and support.

We will remove it and will let you know if any further query for the same.