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ESP8684 RTC memory
Posted: Sun Nov 27, 2022 8:42 pm
by timmbo
Hi all,
just a quick questions regarding the ESP8684H2: Does the chip have any onboard RTC memory (i.e., can memory be retained after deep sleeps)?
Thanks & Best
Re: ESP8684 RTC memory
Posted: Mon Nov 28, 2022 12:42 am
by ESP_Sprite
It doesn't have dedicated memory for this. Closest you could get to this is to store data in main memory and only use light sleep. Alternatively, the ESP8685 (from the ESP32-C3 family) has 8KiB of RTC memory; you could switch to that.
Re: ESP8684 RTC memory
Posted: Mon Nov 28, 2022 7:58 am
by timmbo
Thanks a lot for your answer. This is quite a surprise, making the chip basically not usable for battery operation. Are you sure on that? On
https://products.espressif.com/#/product-comparison
it says the ESP8684 has RTC SRAM of 8 KB?
Best
Re: ESP8684 RTC memory
Posted: Tue Nov 29, 2022 2:33 am
by ESP_Sprite
Thanks for noticing that, that's a bug in the product comparison thing. I'll file an issue to have that looked after. The 8684 still is usable for battery operations; you'd have to save any state you'd want to save elsewhere (e.g. in NVS), though. As I mentioned before, if that is not sufficient for your use case, you can always upgrade to the 8685.