ESP32 Forum

Hello,

Can i have reply for below queries for the ESP32-MINI-1-N4?

1) Can we connect external NOR flash on VSPICS0,VSPICLK,VSPID,VSPIQ of ESP32-MINI-1-N4?
2) Can we use GPIO0 as I2C_SDA and GPIO4 as I2C_SCL in ESP32-MINI-1-N4?
3) What max size of NOR flash can be connected with ESP32-MINI-1-N4?
4) Can we configure any GPIos as UART1 RTS & CTS of ESP32-MINI-1-N4?

Thanks,
Brijesh K

I. Yes, you could use VSPI to connect a second flash, but just for storage, this flash could not share same function with the embedded one.
2. Yes, you could use them as I2C, but please add test point for IO0.
3. for storage, at least 16 MB, I have seen some cases, I will check it.
4. Yes, but please be noted those only for inputs can only be RX.

3. External storage flash could support up to 256 MB.

Hello,

Than you so much for your valuable reply.

I will come if any new queries.

Brijesh K

Hello,

sorry i missed one thing to ask,

Does ESP32-MINI-1-N4 module has in built RTC? Can we use it so that we can avoid external RTC usage?

Thanks,
Brijesh K

If you mean use a backup power for RTC supply to retain time, we could not support this function. We could enter into deep sleep for low power consumption while remaining RTC IO states.

Hello,

"If you mean use a backup power for RTC supply to retain time, we could not support this function. We could enter into deep sleep for low power consumption while remaining RTC IO states"

->> Yes correct that I understood that it does not have back up supply for RTC.

But I was asking here for the Integrated RTC inside ESP32-MINI-1-N4. Does ESP32-MINI-1-N4 has integrated and can we use it?

Also can you please confirm that while ESP32-MINI-1-N4 is in deep sleep state will it retain real time?

Thanks,
Brijesh K

Yes, we have RTC function and could retain time while deep sleep.

OK thank you so much for quick reply and confirmation.

Regards,
Brijesh K

Hello,

I need one help please.

In ESP32-MINI-1-N4 I see that there are additional 8 pins which are mentioned as GND but in schematic given in module datasheet they have connected pin55 only GND and not others so please suggest what to do of those all additional pins should connect all of them to GND OR connect only pin55 with GND and keep others NC.

Should I cover all of them into schematic symbol as well because in schematic i see only pin55 is covered?

Please see attached images for reference.

Thanks,
Brijesh K