ESP32 Forum

Hi! I've seem to discovered something interesting regarding the ESP32 C3 WROOM 02 module datasheet.

I made a custom board with this module, and I based my design on the Figure 9-1 (Peripheral Schematics) from the datasheet.

In this figure, there it is a button for enable (EN) pin and a pull-up resistor. Assuming that this pin should always be pulled high, and to enable the module the button pulls the EN pin low. Which activates the module.

However, Table 3-1 (Pin Definitions) seem to describe the function of EN pin differently. The following is stated:

High: on, enables the chip.
Low: off, the chip powers off.
Note: Do not leave the EN pin floating.

Nonetheless, I did design my board based on Figure 9-1, and it seems like the module gets activated after pressing the "enable"-button.

Would it be possible to clarify if the information about EN pin in Table 3-1 is incorrect, or I have misunderstood it?

Best regards,
EngEmil

Hi,

On the ESP32-C3-WROOM-02, the EN pin is the chip enable (reset) input:

Function:
High: Chip is enabled and can run normally.
Low: Chip powers off (internal circuits are held in reset / powered down).

Design requirement:
The EN pin must not be left floating; it should be pulled up to 3.3 V (typically via a resistor) and driven low only when you want to reset or power down the chip.

So, when the EN pin is HIGH, the ESP32-C3 will run, and when the EN pin is LOW, it will power the chip off.

this pin should always be pulled high, and to enable the module the button pulls the EN pin low. Which activates the module.

More precisely, pressing the button and pulling the pin low does not "activate" the module; releasing the button after it has been pressed is what lets the chip run from its reset state.