What is logic level output voltage of ESP32 (ESP32 ESP-WROOM-32 )? 5v or 3.3v?
I have to connect Lora module "REYAX RYLR998" to it, which works with 3.3v only.

 

Hi Mr

It is 3.3v

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Per the datasheet, it is a 3.3V part. So 3.3V.

 

Per the datasheet, it is a 3.3V part. So 3.3V.

View attachment 294590

Thanks, So I can connect REYAX RYLR998" to it, which works with 3.3v only, without using resisters to divide voltage.
I saw many used resistors to divide voltage.

 

Hi Mr,
Some 3.3V input MCU's which have inputs from a 5v signal sources, use a resistive divider, to reduce the 5V to a 3.3v level.
E

Example:
Vout= Vin * (R2/(R1+R2))
Vout = 5v * (3k3/(1k8+3k3))

 

There is a great deal of conflicting information concerning the ESP-32 and whether it's digital inputs are 5V tolerant.

While the datasheets clearly state the maximum input is VDD +0.3V (the chip will operate as low as 2.3V if no flash or PSRAM is present) there are "official" statements from representatives of Espressif stating the pins are 5V tolerant.

Personally, I would go by the datasheet unless I had a compelling reason to use 5V, then I would test and expect to fry a chip. But since the official specs don't support 5V operation, even if they are currently able to tolerate the higher voltage there is no guarantee the next chip you buy will do that.

 

there are "official" statements from representatives of Espressif stating the pins are 5V tolerant.

Are you certain about this? This is true for the ESP8266 ( I have read the actual message thread where this statement was made), but as I recall, it's been explicitly stated that this DOES NOT apply to ESP32.

This may have changed for some of the more recent variants, I haven't kept up with them all.

 

There is a great deal of conflicting information concerning the ESP-32 and whether it's digital inputs are 5V tolerant.

While the datasheets clearly state the maximum input is VDD +0.3V (the chip will operate as low as 2.3V if no flash or PSRAM is present) there are "official" statements from representatives of Espressif stating the pins are 5V tolerant.

Personally, I would go by the datasheet unless I had a compelling reason to use 5V, then I would test and expect to fry a chip. But since the official specs don't support 5V operation, even if they are currently able to tolerate the higher voltage there is no guarantee the next chip you buy will do that.

You mean provide input itself as 3.3V right? I supply 5V input and it tolerate, i mean to ESP32 dev board, it internally drop voltage to 3.3 using voltage regulator.

 

Hi Mr,
Use the voltage divider I posted in post# 5, it works, and it is required for ESP32 Input.
E

 

Hi Mr,
Use the voltage divider I posted in post# 5, it works, and it is required for ESP32 Input.
E

Many thanks.

 

What is logic level output voltage of ESP32 (ESP32 ESP-WROOM-32 )? 5v or 3.3v?
I have to connect Lora module "REYAX RYLR998" to it, which works with 3.3v only.

It's 3.3V. Here is the datasheet:

https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf