ESP32-WROOM-32E -N4 Detailed explanation of pin function specifications and circuit principle instructions
The model " ESP32-WROOM-32E-N4 " is part of the ESP32 series, which is developed by Espressif Systems, a well-known brand in the field of semiconductors and wireless communication. This particular model, the ESP32-WROOM-32E-N4, is based on the ESP32 chip, which is widely used for Wi-Fi and Bluetooth applications, particularly in Internet of Things (IoT) devices.
Packaging Type for ESP32-WROOM-32E-N4:
Package Type: The ESP32-WROOM-32E-N4 typically comes in a QFN (Quad Flat No-lead) package. Lead Count: The number of leads in this package can vary, but for the ESP32-WROOM-32E, the package generally has 38 pins.Detailed Pin Function List for ESP32-WROOM-32E-N4:
Below is a comprehensive list of all 38 pins of the ESP32-WROOM-32E-N4 and their respective functions:
Pin No. Pin Name Function Description 1 EN Enable Pin: Active high pin to enable the ESP32 module . Low will disable it. 2 IO34 Input-only pin, typically used for digital input functions. 3 IO35 Input-only pin, typically used for digital input functions. 4 IO32 GPIO Pin, used for digital I/O, ADC, and other functions. 5 IO33 GPIO Pin, used for digital I/O, ADC, and other functions. 6 IO25 GPIO Pin, used for digital I/O, DAC, and other functions. 7 IO26 GPIO Pin, used for digital I/O, DAC, and other functions. 8 IO27 GPIO Pin, used for digital I/O, ADC, and other functions. 9 IO14 GPIO Pin, used for digital I/O, UART, PWM, etc. 10 IO12 GPIO Pin, used for digital I/O, UART, PWM, etc. 11 IO13 GPIO Pin, used for digital I/O, PWM, and other functions. 12 IO23 GPIO Pin, used for digital I/O, PWM, and other functions. 13 IO22 GPIO Pin, used for digital I/O, PWM, and other functions. 14 IO21 GPIO Pin, used for digital I/O, I2C, and other functions. 15 IO19 GPIO Pin, used for digital I/O, SPI, and other functions. 16 IO18 GPIO Pin, used for digital I/O, SPI, and other functions. 17 IO5 GPIO Pin, used for digital I/O, SPI, and other functions. 18 IO17 GPIO Pin, used for digital I/O, SPI, and other functions. 19 IO4 GPIO Pin, used for digital I/O, SPI, etc. 20 IO0 GPIO Pin, used for digital I/O, boot mode selection. 21 IO2 GPIO Pin, used for digital I/O, SPI, and other functions. 22 SDIO_CMD Used for SDIO command in SD card interface . 23 SDIO_CLK Used for SDIO Clock in SD card interface. 24 SDIO_DATA0 Data pin for SDIO interface. 25 SDIO_DATA1 Data pin for SDIO interface. 26 SDIO_DATA2 Data pin for SDIO interface. 27 SDIO_DATA3 Data pin for SDIO interface. 28 RXD UART Receiver pin. 29 TXD UART Transmitter pin. 30 RTS UART Request-to-send pin. 31 CTS UART Clear-to-send pin. 32 SCL I2C Clock pin, used for communication with I2C devices. 33 SDA I2C Data pin, used for communication with I2C devices. 34 V5 (V5_ESP) 5V input for powering the ESP32 module. 35 GND Ground Pin. 36 3V3 (3.3V) 3.3V input/output pin. 37 ADC1 ADC (Analog to Digital Converter) pin for analog input. 38 ADC2 ADC pin for analog input.Common FAQ for ESP32-WROOM-32E-N4
1. What is the function of pin EN on the ESP32-WROOM-32E-N4? Answer: The EN pin is the enable pin for the ESP32 module. When pulled high, it enables the module, and when pulled low, it disables the module. 2. Can I use the IO34 pin as an output pin? Answer: No, IO34 is an input-only pin. It cannot be used as an output pin. 3. What is the maximum voltage that I can apply to the 3.3V pin on the ESP32-WROOM-32E-N4? Answer: The 3.3V pin should only receive a maximum of 3.6V. Applying voltages higher than 3.6V can damage the module. 4. Which pins on the ESP32-WROOM-32E-N4 support I2C communication? Answer: The ESP32 supports I2C on IO21 (SDA) and IO22 (SCL). 5. Can I use the TXD and RXD pins for UART communication? Answer: Yes, the TXD and RXD pins on the ESP32-WROOM-32E-N4 are used for UART communication (TXD for transmitting, RXD for receiving). 6. What is the function of the ADC1 and ADC2 pins on the ESP32-WROOM-32E-N4? Answer: The ADC1 and ADC2 pins are used for analog-to-digital conversion, allowing you to read analog signals and convert them into digital values. 7. What is the boot mode for the ESP32-WROOM-32E-N4? Answer: The ESP32-WROOM-32E-N4 uses IO0 to select the boot mode. Pulling IO0 low during power-up enters download mode, while pulling it high boots normally. 8. What is the maximum output current of the ESP32 GPIO pins? Answer: Each GPIO pin can source or sink a maximum current of 12mA, with a recommended maximum of 6mA. 9. Can the IO12 pin be used for SPI communication? Answer: Yes, IO12 is capable of being used for SPI communication, specifically for the MISO (Master In Slave Out) pin. 10. Can I use the ESP32-WROOM-32E-N4 for Bluetooth communication? Answer: Yes, the ESP32-WROOM-32E-N4 supports both Bluetooth Classic and Bluetooth Low Energy (BLE) communication protocols. 11. What is the purpose of the SDIO pins on the ESP32-WROOM-32E-N4? Answer: The SDIO pins (SDIOCMD, SDIOCLK, SDIO_DATA0-3) are used for communication with SD cards and other SDIO devices. 12. How do I power the ESP32-WROOM-32E-N4? Answer: The ESP32 can be powered through the V5 (5V) or 3V3 pins, depending on the voltage level you are using for your system. 13. What is the maximum operating frequency of the ESP32-WROOM-32E-N4? Answer: The maximum clock frequency for the ESP32-WROOM-32E-N4 is 240 MHz. 14. Which pins support PWM functionality on the ESP32-WROOM-32E-N4? Answer: Several pins support PWM, including IO13, IO12, IO14, IO15, IO16, IO17, IO18, and IO19. 15. Can the ESP32-WROOM-32E-N4 be used in deep sleep mode? Answer: Yes, the ESP32 supports multiple low-power modes, including deep sleep, where only a small number of peripherals continue to function. 16. Which pins can be used for external interrupts? Answer: Most GPIO pins, including IO0, IO2, IO4, IO5, IO12, IO13, IO14, IO15, IO16, IO17, IO18, and IO19, can be configured for external interrupts. 17. What is the function of the IO25 pin on the ESP32-WROOM-32E-N4? Answer: IO25 is a general-purpose GPIO pin that can also be used for DAC output. 18. What is the typical current consumption of the ESP32-WROOM-32E-N4 in active mode? Answer: The typical current consumption in active mode is around 160mA, but it can vary depending on the workload. 19. Does the ESP32-WROOM-32E-N4 support hardware SPI? Answer: Yes, the ESP32 supports hardware SPI on several pins, including IO18, IO19, IO23, and IO5. 20. How do I reset the ESP32-WROOM-32E-N4? Answer: The ESP32 can be reset by toggling the EN (enable) pin low and then high again, or by using the internal software reset feature.This concludes the detailed overview of the ESP32-WROOM-32E-N4 pin functions and FAQ. Each pin has specific roles that make the ESP32-WROOM-32E-N4 highly versatile for IoT projects and embedded systems.