Espressif ESP32-U4WDH Wi-Fi + Bluetooth SoC Dual-Core 240MHz 4MB Flash QFN-48

ESP32-U4WDH Product Overview

The ESP32-U4WDH is a highly integrated, low-power dual-core Wi-Fi + Bluetooth System-on-Chip (SoC) from Espressif Systems, featuring an Xtensa® 32-bit LX6 dual-core processor running at up to 240MHz. Housed in a QFN-48-EP (5×5mm) ultra-compact package, it integrates 4MB embedded Flash, 448KB ROM, 520KB SRAM, and 16KB RTC SRAM. The ESP32-U4WDH supports 2.4GHz Wi-Fi (802.11 b/g/n) and Bluetooth v4.2 BR/EDR + BLE dual-mode wireless communication. As the core chip of the ESP32-MINI-1 series modules, manufactured on TSMC's 40nm ultra-low-power process, it is widely used in smart home, industrial automation, consumer electronics, and IoT sensor applications.

ESP32-U4WDH Key Features

The ESP32-U4WDH features an Xtensa® dual-core 32-bit LX6 microprocessor running at up to 240MHz, delivering 400 MIPS of processing power. On-chip memory includes 448KB ROM, 520KB SRAM, and 16KB RTC SRAM. The chip integrates 4MB embedded Flash, eliminating the need for an external Flash chip.

The ESP32-U4WDH supports 2.4GHz Wi-Fi (IEEE 802.11b/g/n) with data rates up to 150Mbps, output power of 19.5dBm ~ 20.5dBm, and receiver sensitivity down to -98dBm. It supports Bluetooth v4.2 including Classic Bluetooth and BLE. Operating voltage range is 2.3V ~ 3.6V, and temperature range is -40°C ~ +105°C. MSL rating is 3 (168 hours).

The ESP32-U4WDH provides up to 28 programmable GPIOs. Digital interfaces include SD card, UART, SPI, SDIO, I2C, LED PWM, motor PWM, I2S, IR, pulse counter, capacitive touch sensor, ADC, DAC, Ethernet MAC, and TWAI® (CAN 2.0) . Serial interfaces support I2C, I2S, SPI, and UART. Integrated 40MHz crystal oscillator and 4MB SPI Flash.

Security features include Secure Boot, Flash Encryption, and hardware accelerators for AES, SHA, and RSA. Supports Wi-Fi frame aggregation (A-MPDU, A-MSDU) , Beacon auto-monitoring (hardware TSF) , and 4× virtual Wi-Fi interfaces with simultaneous Station, SoftAP, and Promiscuous modes.

ESP32-U4WDH Applications

With its powerful dual-core processing, embedded Flash, and dual-mode wireless connectivity, the ESP32-U4WDH is widely used in:

Smart Home & Appliances: Smart lighting, smart plugs, smart locks, thermostats, bulbs, switches

Industrial Automation & Control: Industrial sensors, equipment monitoring, remote data acquisition

IoT Sensor Nodes: Low-power sensor hubs, environmental monitoring, data loggers

Consumer Electronics: Smart toys, remote controls, smart speakers, writing pads

Smart Security: Electricity meters, smart locks, security surveillance

Battery-Powered Devices: Low-power IoT devices, wearables

Education & Research: OpenHarmony development boards (e.g., Niobe U4)

Industrial Control: ESP32-MINI-1 based industrial control applications

ESP32-U4WDH Advantages and Highlights

The ESP32-U4WDH is a highly integrated SoC solution in Espressif's ESP32 series. Its core advantage lies in the single-chip integration of a dual-core processor, Wi-Fi, Bluetooth, and 4MB embedded Flash. With Flash directly封装 inside the chip, no external Flash is required, saving PCB area, simplifying hardware design, and reducing BOM cost.

The dual-core 240MHz LX6 processor delivers ample computing power for FreeRTOS and complex applications. 4MB embedded Flash provides generous storage for firmware and user data. 28 GPIOs and rich peripherals including UART, SPI, I2C, I2S, SDIO, PWM, ADC, DAC, and CAN 2.0 offer extensive connectivity.

The ESP32-U4WDH supports an industrial-grade -40°C ~ +105°C temperature range, with output power up to 20.5dBm and receiver sensitivity down to -98dBm. The 40nm ultra-low-power process delivers high performance with extremely low power consumption.

Comprehensive hardware security includes Secure Boot, Flash Encryption, and AES/SHA/RSA hardware accelerators.

Mature software ecosystem: Espressif provides a complete ESP-IDF framework with support for FreeRTOS, Arduino IDE, and MicroPython. The ESP32-U4WDH is widely adopted in ESP32-MINI-1 modules and supported in the OpenHarmony ecosystem.

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FAQs:

1. Question: What is the ESP32-U4WDH chip?
   Answer: It is a wireless transceiver SoC from Espressif that integrates 2.4 GHz Wi-Fi and Bluetooth v4.2 dual-mode communication functionality.

2. Question: What is the core processor and frequency?
   Answer: It features an Xtensa 32-bit LX6 processor in single- or dual-core configurations, with a maximum main frequency of 240 MHz.

3. Question: Is there any memory inside the chip?
   Answer: It integrates 4MB of SiP Flash, along with 448 KB ROM, 520 KB SRAM, and 16 KB RTC SRAM.

4. Question: What wireless protocols does it support?
   Answer: It supports IEEE 802.11b/g/n Wi-Fi and the complete Bluetooth v4.2 standard, including BR/EDR and Low Energy (BLE).

5. Question: What package and dimensions does it use?
   Answer: It adopts a QFN-48-EP package measuring 5.0 mm × 5.0 mm with an exposed thermal pad.

6. Question: What are the operating voltage and temperature ranges?
   Answer: The operating voltage range is 2.3V to 3.6V, and the operating temperature range covers -40°C to +105°C.

7. Question: How is the RF performance?
   Answer: Maximum output power is 20.5 dBm for Wi-Fi and +9 dBm for Bluetooth; receive sensitivity is approximately -98 dBm (Wi-Fi) and -94 dBm (BLE).

8. Question: How many programmable pins are available?
   Answer: There are 34 GPIOs, of which 6 are input-only and 6 are occupied by the SiP Flash, so pin multiplexing requires careful attention.

9. Question: What is it mainly used for?
   Answer: It is suitable for low-power IoT devices requiring 2.4 GHz connectivity, such as smart home systems, wearables, industrial sensors, and consumer electronics.

10. Question: Does it have hardware security features?
    Answer: It supports secure boot and flash encryption to prevent firmware tampering and illegal data reading, offering basic security for devices.