ESP32-WROOM-32 Wi-Fi Bluetooth® Module

By Schtoeta Engineering Ltd. 131

ESP32-WROOM-32 Wi-Fi Bluetooth® Module

Schtoeta's ESP32-WROOM-32 is a powerful, generic Wi-Fi + BT + BLE MCU module that targets a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming, and MP3 decoding.

At the core of this module is the ESP32-D0WDQ6 chip. The embedded chip is designed to be scalable and adaptive. There are two CPU cores that can be individually controlled, and the CPU clock frequency is adjustable from 80 MHz to 240 MHz. The user may also power off the CPU and make use of the low-power co-processor to constantly monitor the peripherals for changes or crossing of thresholds. ESP32 integrates a rich set of peripherals including capacitive touch sensors, Hall sensors, SD card interface, Ethernet, high-speed SPI, UART, I²S, and I²C.

The integration of Bluetooth, Bluetooth LE, and Wi-Fi ensures that a wide range of applications can be targeted and that the module is well-rounded. Using Wi-Fi allows a large physical range and direct connection to the internet through a Wi-Fi router, while using Bluetooth allows the user to conveniently connect to the phone or broadcast low-energy beacons for its detection. The sleep current of the ESP32 chip is less than 5 µA, making it suitable for battery powered and wearable electronics applications. The module supports a data rate of up to 150 Mbps, and 20 dBm output power at the antenna to ensure the widest physical range. As such the module offers industry-leading specifications and the best performance for electronic integration, range, power consumption, and connectivity.

The operating system chosen for ESP32 is freeRTOS with LwIP; TLS 1.2 with hardware acceleration is built in as well. Secure (encrypted) over the air (OTA) upgrade is also supported, so users can upgrade their products even after their release, at minimum cost and effort.

  • Address space
    • Symmetric address mapping
    • 4 GB (32-bit) address space for both data bus and instruction bus
    • 1296 KB embedded memory
    • 19704 KB external memory
    • 512 KB peripheral
    • Some embedded and external memory regions can be accessed by either data bus or instruction bus
    • 328 KB DMA
  • External memory
    • Off-chip SPI memory can be mapped into the available address space as external memory. Parts of the embedded memory can be used as transparent cache for this external memory
    • Supports up to 16 MB off-chip SPI Flash
    • Supports up to 8 MB off-chip SPI SRAM
  • Embedded memory
    • 448 KB internal ROM
    • 520 KB internal SRAM
    • 8 KB RTC FAST memory
    • 8 KB RTC SLOW memory
  • Peripherals
    • 41 peripherals
  • DMA
    • 13 modules are capable of DMA operation
  • Low-power sensor networks
  • Voice encoding
  • Music streaming
  • MP3 decoding
  • IoT