Description

The ESP32-WROOM-32 WiFi module is independently designed and developed by Espressif Systems. The core processor of this module, the ESP32-WROOM-32, provides a complete 802.11 b/g/n/e/i Wireless Local Area Network (WLAN) and Bluetooth 4.2 solution in a small physical form factor. This chip is specifically designed for low-power and mobile consumer electronics, wearables, and IoT devices. It integrates all WLAN and Bluetooth functionalities on-chip, featuring low cost and efficient layout. The ESP32-WROOM-32 also offers an open platform that supports flexible customization of functions for various application scenarios.

ESP32-WROOM-32 Block Diagram

The ESP32-WROOM-32 is a WiFi and Bluetooth system-on-chip (SoC) with industry-leading RF performance, low power consumption, and high integration. It integrates complete transmit/receive RF functions, including antenna switch, RF balun, power amplifier, low-noise amplifier, filters, power management module, and advanced self-calibration circuitry. The self-calibration circuitry enables dynamic automatic adjustment to eliminate defects in external circuits. The ESP32-WROOM-32 features two 32-bit LX6 CPUs with a main frequency of up to 240 MHz, adopting a 7-stage pipeline architecture. It also integrates a rich set of analog sensors and digital interfaces.

The ultra-low-power RF architecture and patented power-saving technologies of the ESP32-WROOM-32 extend battery life in practical applications.

The ESP32-WROOM-32 fully complies with WiFi 802.11 b/g/n/e/i and Bluetooth 4.2 standards, integrating WiFi/Bluetooth/BLE RF and low-power technologies, and supports an open Real-Time Operating System (RTOS). The integrated adjustment cache of the ESP32-WROOM-32 helps improve system performance and optimize system storage. The flexible RAM/ROM partitioning architecture allows users to customize it to meet specific requirements and use cases.

The ESP32-WROOM-32 can operate as a standalone application or as a slave device to a host MCU. As a slave device, the ESP32-WROOM-32 provides WiFi and Bluetooth functionalities through SPI/SDIO or I2C/UART interfaces.

Product Features

2.1 WiFi

• 802.11 b/g/n/e/i
• 802.11 n (2.4 GHz) with speeds up to 150 Mbps
• 802.11 e: QoS mechanisms for wireless multimedia technology
• WMM-PS, UAPSD
• A-MPDU and A-MSDU frame aggregation
• Block ACK
• Fragmentation and reassembly
• Automatic beacon monitoring/scanning
• 802.11 i security features: pre-authentication and TSN
• Supports WPA/WPA2/WPA2-Enterprise/WPS encryption
• Infrastructure BSS Station mode/SoftAP mode
• Wi-Fi Direct (P2P), P2P discovery, P2P GO mode, and P2P power management
• UMA compatible and certified
• Antenna diversity and selection

2.2 Bluetooth

• Bluetooth v4.2 full standard, including classic Bluetooth (BR/EDR) and Bluetooth Low Energy (BLE)
• Supports standard Class-1, Class-2, and Class-3 without the need for an external power amplifier
• Enhanced power control
• Output power up to +10 dBm
• NZIF receiver with BLE receive sensitivity of -98 dBm
• Adaptive Frequency Hopping (AFH)
• Standard HCI based on SDIO/SPI/UART interfaces
• High-speed UART HCI with speeds up to 4 Mbps
• Supports BT4.2 controller and host protocol stack
• Service Discovery Protocol (SDP)
• Generic Access Profile (GAP)
• Security Manager Protocol (SMP)
• Bluetooth Low Energy
• ATT/GATT
• HID
• Supports all GATT-based BLE applications
• SPP-Like BLE data transparent transmission protocol
• BLE Beacon
• A2DP/AVRCP/SPP, HSP/HFP, RFCOMM
• CVSD and SBC audio codec algorithms
• Bluetooth piconet and scatternet

2.3 CPU and Memory

• Xtensa® 32-bit LX6 dual-core processor with computing power up to 600 DMIPS
• 448 KByte ROM
• 520 KByte SRAM
• 16 KByte SRAM in RTC
• QSPI supporting up to 4 Flash/SRAM connections, each Flash Max 16 MBytes
• Supply voltage: 2.2V to 3.6V

2.4 Clocks and Timers

• Built-in 8 MHz oscillator with self-calibration support
• Built-in RC oscillator with self-calibration support
• Supports external crystals from 2 MHz to 40 MHz
• Supports external 32 kHz crystal for RTC with self-calibration
• 2 timer groups, each including 2 64-bit general-purpose timers and 1 main system watchdog
• RTC timer with sub-second accuracy
• RTC watchdog

2.5 Peripheral Interfaces

• 12-bit SAR ADC with up to 18 channels
• 2 8-bit D/A converters
• 10 touch sensors
• Temperature sensor
• 4 SPI interfaces
• 2 I2S interfaces
• 2 I2C interfaces
• 3 UART interfaces
• 1 Host SD/eMMC/SDIO interface
• 1 Slave SDIO/SPI interface
• Ethernet MAC interface with dedicated DMA, supporting IEEE 1588
• CAN 2.0
• IR (TX/RX)
• Motor PWM
• LED PWM with up to 16 channels
• Hall sensor
• Ultra-low-power pre-amplifier for analog signals

2.6 Security Mechanisms

• Supports all IEEE 802.11 security features, including WFA, WPA/WPA2, and WAPI
• Secure boot
• Flash encryption
• 1024-bit OTP, with up to 768 bits available for user use
• Cryptographic hardware accelerator:
  • AES
  • HASH (SHA-2) library
  • RSA
  • ECC
  • Random Number Generator (RNG)

2.7 Applications

• General low-power IoT sensor hub
• General low-power IoT logger
• Video streaming transmission for cameras
• OTT TV boxes/set-top box devices
• Music players
  • Network music players
  • Audio streaming devices
• Wi-Fi toys
  • Counters
  • Toy anti-loss devices
• Wi-Fi voice recognition devices
• Headsets
• Smart outlets
• Home automation
• Mesh networks
• Industrial wireless control
• Baby monitors
• Wearable electronics
• Wi-Fi location-aware devices
• Secure ID tags
• Health and medical applications
  • Motion monitoring and anti-loss alarms
  • Temperature loggers

Product Basic Parameters:

Category	Parameter	Description
Wireless Parameters	Standards Certification	FCC/CE/TELEC
	Wireless Standards	802.11 b/g/n/e/i Bluetooth 4.2 (BR/EDR/BLE)
	Frequency Range	2.4GHz-2.5GHz (2400M-2483.5M)
Hardware Parameters	Data Interfaces	UART/SPI/I2C/I2S/IR/CAN
		GPIO/PWM
	Operating Voltage	3.0~3.6V
	Operating Current	Average: 90mA
	Operating Temperature	-40°~125°
	Storage Temperature	Room temperature
	Package Size	18mm*25.50mm*3mm
	External Interface	N/A
Software Parameters	Wireless Network Modes	Station/SoftAP/SoftAP+Station
	Security Mechanisms	WFA、WPA/WPA2,WAPI
	Encryption Types	WEP/TKIP/AES
	Firmware Upgrade	Local serial port burning / Cloud upgrade / Host download and burning
	Software Development	Supports customer-defined servers Provides SDK for customer secondary development
	Network Protocols	IPv4, TCP/UDP/HTTP/FTP
	User Configuration	AT+ command set, cloud server, Android/iOS APP

 

Interface Definition:

Appearance and Dimensions

The appearance dimensions of the ESP32-WROOM-32 module are 18mm25.50mm(2.8 ± 0.1)mm (as shown in the figure). The module uses 4MB of SPI Flash in a WSOP-8 package. The module is equipped with a 3dBi PCB on-board antenna.