Features
Wi-Fi
• Complies with IEEE 802.11b/g/n
• Supports 20 MHz bandwidth in 2.4 GHz band
• 1T1R mode with data rate up to 72.2 Mbps
• Wi-Fi Multimedia (WMM)
• TX/RX A-MPDU, TX/RX A-MSDU
• Immediate Block ACK
• Fragmentation and defragmentation
• Transmit opportunity (TXOP)
• Automatic Beacon monitoring (hardware TSF)
• Three virtual Wi-Fi interfaces
• Simultaneous support for Infrastructure BSS in Station mode, SoftAP mode, Station + SoftAP mode, and
promiscuous mode
Note that when ESP8684 series scans in Station mode, the SoftAP channel will change along with the
Station channel
• Antenna diversity
Bluetooth
• Bluetooth LE: Bluetooth 5.3 certified
• High power mode (20 dBm)
• Speed: 125 Kbps, 500 Kbps, 1 Mbps, 2 Mbps
• Advertising extensions
• Multiple advertisement sets
• Channel selection algorithm #2
• Internal co-existence mechanism between Wi-Fi and Bluetooth to share the same antenna
CPU and Memory
• 32-bit RISC-V single-core processor, up to 120 MHz
• CoreMark® score:
– One core at 120 MHz: 305.42 CoreMark; 2.55 CoreMark/MHz
• 576 KB ROM
• 272 KB SRAM (16 KB for cache)
• In-package flash (see details in Chapter 1 ESP8684 Series Comparison)
• Access to flash accelerated by cache
• Supports flash in-Circuit Programming (ICP)
Advanced Peripheral Interfaces
• 14 programmable GPIOs
– 2 strapping GPIOs
• Digital interfaces:
– Three SPI
– Two UART
– I2C Master
– LED PWM controller, with up to 6 channels
– General DMA controller (GDMA), with 1 transmit channel and 1 receive channel
• Analog interfaces:
– 12-bit SAR ADC, up to 5 channels
– Temperature sensor
• Timers:
– 54-bit general-purpose timer
– Two watchdog timers
– 52-bit system timer
Low Power Management
• Fine-resolution power control through a selection of clock frequency, duty cycle, Wi-Fi operating modes,
and individual power control of internal components
• Four power modes designed for typical scenarios: Active, Modem-sleep, Light-sleep, Deep-sleep
• Power consumption in Deep-sleep mode is 5 μA
• RTC memory remains powered on in Deep-sleep mode
Security
• Secure boot - permission control on accessing internal and external memory
• Flash encryption - memory encryption and decryption
• 1024-bit OTP, up to 256 bits for users
• Cryptographic hardware acceleration:
– ECC
– SHA Accelerator (FIPS PUB 180-4)
• Random Number Generator (RNG)
• Clock glitch filter
RF Module
• Antenna switches, RF balun, power amplifier, low-noise receive amplifier
• Up to +22 dBm of power for an 802.11b transmission
• Up to +20 dBm of power for an 802.11n transmission
• Up to -106 dBm of sensitivity for Bluetooth LE receiver (125 Kbps)
Applications
With ultra-low power consumption, ESP8684 is an ideal choice for IoT devices in the following areas:
• Smart Home
• Industrial Automation
• Health Care
• Consumer Electronics
• Smart Agriculture
• POS Machines
• Service Robot
• Generic Low-power IoT Sensor Hubs
• Generic Low-power IoT Data Loggers