Product Overview
ESP8685 is an ultra-low-power and highly-integrated MCU-based SoC solution that supports 2.4 GHz Wi-Fi and Bluetooth® Low Energy (Bluetooth LE). It has:
• A complete Wi-Fi subsystem that complies with IEEE 802.11b/g/n protocol and supports Station mode, SoftAP mode, SoftAP + Station mode, and promiscuous mode
• A Bluetooth LE subsystem that supports features of Bluetooth 5 and Bluetooth mesh
• State-of-the-art power and RF performance
• 32-bit RISC-V single-core processor with a four-stage pipeline that operates at up to 160 MHz
• 400 KB of SRAM (16 KB for cache) and 384 KB of ROM on the chip, and SPI, Dual SPI, Quad SPI, and QPI interfaces that allow connection to external flash
• Reliable security features ensured by
– Cryptographic hardware accelerators that support AES-128/256, Hash, RSA, HMAC, digital signature and secure boot
– Random number generator
– Permission control on accessing internal memory, external memory, and peripherals
– External memory encryption and decryption
• Rich set of peripheral interfaces and GPIOs, ideal for various scenarios and complex applications
Block Diagram
Features
WiFi
• IEEE 802.11 b/g/n-compliant
• Supports 20 MHz, 40 MHz bandwidth in 2.4 GHz band
• 1T1R mode with data rate up to 150 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)
• 4 × virtual Wi-Fi interfaces
• Simultaneous support for Infrastructure BSS in Station mode, SoftAP mode, Station + SoftAP mode, and promiscuous mode
Note that when ESP8685 scans in Station mode, the SoftAP channel will change along with the Station channel
• Antenna diversity
• 802.11mc FTM
Bluetooth
• Bluetooth LE: Bluetooth 5, Bluetooth mesh
• Speed: 125 Kbps, 500 Kbps, 1 Mbps, 2 Mbps
• Advertising extensions
• Multiple advertisement sets
• Channel selection algorithm #2
CPU and Memory
• 32-bit RISC-V single-core processor, up to 160 MHz
• 384 KB ROM
• 400 KB SRAM (16 KB for cache)
• 8 KB SRAM in RTC
• 2 MB embedded flash
• SPI, Dual SPI, Quad SPI, and QPI interfaces that allow connection to multiple external flash
Advanced Peripheral Interfaces
• 15 × programmable GPIOs
• Digital interfaces:
– 3 × SPI (SPI0 and SPI1 are used to connect the embedded flash. Only SPI2 is available)
– 2 × UART
– 1 × I2C
– 1 × I2S
– Remote control peripheral, with 2 transmit channels and 2 receive channels
– LED PWM controller, with up to 6 channels
– Full-speed USB Serial/JTAG controller
– General DMA controller (GDMA), with 3 transmit channels and 3 receive channels
– 1 × TWAI® controller compatible with ISO 11898-1 (CAN Specification 2.0)
• Analog interfaces:
– 2 × 12-bit SAR ADCs, up to 6 channels
– 1 × temperature sensor
• Timers:
– 2 × 54-bit general-purpose timers
– 3 × watchdog timers
– 1 × 52-bit system timer
Low Power Management
• Power Management Unit with four power modes
Security
• Secure boot
• Flash encryption
• 4096-bit OTP, up to 1792 bits for use
• Cryptographic hardware acceleration:
– AES-128/256 (FIPS PUB 197)
• Permission Control
• SHA Accelerator (FIPS PUB 180-4)
• RSA Accelerator
• Random Number Generator (RNG)
• HMAC
• Digital signature
Applications (A Nonexhaustive List)
With ultra-low power consumption, ESP8685 is an ideal choice for IoT devices in the following areas:
• Smart Home
– Light control
– Smart button
– Smart plug
– Indoor positioning
• Industrial Automation
– Industrial robot
– Mesh network
– Human machine interface (HMI)
– Industrial field bus
• Health Care
– Health monitor
– Baby monitor
• Consumer Electronics
– Smart watch and bracelet
– Over-the-top (OTT) devices
– Wi-Fi and Bluetooth speaker
– Logger toys and proximity sensing toys
• Smart Agriculture
– Smart greenhouse
– Smart irrigation
– Agriculture robot
• Retail and Catering
– POS machines
– Service robot
• Audio Device
– Internet music players
– Live streaming devices
– Internet radio players
• Generic Low-power IoT Sensor Hubs
• Generic Low-power IoT Data Loggers
View More:
https://www.espressif.com/sites/default/files/documentation/esp8685_datasheet_en.pdf