FSC-BT681 AB1611 BLE 5.0 SIG Mesh Module


FSC-BT681 is a compact Bluetooth module that integrates baseband, radio, and flash memory, designed to meet Bluetooth Version 5.0 specifications. Its small form factor includes an external antenna interface and 4Mibit embedded flash, ideal for custom software development in MESH equipment applications.


  • Bluetooth V5.0
  • Embedded 32-bit MCU
  • Embedded 4Mbit Flash
  • 64KB SRAM
  • UART programming and data interface (baudrate can up to 921600 bps)
  • UART/I2C/SPI/PWM control interfaces
  • Transmit power: 9.5 dBm
  • Receiving sensitivity: -94 dBm
  • Postage stamp sized form factor
  • Support External Antenna
  • RoHS compliant
  • Power Consumption In Sleep Mode (VDD_3V3 at 3.3V):
    • Discoverable: 2.80 mA
    • LE Connection: 931.55 uA
  • Power Consumption In Working Mode (VDD_3V3 at 3.3V):
    • Discoverable: 9.65 mA
    • LE Connection: 8.36 mA
    • LE Connection @ 115200 bps: 8.49 mA


  • Remote controller
  • SIG Mesh


Categories Features Implementation
Wireless Specification Bluetooth Version Bluetooth V5.0
Bluetooth Chip AIROHA AB1611
Frequency 2.402 ~ 2.480 GHz
Transmit Power +9.5 dBm (Maximum)
Receive Sensitivity -94 dBm @ 0.1% BER (Typical)
Host Interface and Peripherals UART Interface TX, RX, CTS, RTS
General Purpose I/O
Default 115200, N, 8, 1
Baudrate support from 1200 to 921600
5, 6, 7, 8 data bit character
GPIO 13 (maximum – configurable) lines
O/P drive strength (4 mA)
Pull-up resistor (33 KΩ) control
Read pin-level
I2C Interface 1 (configurable from GPIO total). Up to 400 kbps
ADC Interface Analog input voltage range: 0 ~ 3.3V
Supports single 12-bit ADC conversion
1 channel (configured from GPIO total)
PWM 1 General-Purpose Timer Modules
Supports PWM interrupts
Supports input capture function
Profiles Classic Bluetooth No Support
Bluetooth Low Energy GATT Client & Peripheral - Any Custom Services
Maximum Connections Classic Bluetooth No Support
Bluetooth Low Energy 1 Client
FW upgrade Via UART
Supply Voltage Supply 1.9V ~ 3.6V
Power Consumption Max Peak Current (TX current @ +9.5 dBm): 20.29 mA
Max Peak Current (RX current @ 1 Mbps): 4.76 mA
Sleep 4 uA
Deep Sleep 0.5 uA
Physical Dimensions (mm) 10 × 11.9 × 1.7; Pad Pitch 1.1
Environmental Operating -40°C to +85°C
Storage -65°C to +150°C
Miscellaneous Lead Free Lead-free and RoHS compliant
Warranty One Year
Humidity 10% ~ 90% non-condensing
MSL grade: MSL 3
ESD grade: Human Body Model: Class-2
Machine Model: Class-B

Firmware Options

Firmware No. Application Profiles Support
FSC-BT681 Data GATT (Server & Client), OTA
FSC-BT681 Other Customization
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