FSC-BT671B Silicon Labs EFR32MG21 BLE 5.2 SIG Mesh MCU Module with 10dBm Maximum Output Power


The Feasycom FSC-BT671B Silicon Labs EFR32MG21 BLE 5.2 & SIG Mesh & Multi-Connection Bluetooth Low Energy module includes a 32-bit 80 MHZ ARM Cortex-M33 microcontroller, which can provide a maximum power output of 10 dBm. The chip's maximum receiving sensitivity is -97.5 (1 Mbit/s GFSK) dBm, and it supports a complete DSP instruction and floating-point unit for efficient signal processing. Low-power gecko technology supports fast wake-up time and energy-saving mode. FSC-BT671B software and SDK support Bluetooth Low Energy (LE), Bluetooth 5.2 and Bluetooth mesh network. The module also supports the development of proprietary wireless protocols. FSC-BT671B combines an energy-friendly MCU with a highly integrated radio transceiver. The module is suited for any battery operated application other systems requiring high performance and low energy consumption.


  • Compatible with Bluetooth Low Energy (BLE), Bluetooth 5.2 and Bluetooth mesh specification
  • Integrate MCU to execute Bluetooth protocol stack
  • Postage stamp sized form
  • Class 1 support (up to +10 dBm)
  • The default UART Baud rate is 115.2Kbps and can support from 1200bps up to 230.4Kbps
  • UART, I2C, SPI, and 12-bit ADC (200ks/S) data connection interfaces
  • Supports the OTA upgrade
  • Bluetooth stack profiles support LE HID and all BLE protocols
  • PWM


  • Lighting
  • Connected Home
  • Gateways and Voice Assistants
  • Building Automation and Security


Bluetooth Module FSC-BT671B
Chipset Silicon Labs EFR32MG21
Bluetooth Standard BLE 5.2
Frequency Band 2.4 GHz to 2.4835 GHz
Transmit Power +10 dBm (Maximum)
Receive Sensitivity -97.5 dBm @ 1 Mbps GFSK, -94.4 dBm @ 2 Mbps GFSK, -104.9 dBm @ 125 Kbps GFSK
Profiles GATT, MFi
Interfaces UART, GPIO, I2C, ADC, PWM
Size (mm) 10 × 11.9 × 1.8 (Pad Pitch 1.1mm)
Power Supply 1.71~3.8V
Operating Temperature -40℃ to +105℃
Storage Temperature -40℃ to +105℃

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