FSC-BT671D Silicon Labs EFR32BG21 Bluetooth Low Energy BLE 5.2 Mesh Module


The Bluetooth low energy(BLE) chip used by FSC-BT671D includes a 32-bit 80 MHz ARM Cortex-M33 microcontroller, which can provide a maximum power output of 20dBm. The chip's maximum receiving sensitivity is -97.5 (1 Mbit/s GFSK) dBm, and it supports a complete DSP instruction set and floating point unit, which can speed up calculations. Low-power gecko technology supports fast wake-up time and energy-saving mode. FSC-BT671D 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-BT671D 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.It supports Wirepas Mesh protocal

Support communicating with the FeasyBlue app and many other Bluetooth apps.

Basic Parameter

Bluetooth Module Model FSC-BT671D
Bluetooth version BLE 5.2
Dimension 10mm x 11.9mm x 1.8mm, Pad Pitch 1.5mm
Interface UART
Profiles GATT Server/ GATT Client optional
Frequency 2.4 - 2.4835 GHz
Transmit power +20dBm (maximum)
Power supply 1.71V ~ 3.8V
Antenna External antenna required
Operating -40°C to +105°C
Storage -40°C to +105°C
Highlights Ultra small size, Class 1, BLE 5.2, BLE Mesh network

Main Features

  • Bluetooth low energy (BLE) 5.2
  • Integrate MCU to execute Bluetooth protocol stack
  • Postage stamp sized form
  • Class 1 support (up to +20 dBm)
  • The default UART Baud rate is 115.2Kbps and can support from 1200bps up to 230.4Kbps
  • UART, I2C, SPI, 12-bit 1Msps SAR ADC
  • Support the OTA upgrade
  • Bluetooth stack profiles support: LE HID and all BLE protocols
  • PWM


  • Health & Medical Devices
  • Home Automation
  • Wearable Device
  • SIG Mesh
  • Asset Tracking

Firmware Options

Firmware No. Application Profiles Support
FSC-BT671D BLE Master & Slave BLE, OTA
FSC-BT671D Mesh Network MESH
FSC-BT671D Gateway Gateway
FSC-BT671D Other Customization


Type Title Date
Datasheet Feasycom FSC-BT671D Datasheet April 6, 2022

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