FSC-BT3721V EFR32BG22 Automotive Qualified BLE 5.3 Module


FSC-BT3721V supports Bluetooth 5.3 network (BLE) and meets the requirements of AEC-Q100 standard. By default, the FSC-BT3721V module is flashed with Feasycom firmware, which is powerful and user-friendly. It's easy to use and completely encapsulated. Feasycom firmware enables users to access Bluetooth functionality through simple ASCII commands sent to the modules over a serial interface, just like a Bluetooth modem. As a result, FSC-BT3721V provides an ideal solution for developers who want to integrate Bluetooth wireless technology into their design.


  • Low Power Wireless System-on-Chip
  • 32-bit ARM® Cortex®-M33 core with 76.8MHz maximum operating frequency
  • Up to 512KB of flash and 32KB of RAM
  • Energy-efficient radio core with low active and sleep currents
  • Bluetooth 5.3 Direction Finding
  • Integrated PA with up to 6dBm (2.4GHz) TX power
  • Secure Boot with Root of Trust and Secure Loader (RTSL)
  • 2.4GHz radio operation
  • -106.7dBm sensitivity @ 125Kbps GFSK
  • -98.9dBm sensitivity @ 1Mbit/s GFSK
  • -96.2dBm sensitivity @ 2Mbit/s GFSK
  • TX power up to 6 dBm
  • 2.5mA radio receive current
  • 3.4mA radio transmit current @ 0dBm output power
  • 7.5mA radio transmit current @ 6dBm output power
  • Low System Energy Consumption
  • 3.6mA RX current (1Mbps GFSK)
  • 4.1mA TX current @ 0dBm output power
  • 8.2mA TX current @ 6dBm output power
  • 27 μA/MHz in Active Mode (EM0) at 76.8 MHz
  • 1.40μA EM2 Deep Sleep current (32KB RAM retention and RTC running from LFXO)
  • 1.75μA EM2 Deep Sleep current (32KB RAM retention and RTC running from Precision LFRCO)
  • 0.17μA EM4 current
  • Supported Modulation Format
  • 2 (G)FSK with fully configurable shaping
  • (G)MSK
  • Supported Protocols
  • Bluetooth Low Energy (Bluetooth 5.3)
  • Direction finding using Angle-of-Arrival (AoA) and Angle-of-Departure (AoD)
  • Proprietary


  • Tags and Beacons of Assets
  • Consumer Electronics Remote Controls
  • Portable Medical
  • Bluetooth Mesh Low Power Nodes
  • Sports, Fitness, and Wellness devices
  • Connected Home
  • Building Automation and Security
  • Automotive Applications


BLE Module FSC-BT3721V
Chipset Silicon Labs EFR32BG22
Bluetooth Standard BLE 5.3
Frequency Band 2402MHz ~ 2480MHz
Transmit Output Power +6 dBm (Max.)
Receive Sensitivity -98 dBm @ 1Mbit/s GFSK
Interfaces UART, SPI, PIO, ADC
Size (mm) 16.6 × 13.7 × 2.3
Supply Voltage 1.75V~3.8V
Operating Temperature -40℃ to +85℃
Storage Temperature -40℃ to +125℃
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