FSC-BT645 BLE 4.2 Programmable Module with 8dBm Maximum Output Power


The Feasycom FSC-BT645 is a Bluetooth Low Energy (BLE) 4.2 module with a 32-bit MCU microcontroller that can be used as an application processor as well as a data pump in fully hosted systems. It supports a wide range of applications from low-end, price sensitive designs to computing-intensive ones and provides advanced high-end features in economical products. Very low active RF, MCU current and low-power mode current consumption provide excellent battery lifetime and allow for operation on small coin cell batteries and in energy-harvesting applications. The BLE 4.2 firmware includes the L2CAP service layer protocols, Security Manager (SM), ATT, GATT and GAP.


  • 2.4GHz RF transceiver compatible with BLE 4.2
  • Low power consumption
  • Programmable TX power up to 8 dBm
  • Postage stamp sized form factor
  • Programmable baud-rate generator (baudrate can up to 921600 bps)
  • Supports UART, I2C, SPI, and PWM control interfaces
  • Bluetooth stack profiles support HID and GATT


  • Health thermometer
  • Heart rate
  • Blood pressure
  • Proximity
  • Human interface device (HID)


Bluetooth Module FSC-BT645
Bluetooth Standard BLE 4.2
Frequency Band 2.402~2.480GHz ISM band
Transmit Output Power +8 dBm (Max.)
Receive Sensitivity -90 dBm (Typ.)
Profiles HID, GATT
Interfaces UART, GPIO, I2C, ADC, PWM
Size (mm) 10.8 × 13.5 × 2.2 (1mm pad pitch)
Power Supply 2.2~3.6V
Operating Temperature -40℃ to +85℃
Storage Temperature -40℃ to +125℃

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