FSC-BT691 Dialog DA14531 Bluetooth Low Energy BLE 5.1 Transceiver Module

FSC-BT691 is an ultra-low-power Bluetooth module that uses the Dialog BLE 5.1 chip DA14531, supports UART/I2C/SPI interfaces.

FSC-BT691 is an ultra-low size Bluetooth 5.1 module with onboard antenna. Its ultra-small size is only 10mm * 11.9mm * 2mm, which provides users with ultra-high flexibility and multiple possibilities.

FSC-BT691 has certificated with CE,FCC,IC,KC,TELEC,SRRC

Main Features

  • Qualified Bluetooth v5.1 specifications
  • Postage stamp sized: 10mm x 11.9mm x 2mm
  • Low power
  • The default UART Baud rate is 115.2Kbps
  • GAP, ATT, GATT, SMP, L2CAP profiles
  • Bluetooth stack profiles: all BLE protocols
  • Support SPI, UART, I2C interface
  • Support the OTA upgrade
  • Integrated temperature sensor
  • Operating Temperature: -40°C to +85°C
  • Available certifications: FCC、CE、IC、KC、TELEC、SRRC

Basic Parameter

Bluetooth Module ModelFSC-BT691
Bluetooth versionBLE 5.1
Dimension10mm x 11.9mm x 2mm
CertificationsFCC、CE、IC、KC、TELEC、SRRC(BT691+Shield Case)
Transmit power-19.5dBm ~ 2.5dBm
InterfacesUART, I2C, SPI
ProfilesGATT Server/ GATT Client optional
Frequency2.402-2.480 GHz
Power supply1.65V-3.6V
AntennaPCB onboard antenna, supports external antenna   
Power Consumption1.6uA (Sleep Mode)
Storage Temperature-40℃ to +85℃
Operating Temperature-40℃ to +85℃

Firmware Options

Firmware No.ApplicationProfiles Support
FSC-BT691DataGATT Server
FSC-BT691DataGATT Client

Read/write module parameters

  • In the AT command state, the parameters of the module can be read and written through the AT command
  • Device name, PIN code, baud rate, MAC address are the most commonly used parameters in the application, please refer to the instruction manual for details
  • Interaction example of read and write parameters:


DatasheetFSC-BT691 Datasheet V1.5 EN.pdfMarch 31, 2022
Programming User GuideFSC-BT6XX Programming User Guide V3.0(BLE).pdfMarch 31, 2022
Dimensions11.9 × 10 × 2.0 mm
Shopping Cart
DA14531 Bluetooth Slave 5.1 Serial Port ModuleFSC-BT691 Dialog DA14531 Bluetooth Low Energy BLE 5.1 Transceiver Module
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