BT680T, Bluetooth 5 Module, Long Range, Automobile Temperature




BT680T module uses Toshiba TC35681 SoC. It operates in automobile temperature range. A host MCU controls module using HCI commands over UART interface. Bluetooth range is 3000 meters or 125 Kbps when measured in environments with Low Multiple Path Interference. 

Model Variants

BT680F summaries.png

BT680F: User’s application is stored in on-board flash and loaded into on-board RAM at booting-up for standalone operation. Fanstel’s AT command code is preloaded for legacy MCUs to upgrade to Bluetooth 5 features and longer range. Or, user can load other application codes.

BT680E offers the same features as BT680F. An u.FL connector for external antenna is installed instead of the integrated PCB trace antenna in BT680F.

BT680T operates in automobile temperature range. A host MCU sends HCI commands over UART interface to control module. With an external serial EEPROM, BT680T can operate in standalone mode.

BT680K offers the same features as BT680T except working in industrial, not automobile temperature range.

Bluetooth 5 Specifications

Three key features of Bluetooth 5 specs for Bluetooth 5 products:

  1. 2X bandwidth to support 2Mbps data rate.

  2. 4X range to provide coverage of an entire home or building.

  3. 8X broadcasting message length from 31 bytes to 255 bytes.

Bluetooth SIG CORE_v5.0 LE CODED PHY uses FEC (Forward Error Correction) codes, 8 or 2 symbols to represent 1 data bit, and 1 M Symbols per second (MSps) transmission rate. Effectively, the maximum data rate is 125 kbps when 8 symbols are used. This FEC coding allows receivers to receive much weaker signals and to increase range by 4 times.

Mesh Network

BT680T with Bluetooth mesh stacks can be used with available WiFi to BLE gateway or BLE 5 USB dongle to connect to an IoT Cloud server.

Using BlueFan Bluetooth 5 modules in Bluetooth 5 mesh networks

Using BlueFan Bluetooth 5 modules in Bluetooth 5 mesh networks


  • Standalone or used with a host MCU by UART interface/HCI Commands

  • Bluetooth SIG certified BLE 5 stacks embedded in mask-ROM.

  • Toshiba SOC, built-in Cortex M0 processor

  • Masked-ROM: 240KB

  • RAM: 144KB

  • Flash: 128KB

  • Bluetooth RF analog core, baseband digital core and integrated antenna

  • TX power: +8 dBm

  • Receiver sensitivity at 1Mbps: -96.5 dBm

  • Receiver sensitivity at 125 Kbps (coded PHY): -107 dBm

  • Size: 15x20.8x1.9mm

  • Bluetooth range: 900 meters at 125 Kbps, estimated.

  • Bluetooth range: 450 meters at 1Mbps, estimated.

  • Secure connection

  • Bluetooth Low Energy (BLE) V5 GATT profile with OTA (Over The Air) support.

  • Up to 17 General Purpose IOs to be configured by firmware:

    • SPI interface, I2C interface

    • UART interface, 9600bps to 921.6 Kbps

    • Up to 2 wake up interfaces

    • Up to 6 ADC channels (1 for internal monitoring of VDD).

    • Up to 4 PWM channels

  • On board 26 MHz main clock

  • External 32.768 kHz sleep clock

  • Operation voltage: 2.0V-3.6V

  • Peak current consumption, 11 mA; deep sleep mode, <0.1uA

  • Integrated PCB trace antenna,

  • Operation Temperature: -40oC to +125oC

  • Needs an external serial EEPROM.

  • Hybrid Castellated and LGA, 40 pins: pins. Easier prototyping, easier production.

  • Integrated shield to resist EMI

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For volume discount and production lead time, please email Fanstel