Silicon Labs Bluegiga Wireless Module - BT121 is Bluetooth 4.1 Smart Ready compliant. It is a long range dual-mode module supporting master as well as slave mode. BT121 can provide connectivity to Bluetooth Smart as well as Classic devices simultaneously. Therefore BT121 can be used as a bridge between the BLE and Classic devices. BT121 can be used universally since it can provide connectivity to Windows XP, 7 and 8, OSX and Linux. BT121 integrates high performance Bluetooth radio, low power ARM Cortex MCU & Bluetooth Smart Ready Stack making it capable of using as a standalone unit. It can be used as a modem with separate MCU as well.
BT121 is a Bluetooth Smart Ready module targeted for applications that require both Bluetooth Smart and Classic connectivity. It can connect to legacy devices that only support Bluetooth SPP or Apple iAP2 profiles as well to devices that support Bluetooth Smart.


  • Bluetoothv.4.1 dual mode:
  • Low Current Consumption
  • IntegratedBluetoothSmart Ready stack
  • Flexible Peripheral Interfaces
  • - 12-bit ADC and DAC
  • Host Interfaces:
  • - UART
  • Compact Size:
  • - 11.0 mm x 13.9 mm x 2.2 mm
  • - 153 mm2
  • RTC with calendar alarms*
  • Programmable ARM Cortex-M0 processor:
  • - 16kb RAM / 256 kB Flash
  • Bluetooth, CE, FCC, IC, South-Korea and Japan qualified
  • *Apple MFI license required
  • Radio features:
  • Integrated antenna
  • TX Power
  • +12 dBm with Bluetooth BR/EDR
  • +8 dBm with Bluetooth LE
  • RX Sensitivity
  • -96 dBm
  • 200-400 meter LoS range

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