Bluegiga BT121 Bluetooth® Smart Ready Module

Connectivity to Both Bluetooth BR/EDR and Smart Devices

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. BT121 integrates a high performance Bluetooth radio, a low-power ARM® Cortex® microcontroller and a Bluegiga Bluetooth Smart Ready stack software marking it extremely easy-to-use as no RF or Bluetooth software development is needed. BT121 can be used as a modem together with a separate host MCU, but applications can also be embedded into the built-in ARM Cortex MCU with the Bluegiga BGScript™ scripting language.

Module Benefits

Bluetooth Smart Ready Compatible:

  • Connectivity to both Bluetooth BR/EDR and Smart devices

On-board Applications with BGScript:

  • BoM and size savings, since no external MCU needed

Excellent RF Performance:

  • Robust and long range connectivity


  • Firmware is field upgradeable
  • Application data can be stored on the flash

Integrated Bluetooth Stack Software:

  • No Bluetooth development needed

Bluetooth and Regulatory Qualifications:

  • Proven interoperabilityMinimal qualification costs

Module Specifications


  • Bluetooth 4.1 Smart Ready compliant
  • Up to 6 x BR/EDR connections
  • Up to 7 x BLE connections1 x BR/EDR + 7 x BLE connections simultaneously
  • SPP, iAP2, HID and GATT over BR Bluetooth profiles
  • Any Bluetooth Smart profile
  • 1000 kbps throughput over SPP
  • 200 kbps throughput over iAP2
  • 100 kbps throughput over BLE

Hardware Features:

  • UART host interface
  • SPI, UART and I2C peripheral interfaces
  • GPIO and ADC
  • RTC
  • Supply voltage: 2.2 V to 3.6 V
  • Dimensions: 11.0 mm x 13.9 mm x 2.2 mm


  • Integrated antenna
  • TX Power: +12 dBm with Bluetooth BR/EDR
  • TX Power: +8 dBm with Bluetooth LE
  • RX Sensitivity: -96 dBm
  • 200-400 meter LoS range

MCU Features:

  • ARM Cortex-M0
  • 48 MHz
  • 16 kB RAM
  • 128 kB flash

Software Features:

  • Integrated Bluetooth Smart Ready Stack
  • BGAPI™ serial protocol API over UART for modem usage
  • BGLIB™ host API which implements BGAPI protocol
  • BGScript scripting language for standalone usage
  • Profile Toolkit™ for creating GATT based services


  • Temperature range: -40° C to +85°C
  • Bluetooth
  • CE
  • FCC
  • IC
  • Japan
  • South Korea

Getting Started with BT121 Bluetooth Smart Ready Module

DKBT Bluetooth Smart Ready Development Kit

The easiest way to begin development with BT121 Bluetooth Smart Ready Module is with the DKBT Bluetooth Smart Ready Development Kit.

Add to Cart

BT121 Bluetooth Smart Ready Module

Part Number Buy Module Data Sheet Development Kit TX Power (dBm) RX Sensitivity (dBm) Typical Range MCU Core Dimensions (mm)
BT121 DKBT +8/12 -96 200-400 Meters ARM Cortex-M0 11.0 x 13.9 x 2.2


Title Version Resource Type
Developing Accessories with Bluetooth Smart Presentations
Bluetooth Smart Software v.1.4 Presentation Presentations
Bluetooth Smart Technology Presentation Presentations
Bluetooth Solutions for Apple iOS Devices Presentations
Bluetooth End Product Listing Guide Presentations
BT121 Product Presentation Presentations
Bluetooth Smart Ready SDK v1.2.0-208 1.2.0-208 Software
Development Kit Design Documents Reference Designs
BT121 Range Test Results Miscellaneous
BT121 South Korea Certificate and Report Miscellaneous
BT121 FCC Test Reports Miscellaneous
BT121 IC Certificate and Test Reports Miscellaneous
RoHS II Compliance Certificate Miscellaneous
BT121 ATEX List of Components Miscellaneous
BT121 Japan Test Reports Miscellaneous
Bluetooth Smart Ready Software Bluetooth Certificate Miscellaneous
iAP Reference Application v1.1 Miscellaneous
BT121 CE Test Reports and DoC Miscellaneous
180822330 Module Label Change - RoHS Label Only Product Change Notifications (PCN)
AN1160: Project Collaboration with Simplicity Studio 0.2 Application Notes
AN0822: Simplicity Studio™ User's Guide 0.5 Application Notes
AN1121: Headless Builds with Simplicity Studio v4 0.1 Application Notes
Wireless Selector Guide 7 Brochures
Bluetooth Low Energy Ultralibrarian CAD Footprints and Symbols 1.00 Schematic and Layout Files
UG366: Device Composition Data (DCD) Configurator User's Guide 0.2 User Guides
17052273 Relocation of Singapore Test Centre and Order Fulfillment Centre, Modules Product Change Notifications (PCN)
PB 1603142 Additional assembly test ship site and trace codes for BLE113 BGM111 WT12 BT121 WF121-A WF111-A Product Change Notifications (PCN)
PB #1503301: Bluegiga for Label and Document Change Product Change Notifications (PCN)
BT121 Data Sheet 1.6 Data Sheets
AN1034: BGAPI and BGLIB SPP Server Example 1.0 Application Notes
AN1033: Cable Replacement Over BLE 1.0 Application Notes
AN1032: HID over Bluetooth BR/EDR 1.0 Application Notes
UG211: Bluetooth Smart Profile Toolkit Developer Guide 3.11 User Guides
UG212: Bluetooth Smart Ready Configuration Guide 2.0 User Guides
UG213: Bluetooth® Smart Ready Software Getting Started Guide 1.2 User Guides
UG243: DKBT Bluetooth Smart Ready Development Kit User's Guide 1.1 User Guides
QSG134: DKBT Bluetooth Smart Ready Development Kit Quick-Start Guide 0.1 Quick Start Guides
DKBT Factory Demo Walkthrough Quick Start Guides
Bluetooth Smart Ready Software API Reference Manual for BT121 1.4 Reference Manuals
Bluetooth Smart Ready Software Release Notes 3.5 Release Notes
BT121 PADS Decal Reference Designs
Wireless IoT Modules Master Errata for Shield Marking 1.0 Errata
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