BGM123 EFR32BG1 Series 1 Bluetooth® Module - SiP

The World’s Smallest Bluetooth SiP Module

Silicon Labs’ BGM123 SiP Bluetooth Module has +3 dBm TX power is targeted for applications where ultra-small size, reliable high performance RF, low-power consumption and easy application development are key requirements. At 6.5 x 6.5 x 1.4 mm the BGM121 module fits applications where size is a constraint. BGM123 also integrates a high performance, ultra robust antenna, which requires minimal PCB, plastic and metal clearance. The total PCB area required by BGM123 is only 51 mm². The BGM123 also integrates a Bluetooth 4.2 compliant Bluetooth stack and it can also run end-user applications on-board or alternatively used as a network co-processor over one of the host interfaces.

Module Benefits

Integrated Bluetooth Radio and Antenna:

  • Excellent RF performance
  • Integrated hugh performance antenna
  • Fast time-to-market and low R&D costs

Bluetooth and regulatory certifications:

  • Minimal end product certification
  • Faster time-to-market
  • Proven platform

Pre-assembled and pre-tested platform:

  • Modules are pre-assembled
  • Radio is pre-tested
  • Firmware is pre-installed

Module Specifications


  • Bluetooth 4.2 compliant
  • Bluetooth 5 advertising

Low Power Wireless System-on-Chip:

  • High Performance 32-bit 38.4 MHz ARM® Cortex®-M4 with DSP instruction and floating-point unit for efficient signal processing
  • 256 kB flash program memory
  • 32 kB RAM data memory
  • 2.4 GHz radio operation
  • 3 dBm TX power

Low Energy Consumption:

  • 9.0 mA RX current at 2.4 GHz
  • 8.2 mA TX current @ 0 dBm output power at 2.4 GHz
  • 63 μA/MHz in Active Mode (EM0)
  • 2.5 μA EM2 DeepSleep current (full RAM retention and RTCC running from LFXO)
  • 2.1 μA EM3 Stop current (State/RAM retention)
  • Wake on Radio with signal strength detection, preamble pattern detection, frame detection and timeout

High Receiver Performance:

  • -90 dBm sensitivity @ 1 Mbit/s GFSK (2.4 GHz)

Wide Operating Range:

  • 1.85 V to 3.8 V single power supply
  • 2.4 V to 3.8 V when using DC-DC
  • Integrated DC-DC
  • -40 °C to +85 °C

Support for Internet Security:

  • General Purpose CRC
  • Random Number Generator
  • Hardware Cryptographic Acceleration for AES 128/256, SHA-1, SHA-2 (SHA-224 and SHA-256) and ECC


  • 6.5 mm x 6.5 mm x 1.4 mm

Wide Selection of MCU peripherals:

  • 12-bit 1 Msps SAR Analog to Digital Converter (ADC)
  • 2 × Analog Comparator (ACMP)
  • Digital to Analog Current Converter (IDAC)
  • 32 pins connected to analog channels (APORT) shared between Analog Comparators, ADC, and IDAC32 General Purpose I/O pins with output state retention and asynchronous interrupts
  • 8 Channel DMA Controller
  • 12 Channel Peripheral Reflex System (PRS)
  • 2 × 16-bit Timer/Counter
  • 3 + 4 Compare/Capture/PWM channels
  • 32-bit Real Time Counter and Calendar
  • 16-bit Low Energy Timer for waveform generation
  • 32-bit Ultra Low Energy Timer/Counter for periodic wake-up from any Energy Mode
  • 16-bit Pulse Counter with asynchronous operation
  • Watchdog Timer w/ dedicated RC oscillator @ 50 nA
  • 2 × Universal Synchronous/Asynchronous Receiver/Transmitter (UART/SPI/SmartCard (ISO 7816)/IrDA/I²S)
  • Low Energy UART (LEUART™)
  • I²C interface with SMBus support and address recognition in EM3 Stop

Getting Started with BGM123 SiP Bluetooth Module

EFR32BG1 Series 1 SiP Bluetooth Starter Kit

The easiest way to begin development with BGM123 EFR32BG1 Series 1 SiP Bluetooth Module is with the Bluetooth Module Starter Kit.

Add to Cart

BGM123 Modules

Part Number Buy  Data Sheet Antenna Package BLE Bluetooth 5 Range (m) Dimensions (mm) TX Power (dBm) RX Sensitivity (dBm) MCU Core RAM (kB) Flash (kB)
BGM123A256V2 PDF icon Internal Tray Yes Advertising 50 6.5 x 6.5 x 1.4 
+3 -90 ARM Cortex-M4 32 256
BGM123A256V2R PDF icon Internal Reel Yes Advertising
50 6.5 x 6.5 x 1.4 
+3 -90 ARM Cortex-M4
32 256
BGM123N256V2 PDF icon RF Pad Tray Yes Advertising
50 6.5 x 6.5 x 1.4 
+3 -90 ARM Cortex-M4
32 256
BGM123N256V2R PDF icon RF Pad Reel Yes
50 6.5 x 6.5 x 1.4 
+3 -90 ARM Cortex-M4
32 256

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