Silicon Labs

Bluetooth Wireless SoC

Bringing high performance, low power and secure solutions to the Internet of Things
Bluetooth Wireless SoC
Wireless Gecko Series 2 devices are the next evolution of Wireless Gecko devices that are designed to increase processing capability, improve RF performance and lower active current, while providing a higher level of security.

The first family of devices in Series 2 are EFR32BG21, a 2.4 GHz wireless SOC optimized for line-powered BLE and Bluetooth mesh applications, including connected lighting, smart plugs, gateways and voice assistants. An 80 MHz ARM® Cortex®-M33 core provides plenty of processing capability while a dedicated security core that provides faster encryption, secure boot loading, and debug access control. With better than -104 sensitivity for Bluetooth Long Range and up to +20 dBm output power, the EFR32BG21 provides a robust RF link to ensure reliable communications. And finally the Series 2 uses the same tools as Series 1, providing easy migration and fast time-to-market with development kits, SDKs, mobile apps, and Silicon Labs patented network analyzer.

Module Specifications

Bluetooth Low Energy Radio
  • Compatible With Bluetooth 5, Bluetooth 5.1 and Bluetooth mesh specification
  • Excellent Receive Sensitivity:
  • 105.1 dBm @ 125 kbps GFSK to -104.9 dBm @125 kbps GFSK
  • 97.5 dBm @1 Mbps GFSK
  • 94.4 dBm @2 Mbps GFSK
  • Programmable Output Power: Up to +20 dBm
  • Active Mode RX: 8.8 mA
  • Active Mode TX: 10.5 mA @ 0 dBm to Active Mode TX: 9.8 mA @0 dBm
  • Active Mode TX: 33.1 mA @ 10 dBm to Active Mode TX: 33.8 mA @ 10 dBm

Rich Analog and Digital Peripherals
  • 12-bit 1 Msps SAR Analog to Digital Converter (ADC)
  • Analog Comparators (ACMP)
  • 8 Channel DMA Controller
  • Peripheral Reflex System (PRS)
  • PTA (Packet Traffic Arbitration) for Wi-Fi Coexistence
  • 16-bit Timer/Counters
  • 3 Compare/Capture/PWM channels per Timer
  • 32-bit Timer/Counter
  • 3 Compare/Capture/PWM channels per Timer
  • 32-bit Real Time Counter
  • 24-bit Low Energy Timer for waveform generation
  • Watchdog Timers
  • Universal Synchronous/Asynchronous Receiver/Transmitter (UART/SPI/SmartCard(ISO 7816)/IrDA/I2S)
  • I2C interface with SMBus support
  • Up to 20 General Purpose I/O pins
  • Output state retention and asynchronous interrupts

Powerful MCU & Memory Options
  • ARM® Cortex®-M33
  • Floating Point Unit
  • Up to 80 MHz Clock Speed
  • Low Active Mode Current: 50.9 µA/MHz
  • Up to 1024 kB of Programmable Flash
  • Up to 96 kB SRAM

Package Options
  • QFN32 (4 mm x 4 mm)

  • Hardware Cryptographic Acceleration
  • AES (128/192/256), SHA-1, SHA-2 (SHA-224/SHA256), ECC (256-bit), ECDSA (256-bit) and ECDH (p192, p256), HMAC, J-PAKE
  • True Random Number Generator (TRNG)
  • Secure Boot
  • Secure Debug / Debug Access Control
  • Unique ID

*Silicon Labs Authorized Distributor
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