EFR32BG21B Gecko Wireless SoC Family
Data Sheet
The EFR32BG21B SoC is part of the Wireless Gecko portfolio.
EFR32BG21B SoCs are ideal for enabling energy-friendly Blue-
tooth 5 networking for IoT devices.
The single-die solution combines an 80
MHz ARM Cortex-M33 a high performance 2.4
GHz radio, and an integrated Secure Vault to provide a highly secure, energy efficient
wireless SoC for IoT connected applications.
EFR32BG21B applications include:
KEY FEATURES
• 32-bit ARM® Cortex®-M33 core with 80
MHz maximum operating frequency
• Up to 1024
kB of flash and 96 kB of RAM
• 12-channel Peripheral Reflex System
enabling autonomous interaction of MCU
peripherals
• Integrated PA with up to 20 dBm (2.4
GHz) TX power
• Robust peripheral set and up to 20 GPIO
in a 4x4 QFN package
• Lighting
•
Connected Home
•
Gateways and Digital Assistants
• Building Automation and Security
Secure Vault
Secure Debug
Authentication
Timers and Triggers
32-bit bus
Peripheral Reflex System
Serial
Interfaces
I/O Ports Analog I/F
Lowest power mode with peripheral operational:
USART
I
2
C
External
Interrupts
General
Purpose I/O
Pin Reset
Pin Wakeup
IADC
Analog
Comparator
EM4—Shutoff
Energy
Management
Brown-Out
Detector
Voltage
Regulator
Power-On Reset
Clock Management
HF Crystal
Oscillator
LF Crystal
Oscillator
LF
RC Oscillator
HF
RC Oscillator
EM23HFRC
Oscillator
Crypto Acceleration
Anti-Tamper
Ultra LF RC
Oscillator
Core / Memory
ARM Cortex
TM
M33 processor
with DSP extensions,
FPU and TrustZone
ETM Secure Debug RAM Memory
LDMA
Controller
Flash Program
Memory
Real Time
Capture Counter
Timer/Counter
Low Energy Timer
Watchdog Timer
Protocol Timer
EM3—StopEM2—Deep SleepEM1—SleepEM0—Active
True Random
Number Generator
Fast Startup
RC Oscillator
Back-Up Real
Time Counter
Radio Transceiver
DEMOD
AGC
IFADC
CRC
BUFC
MOD
FRC
RAC
Frequency
Synth
PGA
RF Frontend
I
Q
PA
LNA
PA
EUI
Secure Boot with
Root of Trust and
Secure Loader
DPA
Countermeasures
silabs.com | Building a more connected world. Rev. 0.5
1. Feature List
The EFR32BG21B highlighted features are listed below.
• Low Power Wireless System-on-Chip
•
High Performance 32-bit
80 MHz ARM Cortex
®
-M33 with
DSP instruction and floating-point unit for efficient signal
processing
• Up to 1024 kB flash program memory
• Up to 96 kB RAM data memory
• 2.4 GHz radio operation
• TX power up to 20 dBm
• Low Energy Consumption
• 8.8 mA RX current at 2.4 GHz (1 Mbps GFSK)
• 9.3 mA TX current @ 0 dBm output power at 2.4 GHz
• 33.8 mA TX current @ 10 dBm output power at 2.4 GHz
• 50.9 μA/MHz in Active Mode (EM0)
• 5.0 μA EM2 DeepSleep current
(96 kB RAM retention and RTC running from LFXO)
• 4.5 μA EM2 DeepSleep current
(16 kB RAM retention and RTC running from LFRCO)
• High Receiver Performance
• -97.5 dBm sensitivity @ 1 Mbit/s GFSK
• -94.4 dBm sensitivity @ 2 Mbit/s GFSK
• -104.9 dBm sensitivity @ 125 kbps GFSK
• Supported Modulation Format
• GFSK
• Protocol Support
• Bluetooth Low Energy (Bluetooth 5)
• Wide selection of MCU peripherals
•
12-bit 1 Msps SAR Analog to Digital Converter (ADC)
• 2 × Analog Comparator (ACMP)
• Up to 20 General Purpose I/O pins with output state reten-
tion and asynchronous interrupts
• 8 Channel DMA Controller
• 12 Channel Peripheral Reflex System (PRS)
• 2 × 16-bit Timer/Counter
• 3 Compare/Capture/PWM channels
• 1 × 32-bit Timer/Counter
• 3 Compare/Capture/PWM channels
• 32-bit Real Time Counter
• 24-bit Low Energy Timer for waveform generation
• 2 × Watchdog Timer
• 3 × Universal Synchronous/Asynchronous Receiver/Trans-
mitter (UART/SPI/SmartCard(ISO 7816)/IrDA/I
2
S)
•
2 × I
2
C interface with SMBus support
• Wide Operating Range
• 1.71 V to 3.8 V single power supply
• -40°C to 125°C ambient
• Secure Vault
• Hardware Cryptographic Acceleration for AES128/192/256,
ChaCha20-Poly1305, SHA-1, SHA-2/256/384/512, ECDSA
+ECDH(P-192, P-256, P-384, P-521), Ed25519 and
Curve25519, J-PAKE, PBKDF2
• True Random Number Generator (TRNG)
• ARM® TrustZone®
• Secure Boot (Root of Trust Secure Loader)
• Secure Debug Unlock
• DPA Countermeasures
• Secure Key Management with PUF
• Anti-Tamper
• Secure Attestation
• QFN32 4x4 mm Package
• 0.4 mm pitch
EFR32BG21B Gecko Wireless SoC Family Data Sheet
Feature List
silabs.com | Building a more connected world. Rev. 0.5 | 2