Silicon Laboratories EFR32xG21 Wireless Gecko Reference Manual

EFR32xG21 Wireless Gecko
Reference Manual
The EFR32xG21 Wireless Gecko SoC is the first device in the Series 2 Wireless Gecko
Portfolio, and includes the EFR32MG21 Mighty Gecko and EFR32BG21 Blue Gecko.
The EFR32xG21 improves processing capability with a Cortex M33 core and has best in
class link budget while providing for lower active current for both the MCU and radio. The
dedicated security core (Secure Element) provides improved cryptography and hardware
security that is isolated from the main application CPU. This high performance and se-
cure multi-protocol device supports Zigbee, Thread, and Bluetooth 5.0.
The single-die solution provides industry-leading energy efficiency, processing capability,
and RF performance in a small form factor for IoT connected applications.
Core / Memory
TM
ARM Cortex M33 processor
with DSP extensions,
FPU and Trust Zone
ETM Debug Interface
Radio Transceiver
RF Frontend
I
LNA
Q
PGA
PA
Frequency
PA
Lowest power mode with peripheral operational:
EM0—Active
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Flash Program
Memory
LDMA
RAM Memory
Controller
Peripheral Reflex System
DEMOD
IFADC
AGC
Synth
MOD
EM1—Sleep
Clock Management
HF Crystal HF
Fast Startup
Oscillator RC Oscillator
RC Oscillator
EM23 HF RC
Oscillator
LF Crystal Ultra LF RC
Oscillator Oscillator RC Oscillator
32-bit bus
Serial I/O Ports
Interfaces
External
USART
Interrupts
General
I 2 C
Purpose I/O
Pin Reset
Pin Wakeup
EM2—Deep Sleep
KEY FEATURES
• 32-bit ARM® Cortex M33 core with 80
MHz maximum operating frequency
• Scalable Memory and Radio configuration
options available in QFN packaging
• Peripheral Reflex System enabling
autonomous interaction of MCU
peripherals
• Autonomous Hardware Crypto Accelerator
and True Random Number Generator
• Multiple Integrated 2.4 GHz PAs with up to
20 dBm transmit power
Energy
Management
Crypto Acceleration
Voltage
Regulator
Number Generator
Brown-Out
Detector
LF
Power-On Reset
Timers and Triggers
Timer/Counter Protocol Timer
Low Energy Timer Watchdog Timer
Real Time
Capture Counter
Back-Up Real
Time Counter
EM3—Stop
Security
True Random
Secure Debug
Authentication
Secure Element
Analog I/F
iADC
Analog
Comparator
EM4—Shutoff
Rev. 0.4