Silicon Labs EFR32MG21 Mighty Gecko Series 2 Wireless SoCs

Silicon Labs EFR32MG21 Mighty Gecko Series 2 Multiprotocol Wireless SoCs offer an 80MHz ARM Cortex-M33 core with a dedicated security core that provides faster encryption, secure boot loading, and debug access control. The EFR32MG21 are designed to increase processing capability, improve RF performance, and lower active current, while providing a higher level of security.

The EFR32MG21 features 512kB, 768kB, and 1024kB Flash, 64kB or 96kB RAM, and is available in a QFN32 package. The SoCs provide Bluetooth 5, Zigbee, and thread protocol stacks. Additionally, the EFR32MG21 has an integrated PA with up to 20dBm (2.4GHz) TX power.

The EFR32MG21 features a 12-channel Peripheral Reflex System enabling autonomous interaction of MCU peripherals. The EFR32MG21 SoCs provide enhanced security features that enable developers to implement robust security in connected products. The devices are ideal for IoT multi-protocol devices, lighting, connected homes, gateways, digital assistants, building automation, and security applications.

Silicon Labs' Wireless Gecko Series 2 platform takes advantage of Secure Vault by combining best-in-class security software features with physically unclonable function (PUF) hardware technology to greatly reduce the risk of IoT security breaches and compromised intellectual property.

Secure Vault's hardware features provide an optimized level of security implemented in a cost-effective, wireless SoC solution. The security subsystem, including a dedicated core, bus, and memory, is separate from the host processor. This unique design of hardware separation isolates critical features, such as secure key store management and cryptography, into their own functional areas, making the overall device more secure.

Secure Vault delivers new security features, including:
• Secure Device Identity
• Secure Key Management and Storage
• Advanced Tamper Detection

Press Release New Silicon Labs Secure Vault Technology Redefines IoT Device Security

Features

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 1024kB flash program memory
- Up to 96kB RAM data memory
- 2.4 GHz radio operation
- TX power up to 20dBm
Low Energy Consumption
- 8.8mA RX current at 2.4GHz (1Mbps GFSK)
- 9.4mA RX current at 2.4GHz (250kbps O-QPSK DSSS)
- 9.3mA TX current @ 0dBm output power at 2.4GHz
- 33.8mA TX current @ 10dBm output power at 2.4GHz
- 50.9μA/MHz in Active Mode (EM0)
- 5.0μA EM2 DeepSleep current (96kB RAM retention and RTC running from LFXO)
- 4.5μA EM2 DeepSleep current (16 kB RAM retention and RTC running from LFRCO)
High Receiver Performance
- -104.5dBm sensitivity @ 250kbps O-QPSK DSSS
- -97.5dBm sensitivity @ 1Mbit/s GFSK
- -94.4dBm sensitivity @ 2Mbit/s GFSK
- -104.9dBm sensitivity @ 125kbps GFSK
Supported Modulation Formats
- GFSK
- OQPSK
Protocol Support
- BLUETOOTH® Low Energy (Bluetooth 5)
- Zigbee
- Thread

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 retention 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/transmitter (UART/SPI/SmartCard (ISO 7816)/IrDA/I²S)
- 2× I²C interface with SMBus support
Wide Operating Range
- 1.71V to 3.8V single power supply
- -40°C to +125°C ambient
Standard Security
- Hardware Cryptographic Acceleration for AES128/256, SHA-1, SHA-2 (up to 256-bit), ECC (up to 256-bit), ECDSA (up to 256-bit), ECDH, and J-Pake
- True Random Number Generator (TRNG)
- ARM TrustZone
- Secure boot
- Secure debug unlock

Benefits:
• Excellent RF performance with +20dBm output power and up to +124.5dB link budget
• Robust wireless radio with improved blocking performance
• Powerful processing with an 80MHz Arm^® Cortex^®-M33 core with TrustZone technology
• Low active current (50.9µA/MHz) to meet stringent green energy requirements, a benefit of manufacturing on low-power 40nm process technology
• Small multiprotocol SoCs in a 4mm x 4mm QFN package
• Lower BOM count and system cost with fewer matching components and no need for external inductors or power amplifiers

Secure Design Features
• A dedicated security core enables faster, lower-power encryption than software techniques
• A true random number generator (TRNG) strengthens device cryptography
• Secure boot loading ensures authenticity of firmware images and over-the-air updates
• Secure debug access control helps OEMs prevent unauthorized access to end products