EFR32MG21 Common Specs
Zigbee and Thread Radio
- 2.4 GHz IEEE 802.15.4
- 250 kbps O-QPSK DSSS
- Excellent Receive Sensitivity:
- -104.3 dBm @ 250 kbps O-QPSK DSSS
- Programmable Output Power: +20 dBm
- Active Mode RX: 9.4 mA
- Active Mode TX: 9.9 mA @ 0 dBm
- Active Mode TX: 34.9 mA @ 10 dBm
Bluetooth® Low Energy Radio
- Compatible with Bluetooth 5, Bluetooth 5.1 and Bluetooth mesh specification
- Excellent Receive Sensitivity:
- -105 dBm sensitivity @ 125 kbps GFSK
- -97.1 dBm sensitivity @ 1 Mbps GFSK
- -94 dBm sensitivity @ 2 Mbps GFSK
- Programmable Output Power: Up to +20 dBm
- 8.8 mA RX current @ 2.4 GHz (1 Mbps GFSK)
- 9.4 mA RX current @ 2.4 GHz (250 kbps O-QPSK DSSS)
- 9.9 mA TX current @ 0 dBm output power at 2.4 GHz
- 34.9 mA TX current @ 10 dBm output power at 2.4 GHz
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)
- 2C 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
- DSP and 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 RAM
Package Options
- QFN32 (4 mm x 4 mm)
You can start developing Matter solutions using the EFR32MG21 Series 2 SoCs
Find the Right EFR32MG21 Device
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| Part Number | Pricing | MCU | Core Frequency (MHz) | Flash | RAM | Secure Vault | Cryptography | Output Power Range (dBm) | Receive Sensitivity | GPIO | RX Current (mA) | UART | USART | I²C | SPI | I²S | ADC | Comparators | Timers (16-bit) | Temperature Range ºC | Package Type | Package Size (mm) | Wireless Standards | Multiprotocol |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1K @ US$3.77 | ARM Cortex-M33 | 80 | 1024 | 96 | Base | AES-256 ECC SHA-1 SHA-2 | -20 10 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 3 | 3 | 2 | 3 | 3 | 12-bit, SAR, 1 Msps | 2 | 7 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$- | ARM Cortex-M33 | 80 | 512 | 64 | Base | AES-256 ECC SHA-1 SHA-2 | -20 10 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 3 | 3 | 2 | 3 | 3 | 12-bit, SAR, 1 Msps | 2 | 7 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$3.27 | ARM Cortex-M33 | 80 | 768 | 64 | Base | AES-256 ECC SHA-1 SHA-2 | -20 10 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 3 | 3 | 2 | 3 | 3 | 12-bit, SAR, 1 Msps | 2 | 7 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$4.32 | ARM Cortex-M33 | 80 | 1024 | 96 | Base | AES-256 ECC SHA-1 SHA-2 | -20 20 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 3 | 3 | 2 | 3 | 3 | 12-bit, SAR, 1 Msps | 2 | 7 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$3.49 | ARM Cortex-M33 | 80 | 512 | 64 | Base | AES-256 ECC SHA-1 SHA-2 | -20 20 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 3 | 3 | 2 | 3 | 3 | 12-bit, SAR, 1 Msps | 2 | 7 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$3.81 | ARM Cortex-M33 | 80 | 768 | 64 | Base | AES-256 ECC SHA-1 SHA-2 | -20 20 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 3 | 3 | 2 | 3 | 3 | 12-bit, SAR, 1 Msps | 2 | 7 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$4.09 | ARM Cortex-M33 | 80 | 1024 | 96 | High | AES-128 AES-256 ECC SHA-1 SHA-2 | -20 10.5 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 0 | 3 | 2 | 0 | 3 | 12-bit, SAR, 1 Msps | 2 | 2 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$- | ARM Cortex-M33 | 80 | 512 | 64 | High | AES-128 AES-256 ECC SHA-1 SHA-2 | -20 10.5 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 0 | 3 | 2 | 0 | 3 | 12-bit, SAR, 1 Msps | 2 | 2 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$3.57 | ARM Cortex-M33 | 80 | 768 | 64 | High | AES-128 AES-256 ECC SHA-1 SHA-2 | -20 10.5 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 0 | 3 | 2 | 0 | 3 | 12-bit, SAR, 1 Msps | 2 | 2 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$4.64 | ARM Cortex-M33 | 80 | 1024 | 96 | High | AES-128 AES-256 ECC SHA-1 SHA-2 | -20 20 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 0 | 3 | 2 | 0 | 3 | 12-bit, SAR, 1 Msps | 2 | 2 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$3.81 | ARM Cortex-M33 | 80 | 512 | 64 | High | AES-128 AES-256 ECC SHA-1 SHA-2 | -20 20 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 0 | 3 | 2 | 0 | 3 | 12-bit, SAR, 1 Msps | 2 | 2 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$4.13 | ARM Cortex-M33 | 80 | 768 | 64 | High | AES-128 AES-256 ECC SHA-1 SHA-2 | -20 20 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 0 | 3 | 2 | 0 | 3 | 12-bit, SAR, 1 Msps | 2 | 2 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic | |
| 1K @ US$2.62 | ARM Cortex-M33 | 80 | 512 | 64 | Mid | AES-128 AES-256 ECC SHA-1 SHA-2 | -20 20 | -104.3 (250 kbps O-QPSK DSSS) | 20 | 9.4 | 0 | 3 | 0 | 0 | 3 | 12-bit, SAR, 1 Msps | 0 | 3 | -40 125 | QFN32 | 4x4 | Thread Zigbee Bluetooth | Switched Programmable Dynamic |
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EFR32xG21 Wireless Gecko Starter Kit
The EFR32xG21 Wireless Gecko Starter Kit (SLWSTK6006A) includes everything needed to enable developers to create a mesh network and evaluate the EFR32xG21A with Secure Element and the EFR32xG21B with Secure Vault Series 2 Wireless Gecko SoCs. This kit provides the common baseboard and comes with 6 xG21A modules (SLWRB418xA). If you want to evaluate the EFR32xG21B you must buy the xG21B modules (SLWRB4181C +10 dBm) separately.
EFR32xG21 Wireless Gecko Starter Kit
The EFR32xG21 Wireless Gecko Starter Kit (SLWSTK6006A) includes everything needed to enable developers to create a mesh network and evaluate the EFR32xG21A with Secure Element and the EFR32xG21B with Secure Vault Series 2 Wireless Gecko SoCs. This kit provides the common baseboard and comes with 6 xG21A modules (SLWRB418xA). If you want to evaluate the EFR32xG21B you must buy the xG21B modules (SLWRB4181C +10 dBm) separately.
EFR32xG21 Wireless 2.4 GHz Pro Kit +20 dBm
The EFR32xG21 Pro Kit, xG21-PK6027A, is designed to support the development of wireless IoT devices based on the EFR32xG21 Rev D +20 dBm SoC and support the development of wireless protocols including Bluetooth LE, Bluetooth Mesh, Thread (for Matter) and Zigbee.
EFR32xG21 Wireless 2.4 GHz Pro Kit +20 dBm
The EFR32xG21 Pro Kit, xG21-PK6027A, is designed to support the development of wireless IoT devices based on the EFR32xG21 Rev D +20 dBm SoC and support the development of wireless protocols including Bluetooth LE, Bluetooth Mesh, Thread (for Matter) and Zigbee.
EFR32xG21 Wireless 2.4 GHz Pro Kit +10 dBm
The EFR32xG21 Pro Kit, xG21-PK6026A, is designed to support the development of wireless IoT devices based on the EFR32xG21B Rev D +10 dBm SoC and support the development of wireless protocols including Bluetooth LE, Bluetooth Mesh, Thread (for Matter) and Zigbee.
EFR32xG21 Wireless 2.4 GHz Pro Kit +10 dBm
The EFR32xG21 Pro Kit, xG21-PK6026A, is designed to support the development of wireless IoT devices based on the EFR32xG21B Rev D +10 dBm SoC and support the development of wireless protocols including Bluetooth LE, Bluetooth Mesh, Thread (for Matter) and Zigbee.
EFR32xG21B Rev D Wireless 2.4 GHz +10 dBm Radio Board
The EFR32xG21B Rev D +10 dBm SoC Radio Board, xG21-RB4195B, is designed work with the Wireless Pro Kit Mainboard (not included) to support the development of wireless IoT devices based on 2.4 GHz wireless protocols including Bluetooth LE, Bluetooth Mesh, Thread (for Matter) and Zigbee.
EFR32xG21B Rev D Wireless 2.4 GHz +10 dBm Radio Board
The EFR32xG21B Rev D +10 dBm SoC Radio Board, xG21-RB4195B, is designed work with the Wireless Pro Kit Mainboard (not included) to support the development of wireless IoT devices based on 2.4 GHz wireless protocols including Bluetooth LE, Bluetooth Mesh, Thread (for Matter) and Zigbee.
EFR32xG21B Rev D Wireless 2.4 GHz +20 dBm Radio Board
The EFR32xG21B Rev D +20 dBm SoC Radio Board, xG21-RB4196B, is designed work with the Wireless Pro Kit Main board (not included) to support the development of wireless IoT devices based on 2.4 GHz wireless protocols including Bluetooth LE, Bluetooth Mesh, Thread (for Matter) and Zigbee.
EFR32xG21B Rev D Wireless 2.4 GHz +20 dBm Radio Board
The EFR32xG21B Rev D +20 dBm SoC Radio Board, xG21-RB4196B, is designed work with the Wireless Pro Kit Main board (not included) to support the development of wireless IoT devices based on 2.4 GHz wireless protocols including Bluetooth LE, Bluetooth Mesh, Thread (for Matter) and Zigbee.
EFR32xG21B Wireless Gecko 2.4 GHz +10 dBm Radio Board with Secure Vault
The Wireless Gecko SLWRB4181C wireless radio board plugs into the Main Board provided with the EFR32xG21 Wireless Gecko Starter Kit or the EFR32xG21 Bluetooth Starter Kit and must be purchased separately from either of those kits. The starter kits include access to Zigbee, Thread, and Bluetooth software stacks with the highest level of IoT security provided by Secure Vault.
EFR32xG21B Wireless Gecko 2.4 GHz +10 dBm Radio Board with Secure Vault
The Wireless Gecko SLWRB4181C wireless radio board plugs into the Main Board provided with the EFR32xG21 Wireless Gecko Starter Kit or the EFR32xG21 Bluetooth Starter Kit and must be purchased separately from either of those kits. The starter kits include access to Zigbee, Thread, and Bluetooth software stacks with the highest level of IoT security provided by Secure Vault.
EFR32xG21A Wireless Gecko 2.4 GHz +10 dBm Radio Board
The Wireless Gecko SLWRB4181B wireless radio board plugs into the Main Board provided with the Wireless Gecko Starter Kit. The starter kit includes access to Zigbee, Thread, and Bluetooth software stacks.
EFR32xG21A Wireless Gecko 2.4 GHz +10 dBm Radio Board
The Wireless Gecko SLWRB4181B wireless radio board plugs into the Main Board provided with the Wireless Gecko Starter Kit. The starter kit includes access to Zigbee, Thread, and Bluetooth software stacks.
EFR32xG21A Wireless Gecko 2.4 GHz +20 dBm Radio Board
The Wireless Gecko SLWRB4180B wireless radio board plugs into the Main Board provided with the Wireless Gecko Starter Kit. The starter kit includes access to Zigbee, Thread, and Bluetooth software stacks.
EFR32xG21A Wireless Gecko 2.4 GHz +20 dBm Radio Board
The Wireless Gecko SLWRB4180B wireless radio board plugs into the Main Board provided with the Wireless Gecko Starter Kit. The starter kit includes access to Zigbee, Thread, and Bluetooth software stacks.
EFR32xG21 Bluetooth Starter Kit
The EFR32xG21 Bluetooth Starter Kit supports Bluetooth 5.1 and comes ready to connect to your phone via the Silicon Labs Bluetooth LE mobile app. This Kit comes with an EFR32xG21A with Secure Element 2.4 GHz wireless SOC is optimized for line-powered BLE and Bluetooth mesh applications, including connected lighting, smart plugs, gateways, and voice assistants. Optionally, if you want to evaluate the EFR32xG21B with Secure Vault, you can purchase an xG21B module (SLWRB4181C +10 dBm) separately.
EFR32xG21 Bluetooth Starter Kit
The EFR32xG21 Bluetooth Starter Kit supports Bluetooth 5.1 and comes ready to connect to your phone via the Silicon Labs Bluetooth LE mobile app. This Kit comes with an EFR32xG21A with Secure Element 2.4 GHz wireless SOC is optimized for line-powered BLE and Bluetooth mesh applications, including connected lighting, smart plugs, gateways, and voice assistants. Optionally, if you want to evaluate the EFR32xG21B with Secure Vault, you can purchase an xG21B module (SLWRB4181C +10 dBm) separately.