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EFR32MG21 Mighty Gecko Multiprotocol

Wireless SoC Family Data Sheet

The Mighty Gecko multiprotocol family of SoCs is part of the Wire-

less Gecko portfolio. Mighty Gecko SoCs are ideal for enabling en-

ergy-friendly multiprotocol, multiband networking for IoT devices.

The single-die solution combines an 80 MHz ARM Cortex-M33 with a high performance

2.4 GHz radio to provide an industry-leading, energy efficient wireless SoC for IoT con-

nected applications.

Mighty Gecko 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

• IoT Multi-Protocol Devices

• Lighting

• Connected Home

• Gateways and Digital Assistants

• Building Automation and Security

Timers and Triggers

32-bit bus

Peripheral Reflex System

Serial

Interfaces

I/O Ports Analog I/F

Lowest power mode with peripheral operational:

USART

External

Interrupts

General

Purpose I/O

Pin Reset

Pin Wakeup

ADC

Analog

Comparator

EM4—Shutoff

Energy

Management

Brown-Out

Detector

Voltage

Regulator

Power-On Reset

SecurityClock Management

HF Crystal

Oscillator

LF Crystal

Oscillator

RC Oscillator

EM23 HF RC

Oscillator

Crypto Acceleration

Advanced Security

Security Core

Ultra LF RC

Oscillator

Core / Memory

ARM Cortex

M33 processor

with DSP extensions,

FPU and TrustZone

ETM Debug Interface RAM Memory

LDMA

Controller

Flash Program

Memory

Real Time

Capture Counter

Timer/Counter

Low Energy Timer

Watchdog Timer

Protocol Timer

Radio Transceiver

DEMOD

AGC

IFADC

CRC

BUFC

MOD

FRC

RAC

Frequency

Synth

PGA

EM3—StopEM2—Deep SleepEM1—SleepEM0—Active

True Random

Number Generator

Fast Startup

RC Oscillator

Back-Up Real

Time Counter

RF Frontend

LNA

silabs.com | Building a more connected world. Rev. 1.0

1. Feature List

The EFR32MG21 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)

• 9.4 mA RX current at 2.4 GHz (250 kbps O-QPSK DSSS)

• 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

• -104.5 dBm sensitivity @ 250 kbps O-QPSK DSSS

• -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 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 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 × I

C interface with SMBus support

• Wide Operating Range

• 1.71 V to 3.8 V 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

• QFN32 4x4 mm Package

• 0.4 mm pitch

EFR32MG21 Mighty Gecko Multiprotocol Wireless SoC Family Data Sheet

Feature List

silabs.com | Building a more connected world. Rev. 1.0 | 2

Table of Contents

1. Feature List ................................2

2. Ordering Information ............................3

3. System Overview ..............................6

3.1 Introduction ...............................6

3.2 Radio .................................6

3.2.1 Antenna Interface ...........................6

3.2.2 Fractional-N Frequency Synthesizer .....................7

3.2.3 Receiver Architecture ..........................7

3.2.4 Transmitter Architecture .........................7

3.2.5 Packet and State Trace .........................7

3.2.6 Data Buffering.............................7

3.2.7 Radio Controller (RAC)..........................7

3.3 General Purpose Input/Output (GPIO) ......................8

3.4 Clocking ................................8

3.4.1 Clock Management Unit (CMU) .......................8

3.4.2 Internal and External Oscillators.......................8

3.5 Counters/Timers and PWM ..........................8

3.5.1 Timer/Counter (TIMER) .........................8

3.5.2 Low Energy Timer (LETIMER) .......................8

3.5.3 Real Time Clock with Capture (RTCC) ....................9

3.5.4 Back-Up Real Time Counter ........................9

3.5.5 Watchdog Timer (WDOG) .........................9

3.6 Communications and Other Digital Peripherals ...................9

3.6.1 Universal Synchronous/Asynchronous Receiver/Transmitter (USART) ..........9

3.6.2 Inter-Integrated Circuit Interface (I

C) .....................9

3.6.3 Peripheral Reflex System (PRS) ......................9

3.7 Security Features .............................10

3.7.1 Standard Security ...........................10

3.7.2 True Random Number Generator ......................10

3.8 Analog.................................10

3.8.1 Analog Comparator (ACMP) ........................10

3.8.2 Analog to Digital Converter (ADC) ......................10

3.9 Reset Management Unit (RMU) ........................10

3.10 Core and Memory ............................11

3.10.1 Processor Core ............................11

3.10.2 Memory System Controller (MSC) .....................11

3.10.3 Linked Direct Memory Access Controller (LDMA) ................11

3.11 Memory Map ..............................12

3.12 Configuration Summary ..........................13

4. Electrical Specifications ..........................14

4.1 Electrical Characteristics ..........................14

silabs.com

| Building a more connected world. Rev. 1.0 | 4

4.1.1 Absolute Maximum Ratings ........................14

4.1.2 General Operating Conditions .......................15

4.1.3 Thermal Characteristics .........................16

4.1.4 Current Consumption ..........................17

4.1.5 2.4 GHz RF Transceiver Characteristics ....................22

4.1.6 Flash Characteristics ..........................37

4.1.7 Wake Up, Entry, and Exit times .......................38

4.1.8 Oscillators ..............................39

4.1.9 GPIO Pins (3V GPIO pins) ........................44

4.1.10 Analog to Digital Converter (ADC) .....................45

4.1.11 Analog Comparator (ACMP) .......................47

4.1.12 Temperature Sense ..........................48

4.1.13 Brown Out Detectors ..........................49

4.1.14 SPI Electrical Specifications .......................51

4.1.15 I2C Electrical Specifications........................52

4.2 Typical Performance Curves .........................54

4.2.1 Supply Current ............................55

4.2.2 2.4 GHz Radio ............................57

5. Typical Connection Diagrams ........................60

5.1 Power .................................60

5.2 RF Matching Networks ...........................60

5.2.1 2.4 GHz 0 dBm Matching Network ......................60

5.2.2 2.4 GHz 10 dBm Matching Network .....................61

5.2.3 2.4 GHz 20 dBm Matching Network .....................62

5.3 Other Connections.............................62

6. Pin Definitions ..............................63

6.1 QFN32 2.4GHz Device Pinout .........................63

6.2 Alternate Function Table...........................64

6.3 Analog Peripheral Connectivity ........................65

6.4 Digital Peripheral Connectivity .........................66

7. QFN32 Package Specifications........................ 69

7.1 QFN32 Package Dimensions .........................69

7.2 QFN32 PCB Land Pattern ..........................71

7.3 QFN32 Package Marking ..........................73

8. Revision History .............................74

silabs.com

| Building a more connected world. Rev. 1.0 | 5

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