EFM32™ Giant Gecko GG11 Series 1 32-bit Microcontroller

The most integrated and high performance low power MCU available

Silicon Labs' EFM32™ Giant Gecko Series 1 ARM® Cortex®-M4 based 32-bit microcontrollers (MCUs) provides robust security via a unique cryptographic hardware engine supporting AES, ECC, SHA, and True Random Number Generator (TRNG). New features include an SD/MMC/SDIO controller, Octal/ Quad-SPI memory controller, 10/100 Ethernet MAC, dual CAN bus controller, highly robust capacitive sensing, enhanced alpha blending graphics engine, and LESENSE/PCNT enhancements for smart energy meters. These features, combined with ultra-low current active mode and short wake-up time from energy-saving modes, make EFM32GG11 microcontrollers well suited for any battery-powered application, as well as other systems requiring high performance and low-energy consumption.


ARM Cortex-M4 CPU platform

  • High performance 32-bit processor @ up to 72 MHz
  • DSP instruction support and Floating Point Unit
  • Memory Protection Unit
  • Wake-up Interrupt Controller

Flexible Energy Management System

  • 77 μA/MHz in Active Mode (EM0)
  • 1.6 μA EM2 Deep Sleep current (16 kB RAM retention and RTCC running from LFRCO)

Integrated DC-DC buck converter

Up to 2048 kB flash program memory

  • Dual-bank with read-while-write support

Up to 512 kB RAM data memory

  • 256 kB with ECC (SEC-DED)

Octal/Quad-SPI Flash Memory Interface

  • Supports 3 V and 1.8 V memories
  • 1/2/4/8-bit data bus
  • Quad-SPI Execute In Place (XIP)
  • Up to 30 MHz SDR/DDR at 3 V

Communication Interfaces

  • Low-energy Universal Serial Bus (LEUSB) with Device, Host, and OTG support
    • Fully USB 2.0 compliant
    • On-chip PHY and embedded 5 V to 3.3 V regulator
    • Crystal-free Device mode operation
    • Patent-pending Low-Energy Mode (LEM)
  • SD/MMC/SDIO Host Controller
    • SD v3.01, SDIO v3.0 and MMC v4.51 up to 50 MHz
    • 1/4/8-bit bus width
  • 10/100 Ethernet MAC with MII/RMII interface
    • IEEE1588-2008 precision time stamping
    • Energy Efficient Ethernet (802.3az)
  • Up to 2× CAN Bus Controller
    • Version 2.0 A and 2.0 B up to 1 Mbps
  • 6× Universal Synchronous/Asynchronous Receiver/ Transmitter
    • UART/SPI/SmartCard (ISO 7816)/IrDA/I2S/LIN
    • Triple buffered full/half-duplex operation with flow control
    • Ultra high speed (36 MHz) operation on one instance
  • 2× Universal Asynchronous Receiver/ Transmitter
  • 2× Low Energy UART
    • Autonomous operation with DMA in Deep Sleep Mode
  • 3 × I²C Interface with SMBus support
    • Address recognition in EM3 Stop Mode

Up to 144 General Purpose I/O Pins

  • Configurable push-pull, open-drain, pull-up/down, input filter, drive strength
  • Configurable peripheral I/O locations
  • 5 V tolerance on select pins
  • Asynchronous external interrupts
  • Output state retention and wake-up from Shutoff Mode

Up to 24 Channel DMA Controller

Up to 24 Channel Peripheral Reflex System (PRS) for autonomous inter-peripheral signaling

External Bus Interface for up to 4 x 256 MB of external memory mapped space

  • TFT Controller with Direct Drive
  • Per-pixel alpha-blending engine

Hardware Cryptography

  • AES 128/256-bit keys
  • ECC B/K163, B/K233, P192, P224, P256
  • SHA-1 and SHA-2 (SHA-224 and SHA-256)
  • True Random Number Generator (TRNG)

Hardware CRC engine

  • Single-cycle computation with 8/16/32-bit data and 16-bit (programmable)/32-bit (fixed) polynomial

Security Management Unit (SMU)

  • Fine-grained access control for on-chip peripherals

Integrated Low-energy LCD Controller with up to 8×36 segments

  • Voltage boost, contrast and autonomous animation
  • Patented low-energy LCD driver

Backup Power Domain

  • RTCC and retention registers in a separate power domain, available in all energy modes
  • Operation from backup battery when main power absent/ insufficient

Ultra Low-Power Precision Analog Peripherals

  • 2× 12-bit 1 Msamples/s Analog to Digital Converter (ADC)
  • On-chip temperature sensor 
  • 2× 12-bit 500 ksamples/s Digital to Analog Converter (VDAC)
  • Digital to Analog Current Converter (IDAC)
  • Up to 4× Analog Comparator (ACMP)
  • Up to 4× Operational Amplifier (OPAMP)
  • Robust current-based capacitive sensing with up to 64 inputs and wake-on-touch (CSEN)
  • Up to 108 GPIO pins are analog-capable. Flexible analog peripheral-to-pin routing via Analog Port (APORT)
  • Supply Voltage Monitor


  • 7× 16-bit Timer/Counter
    • 3 + 4 Compare/Capture/PWM channels (4 + 4 on one timer instance)
    • Dead-Time Insertion on several timer instances
  • 4× 32-bit Timer/Counter
  • 32-bit Real Time Counter and Calendar (RTCC)
  • 24-bit Real Time Counter (RTC)
  • 32-bit Ultra Low Energy CRYOTIMER for periodic wakeup from any Energy Mode
  • 2× 16-bit Low Energy Timer for waveform generation
  • 3× 16-bit Pulse Counter with asynchronous operation
  • 2× Watchdog Timer with dedicated RC oscillator

Low Energy Sensor Interface (LESENSE)

  • Autonomous sensor monitoring in Deep Sleep Mode
  • Wide range of sensors supported, including LC sensors and capacitive buttons
  • Up to 16 inputs

Ultra efficient Power-on Reset and Brown-Out Detector

Debug Interface

  • 2-pin Serial Wire Debug interface
  • 1-pin Serial Wire Viewer
  • 4-pin JTAG interface
  • Embedded Trace Macrocell (ETM)

Pre-Programmed USB/UART Bootloader

Wide Operating Range

  • 1.8 V to 3.8 V single power supply
  • Integrated DC-DC, down to 1.8 V output with up to 200 mA load current for system
  • Standard (-40 °C to 85 °C TAMB) and Extended (-40 °C to 125 °C TJ) temperature grades available


  • 64-pin QFN (9 mm x 9 mm)
  • 64-pin QFP (10 mm x 10 mm)
  • 100-pin QFP (14 mm x 14 mm)
  • 112-pin BGA (10 mm x 10 mm)
  • 120-pin BGA (7 mm x 7 mm)
  • 152-pin BGA (8 mm x 8 mm)
  • 192-pin BGA (7 mm x 7 mm)


No compromises performance

  • 72 MHz Cortex-M4 with FPU
  • Large on-chip memories
  • High speed peripheral interfaces
  • Resources to support demanding UX

Low-energy operation

  • Extensive digital and analog functionality, even in deep sleep
  • Ultra-low sleep current, fast wakeup
  • Unique autonomous sleep-mode capabilities, using PRS and LESENSE

Professional software and tools

Getting Started with EFM32™ Giant Gecko GG11 Series 1

SLSTK3701A GG11 Starter Kit

The easiest way to begin development with the EFM32™ Giant Gecko GG11 Series 1 low-cost microcontroller family is with the SLSTK3701A Starter Kit.

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Giant Gecko GG11 Series 1 Product Matrix

Common Specifications

MCU Core: ARM Cortex-M4

MHz: 72

RAM: 512

ADC 1: 12-bit, 1 Msps

ADC 2: 12-bit, 1 Msps

DAC: 2x 12-bit, 500 ksps

Cap Sense: Yes

Temp Sensor: Yes

Timers (16-bit): 7

AES-128: Yes

AES-256: Yes

RTC: Yes

SPI: 6

I²C: 3

Part Number Data Sheet Dev Kit MHz Flash (kB) RAM (kB) Dig I/O Pins 5 Volt Tolerant ADC 1 ADC 2 DAC USB Cap Sense LCD Temp Sensor Timers (16-bit) ECC SHA-1 SHA-2 RSA-2048 UART USART SPI I²C I²S EMIF RTC Comparators Vdd (min) Vdd (max) Package Type Package Size Internal Osc. Debug Interface Cryptography Ethernet QSPI SDIO CAN
SLSTK3701A 72 2048 512 144 Yes 12-bit, 1 Msps 12-bit, 1 Msps 2x 12-bit, 500 ksps Yes Yes Yes Yes 7 Yes Yes Yes No 2 6 6 3 3 1 Yes 4 1.8 3.8 BGA192 7x7 ±2% JTAG; SW; ETM AES-128 AES-256 Yes Yes Yes 2
SLSTK3701A 72 2048 512 80 Yes 12-bit, 1 Msps 12-bit, 1 Msps 2x 12-bit, 500 ksps Yes Yes Yes Yes 7 Yes Yes Yes No 2 6 6 3 3 1 Yes 4 1.8 3.8 QFP100 14x14 ±2% JTAG; SW; ETM AES-128 AES-256 Yes Yes Yes 2

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