EFM32 Happy Gecko USB-enabled 32-bit Microcontroller

Ideal for battery operated applications and other systems requiring low energy and high performance, the Silicon Labs USB-enabled EFM32™ Happy Gecko family delivers the lowest USB power drain in the industry.  

Based on the powerful ARM® Cortex®-M0+ core, the family enables longer battery life and energy harvesting applications. The USB-Enabled Happy Gecko 32-bit microcontroller family features innovative low energy techniques, short wake-up time from energy saving modes, and a wide selection of peripherals. The MCUs offer up to 64 kB of flash memory with the added option of embedded USB connectivity and CPU speeds up to 25 MHz.

Features

  • 25 MHz ARM Cortex-M0+ CPU
  • Up to 64 kB flash
  • Up to 8 kB RAM
  • Up to 35 GPIOs
  • Low Energy USB
    • Full speed (12 MHz) USB 2.0 Device
  • Ultra low power precision and analog peripherals
    • 12-bit 1 Msps ADC
  • Autonomous sensor monitoring in deep sleep
  • Supports wide range of sensors, including LC sensors and capacitive buttons
  • Flexible energy management system with 5 different energy modes
    • 20 nA shutoff mode (0.5 µA with RTC)
    • 0.6 µA stop mode, including power-on-reset, brown-out detector, RAM and CPU retention
    • 0.9 µA deep sleep mode, including RTC with 32.768 kHz oscillator, power-on-reset, brown-out detector, RAM and CPU retention
    • 53 µA/MHz sleep mode
    • 131 µA/MHz run mode with code executed from flash
  • Cryptography: AES-128
  • Debug interface
  • 1.98–3.8 V supply voltage
  • Temperature range: –40 to +105 °C
  • Packages:
    • 48-pin QFP (7 mm x 7 mm)
    • 32-pin QFN (6 mm x 6 mm)
    • 24-pin QFN (5 mm x 5 mm)
    • 36-pin CSP (3 mm x 3 mm)

The Past, Present and Future of USB

The Silicon Labs low-power USB microcontroller family of products helps you balance your power budget while achieving all of your goals. 

Getting Started with EFM32™ Happy Gecko

Get the Happy Gecko Starter Kit

Kick off development today with the Happy Gecko SLSTK3400A starter kit, which includes a complete set of software enablement tools for EFM32 Happy Gecko 32-bit microcontrollers. Based on the ARM® Cortex®-M0+ processor, Happy Gecko MCUs are the industry’s most energy-friendly MCUs.

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Happy Gecko Product Matrix

Common Specifications

MCU Core: ARM Cortex-M0+

MHz: 25

Timers (16-bit): 3

Internal Osc: ±2%

Temp Sensor: Yes

Comparators: 1

Debug Interface: MTB; SW

Cap Sense: Yes

I²C: 1

I²S: 1

SPI: 2

USART: 2

Status
Devices
Part Number Data Sheet Dev Kit MHz Flash (kB) RAM (kB) Dig I/O Pins 5 Volt Tolerant ADC 1 DAC USB Cap Sense LCD Temp Sensor Timers (16-bit) AES-128 AES-256 ECC SHA-1 SHA-2 RSA-2048 UART USART SPI I²C I²S EMIF RTC Comparators Vdd (min) Vdd (max) Package Type Package Size (mm) Internal Osc. Debug Interface Cryptography
SLSTK3400A 25 32 4 17 No No Yes No Yes 3 No No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW
SLSTK3400A 25 32 4 17 No No Yes No Yes 3 No No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW
SLSTK3400A 25 64 8 17 No No Yes No Yes 3 No No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW
SLSTK3400A 25 64 8 17 No No Yes No Yes 3 No No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW
SLSTK3400A 25 32 4 17 No 12-bit, 2-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 32 4 17 No 12-bit, 2-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 17 No 12-bit, 2-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 17 No 12-bit, 2-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 32 4 24 No 12-bit, 4-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN32 6x6 ±2% MTB; SW AES-128
SLSTK3400A 25 32 4 24 No 12-bit, 4-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN32 6x6 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 24 No 12-bit, 4-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN32 6x6 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 24 No 12-bit, 4-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN32 6x6 ±2% MTB; SW AES-128
SLSTK3400A 25 32 4 37 No 12-bit, 4-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 32 4 37 No 12-bit, 4-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 37 No 12-bit, 4-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 37 No 12-bit, 4-ch., 1 Msps No Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 15 No Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 15 No Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 15 No Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 15 No Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 15 No 12-bit, 2-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 15 No 12-bit, 2-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 15 No 12-bit, 2-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 15 No 12-bit, 2-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN24 5x5 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 22 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN32 6x6 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 22 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN32 6x6 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 22 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN32 6x6 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 22 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFN32 6x6 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 35 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 35 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 35 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 35 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 35 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 35 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 35 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 35 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 QFP48 7x7 ±2% MTB; SW AES-128
SLSTK3400A 25 32 8 22 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 CSP36 3x3 ±2% MTB; SW AES-128
SLSTK3400A 25 64 8 22 No 12-bit, 4-ch., 1 Msps Yes Yes No Yes 3 Yes No No No No No 3 2 2 1 1 0 Yes 1 1.98 3.8 CSP36 3x3 ±2% MTB; SW AES-128
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