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SparkFun Thing Plus – QuickLogic EOS S3 Dev Kit

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Combines SparkFun’s Thing Plus form factor with QuickLogic’s EOS S3 MCU + eFPGA SoC

SparkFun “Thing Plus – QuickLogic EOS S3” development kit combines SparkFun’s Thing Plus form factor and the Qwiic® connect system with QuickLogic’s EOS S3 multicore MCU + eFPGA and QuickLogic’s QORC open source tools. This kit enables users to easily complement the embedded FPGA and MCU on the EOS S3 SoC with a multitude of additional development functionality. It’s fully supported by open source development tools, making the kit highly accessible to everyone.

Features and Specifications


  • Arm® Cortex®-M4F Microcontroller
    • up to 80 MHz operating frequency
    • up to 512 KB SRAM
  • Embedded FPGA (eFPGA)
    • 2400 effective logic cells
    • 64 Kb RAM
  • Feather Form Factor
    • Breadboard-compatible 0.1″ (2.54 mm) pitch headers - all headers are pre-soldered
    • 2.75″ × 0.9″ (70 mm × 22.9 mm) footprint
    • All 20 Feather-defined GPIO + 14 additional GPIO
  • Interfaces
    • SWD programming connector for use with USB-TTL converter
    • USB data signals are tied to eFPGA programmable logic
    • UART available via I/O headers
    • I²C available via I/O headers, and Qwiic Connector
    • I²S
    • SPI
  • Storage: 16 Mbit SPI NOR flash - GigaDevice GD25Q16CEIGR


  • Small and compatible with Adafruit’s Feather form factor and an extensive number of Qwiic products, including SparkFun's Qwiic Connect System that uses 4-pin JST connectors to quickly interface development boards with sensors, LCDs, relays, and more
  • With an Arm® Cortex®-M4F MCU and integrated eFPGA, the onboard EOS S3 lets you innovate with 100% open-source hardware and software
  • Fully open-source software development with support for FreeRTOS, Zephyr, nMigen, Docker and SymbiFlow


  • Tiny ML applications such as with SensiML’s AI Software Platform and Google’s TensorFlow Lite
  • General-purpose MCU applications

Qwiic Connect System

Thing Plus features SparkFun’s Qwiic connect system, which makes prototyping and development a snap:

  • Tons of expansion boards: There are hundreds of Qwiic-compatible expansion boards to choose from, including everything from RFID readers to displays to keypads
  • No soldering: Qwiic cables (4-pin JST) plug easily from development boards to sensors, shields, accessory boards and more, making it easy to set up a new prototype
  • Polarized connector: There’s no need to worry about accidentally swapping the SDA and SCL wires on your breadboard – the Qwiic connector is polarized so you know you’ll have it wired correctly every time, right from the start
  • Daisy chainable: It’s time to leverage the power of the I²C bus! Most Qwiic boards will have two or more connectors on them, allowing multiple devices to be connected
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