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iCEBreaker Bitsy

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iCEBreaker Bitsy is the smaller but just-as-capable sibling to iCEBreaker. At just 36x18mm, it is compatible with the Teensy form-factor and can be easily embedded into any project.

iCEBreaker Bitsy v1.0a product photo iCEBreaker Bitsy v1.1a photo iCEBreaker Bitsy v1.1b panel photo


  • iCE40UP5K in QFN48 (SG48) package
    • PLL, two SPI and two I2C hard IPs
  • 128M (16MiB) DDR- and QPI-capable Flash Memory
  • 64M (8MiB) QPI-capable Pseudo-SRAM
  • USB-C interface (comes preloaded with a RISC-V soft-core USB bootloader)
  • RGB LED connected to 3x 24mA hard PWM IP pins
  • Two user LEDs (one shared with RAM-CS)
  • Status LED for CDONE
  • 12MHz external clock (on PLL GBIN)
  • One user button
  • Supply rails: 3.3V and 1.2V
  • FPGA SPI/programming header
    • 4 pins for config (SDI, SDO, SCK, CS)
    • 2 extra GPIO pins for QSPI/QPI
    • CDONE, CRESET, 3.3V, and GND
  • Teensy form-factor compatible
  • Compatible with Feather ecosystem using a Teensy 3.x Feather Adapter
  • Castellated edges and single-side-load for easy module integration

iCEBreaker Bitsy v1.1c info card, front iCEBreaker Bitsy v1.1c info card, back


v1.1c (2021-06-28)

  • Added solder pads for USB-C SBU and CC pins
  • Improved back side silkscreen

v1.1b (2020-10-19)

  • Changed board dimensions to metric instead of imperial (36x18mm)
  • Added top-side silkscreen labels
  • Enlarged USB-C solder paste openings

v1.1a (2020-08-05)

  • Switched to WSON 6x5mm flash to accommodate through-hole programming header
  • Improved silkscreen

v1.0a (2020-06-10)

  • Complete redesign
  • Pinout/dimensions now Teensy-compatible
  • Moved Pseudo-SRAM to the top, populate it by default