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Adafruit KB2040 - RP2040 Kee Boar Driver
Adafruit KB2040 - RP2040 Kee Boar DriverAdafruit KB2040 - RP2040 Kee Boar DriverAdafruit KB2040 - RP2040 Kee Boar DriverAdafruit KB2040 - RP2040 Kee Boar Driver

Adafruit KB2040 — RP2040 Kee Boar Driver

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A wild Kee Boar appears! It’s a shiny KB2040! An Arduino Pro Micro-shaped board for Keebs with RP2040. #keeblife

A lot of folks like using Adafruit parts for their Keeb builds – but with the ItsyBitsy not being pin-compatible with the pro micro pinout, it really wasn’t very easy without some sort of adapter plate.

Now we’re seeing lots of people use CircuitPython for keebs, which is awesome! So why not try our hands at spinning up a pro-micro-compatible RP2040 board? The RP2040 is plenty powerful, low-cost, and makes for an excellent keeb driver chip.

We mixed together what we liked most about the SparkFun Pro Micro RP2040 (Qwiic / STEMMA QT I2C port on the end, so good!) and Elite-C (castellated pads & pins for D+ and D-) and our existing RP2040 boards (boot button can be used for user, 8MB QSPI flash, onboard NeoPixel, jumper for skipping the diode/fuse for high power RGB LEDs or USB hosting). We even got it to all fit on a 2-layer PCB with 7/7 routing – just needed to make the smallest caps and resistors 0402.

Peep our preview blog post for the prototype gerber images.

Technical Details

RP2040 Datasheet:  https://datasheets.raspberrypi.org/rp2040/rp2040_datasheet.pdf

RP2040 Chip features:

  • Dual ARM Cortex-M0+ @ 133MHz
  • 264kB on-chip SRAM in six independent banks
  • Support for up to 16MB of off-chip Flash memory via dedicated QSPI bus
  • DMA controller
  • Fully-connected AHB crossbar
  • Interpolator and integer divider peripherals
  • On-chip programmable LDO to generate core voltage
  • 2 on-chip PLLs to generate USB and core clocks
  • 30 GPIO pins, 4 of which can be used as analog inputs
  • Peripherals
    • 2 UARTs
    • 2 SPI controllers
    • 2 I2C controllers
    • 16 PWM channels
    • USB 1.1 controller and PHY, with host and device support
    • 8 PIO state machines

Product Dimensions: 35.0mm x 17.8mm x 4.9mm / 1.4″ x 0.7″ x 0.2″

Product Weight: 2.8g / 0.1oz

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