Helios

Helios
Manufacturer	0xCB
License	CERN OHL V2 S
Host port	USB Type C
Microcontroller	RP2040
MPU	2 × ARM Cortex M0+
Voltage	3.3V
Clock speed	133 MHz
Digital I/O pins	26
I/O Voltage	3.3V
RAM	264 KB
Program memory	16 MB (External Flash over QSPI)
EEPROM	Emulated in flash
Boot loader	UF2 (in ROM)
Website	keeb.supply/products/0xcb-helios
Schema	github.com/0xCB-dev/0xCB-Helios

The 0xCB Helios is an Elite-C compatible MicroController, based on the high-performance and affordable RP2040.

It’s a drop-in replacement for legacy ProMicro boards.

Powerful RP2040 32-bit Cortex M0+ dual core running at 133 MHz and 264kB SRAM.
16MB/128Mb QSPI FLASH chip for storing files and code
Only 3.16 mm thick thanks to a mid-mounted USB-C port
3.3V 500mA LDO, PTC fuse and ESD protection chip
Elite-C, Pro Micro, SparkFun Pro Micro RP2040, and nice!Nano compatible pinout (follows the BastardKb standard)
8 extra I/O pins: (GP12-GP16) added along the bottom edge, (GP10-GP11) at the top and a 5V level shifted pin to drive RGB LEDs for example (GP25)
25 available digital pins for a maximum of 13x12 = 156 switches (using a standard matrix)
Default off red power LED (selectable via a jumper on the left side)
blue user LED on pin GP17
4 pins configurable as analog inputs
USB D+/D- broken out for use with an external USB socket/daughterboard
USB VBUS detection on GPIO19 for split keyboard side detection
UF2 bootloader for drag & drop programming via your file manager
easy to use and backward compatible Single button boot and reset circuit push to reset and hold >500ms to enter bootloader (legacy boards with reset buttons will continue to work!)
RAW / VBUS output, for powering RGB LEDs or other 5 V devices. The jumper on top lets you skip over the 500 mA fuse and Schottky diode, for up to 3A from USB ports.
USB-C connector lets you access built-in ROM USB bootloader and serial port debugging

Pinout

Firmware framework: