It is important to clarify that for a specific piece of hardware like the Creality V2.2 board, "papers" usually refer to technical schematics, pinout diagrams, or community-generated documentation rather than academic research papers.
(V422 refers to V4.2.2 board)
Standard ports for the X-axis, Y-axis, Z-axis, and Extruder motors. Sensor Inputs (2/3-Pin JST): Ports for X-Min, Y-Min, and Z-Min physical switches. Thermistors: Ports for monitoring the temperature of the nozzle and bed. BLTouch/CR Touch: Creality V2 2 Board Diagram
Custom Dual-Z/Extruder Mods: Used by hobbyists to add a second Z-motor or a second extruder to an Ender 3 Pro Go to product viewer dialog for this item. It is important to clarify that for a