FLY-D8-Pro Mainboard Introduction

The Mellow Fly-D8-Pro is a high-performance 3D printer control mainboard developed by the Fly3D mainboard R&D team of Guangzhou Mellow Electronic Technology Co., Ltd. It supports up to 8 stepper motor drivers.

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Product Features

• The 5V power supply for interfaces like limit switches is isolated and protected. It will not output power if the main POWER supply is not connected.
• Utilizes the 32-bit ARM Cortex-M7 series STM32H723 master control chip with a main frequency of 550MHz.
• Supports CAN bus and RS232 connections for more stable data transmission, lower latency, and more reliable connections.
• The mainboard features BOOT and RESET buttons, allowing users to enter DFU mode via USB for firmware updates.
• The power interface has reverse connection protection to prevent board damage from incorrect power cable connection during DIY assembly.
• Provides two USB 2.0 interfaces, expanding connection possibilities. One USB port can be switched to an RS232 interface via a physical switch to accommodate various device connection needs.

Key Features

• Core Performance: Uses the STM32H723 chip with a 32-bit ARM Cortex-M7 core running at 550MHz, offering strong computational capabilities.
• Rich Interfaces: Supports 8 motor drivers, 6 limit switches, 4 heaters & thermistors, and 2 RGB light strips, providing high expandability.
• Reliable Connectivity: Supports CAN bus and RS232 communication for stable data transmission with low latency.
• Safety Protection:
  • Power input features reverse connection protection.
  • The 5V supply for interfaces like limit switches uses an isolated design and does not output when the main power is disconnected, preventing damage from misoperation.
• Convenient Debugging: Onboard BOOT and RESET buttons allow easy entry into DFU mode via USB for firmware flashing.
• Dual USB Design: Provides two USB 2.0 interfaces. One can be physically switched to an RS232 interface, adapting to various external devices.

Technical Specifications

Item	Description
Master Chip	STM32H723 (ARM Cortex-M7 @ 550MHz)
Supported Firmware	Marlin 2.0 / Klipper
Driver Support	8 channels, compatible with A4988, LV8729, DRV8225, TMC2208/2209/5160 (UART/SPI), etc.
Display Interface	Serial touch screen, mini12864 LCD, 12864 LCD, 2004 LCD, FLY 4.3/7.0 V1
Probe Support	BLTouch, PL08N, Klicky, Voron Tap, and other auto-leveling sensors
Input Voltage	DC 12V or 24V
Temperature Sensing	4 independent thermistor interfaces
Heater Output	4 channels (1 for heated bed + 3 for extruder heaters)
Other Interfaces	6 limit switch interfaces, 2 RGB interfaces, CAN bus interface, USB/RS232 switchable interface

Interfaces & Connections

• Power Supply: Uses a reverse-protected terminal, supporting 12V/24V input.
• Motor Drivers: 8 independent driver slots, supporting various stepper driver modules.
• Communication: Supports USB, CAN, and RS232, allowing flexible configuration as needed.

Important Notes

Output Port	Max Current @ 24V Power	Max Current @ 12V Power
Heated Bed Port	10A	5A
Heater Cartridge Port	6A	3A
Fan Port	1A	0.5A

• Please ensure the power supply voltage and current meet the above requirements to avoid overload.
• Before connecting the power supply, double-check the polarity to prevent reverse connection.