Major hardware update: toolhead switching, DC/DC protection, and documentation overhaul
Hardware Changes: - Replaced reverse polarity protection with 2x PFET toolhead switching (PB2/PA5 control) - Added SS56 Schottky diode reverse polarity protection for DC/DC converter - Updated current limit resistor to 5.1kΩ (~10.2A) - Removed fan control circuitry and JST-XH connector - Removed internal JST-XH USB port with fuse/protection Documentation Updates: - Updated both README files to reflect hardware changes - Removed all fan control references and configurations - Updated Klipper configuration examples - Cleaned up pinout and connector assignments - Updated technical specifications table - Fixed table of contents and cross-references
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README.md
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README.md
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> 🌍 **Languages:** [English](README.md) | [Deutsch](README.de.md)
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A universal interface board (HAT) for Raspberry Pi 4/5 and Radxa Rock 5B designed for use in Voron 3D printers. Provides powerful 5V supply (8A), CAN-Bus interface (USB-Bridge or Native), USB hub, and fan control.
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A universal interface board (HAT) for Raspberry Pi 4/5 and Radxa Rock 5B designed for use in Voron 3D printers. Provides powerful 5V supply (8A), CAN-Bus interface (USB-Bridge or Native), and USB hub.
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- [🔋 Power Supply (24V Input)](#-power-supply-24v-input)
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- [⚡ DC/DC Converter (5V Output)](#-dcdc-converter-5v-output)
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- [🔌 Logic Power Supply (Power Path)](#-logic-power-supply-power-path)
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- [🧠 MCU & CAN Interface](#-mcu--can-interface)
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- [💻 MCU & CAN Interface](#-mcu--can-interface)
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- [📡 USB Hub](#-usb-hub)
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- [🌊 Fan Control](#-fan-control)
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- [📋 Klipper Configuration](#-klipper-configuration)
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- [Basic MCU Setup](#basic-mcu-setup)
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- [Fan Control](#fan-control)
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- [🔌 Pinout & Connector Assignment](#-pinout--connector-assignment)
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- [Power Input](#power-input)
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- [CAN-Bus Ports](#can-bus-ports)
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- [USB Ports](#usb-ports)
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- [Fan Control](#fan-control-1)
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- [🛠️ PCB Specifications](#️-pcb-specifications)
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- [⚠️ Manufacturing Recommendations](#️-manufacturing-recommendations)
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- [PCB Manufacturing](#pcb-manufacturing)
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- **Input Voltage:** 24V DC nominal
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- **Connectors:** XT30PW-F (horizontal) or 5.08mm screw terminal
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- **Reverse Polarity Protection:** P-Channel MOSFET (CJAC70P06, -60V, -70A, RDSon ~8mOhm)
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- **MOSFET Gate Protection:** 15V Zener diode (BZT52C15S) between Source and Gate
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- **Voltage Divider:** 30kΩ (Gate-Source) and 30kΩ (Gate-GND)
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- **Overvoltage Protection:** TVS diode (SMAJ26A, 26V Standoff, Unidirectional) placed AFTER MOSFET to GND
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- **Toolhead Switching:** 2x P-Channel MOSFETs (CJAC70P06, -60V, -70A, RDSon ~8mΩ) controlled by PB2 and PA5 for toolhead power switching (safety feature if PWM-FET on toolhead fails)
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- **Overvoltage Protection:** TVS diode (SMAJ26A, 26V Standoff, Unidirectional) to GND
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- **Input Protection:** Distributed fusing (5A for DC/DC, 5A each for CAN ports)
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### ⚡ DC/DC Converter (5V Output)
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- **Controller:** MaxLinear XR76208 (Synchronous Step-Down, 8A, COT)
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- **Input Fuse:** 5A SMD 1812 Slow Blow
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- **Output Voltage:** 5.25V (set via feedback divider: R_Top=15.5kOhm, R_Bottom=2.0kOhm)
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- **Reverse Polarity Protection:** SS56 Schottky diode
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- **Output Voltage:** 5.25V (set via feedback divider: R_Top=15.5kΩ, R_Bottom=2.0kΩ)
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- **Switching Frequency:** ~600kHz (set via Ron=30kOhm)
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- **Inductance:** 3.3µH Shielded (Sunlord MDA1050-3R3M, Isat ~17A)
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- **Input Capacitors:** 4x 10µF 1206 ceramic + 1x 100µF electrolytic/polymer (bulk)
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- STM32 (internal)
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- USB-C connector (for touchscreen)
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- USB-A connector (vertical, for webcam)
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- JST-XH header (internal, pinout: 5V, D-, D+, GND)
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**USB Port Protection:**
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- **Concept:** 100µF electrolytic tank at +5V_PWR, followed by polyfuse, followed by 22µF ceramic at connector
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- ESD Protection: SRV05-4 TVS array
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- **USB-A Port (Webcam):**
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- Polyfuse: 1.5A hold current
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- ESD Protection: SRV05-4 TVS array
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### 🌊 Fan Control
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- **Connector:** JST-XH 2-pin
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- **Driver:** N-Channel MOSFET (AO3400)
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- **STM32 Pin:** PA8 (Timer 1, hardware PWM capable)
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- **Fail-Safe:** 10kΩ pull-up resistor from gate to 3.3V (fan runs 100% during reset/flash)
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- **Gate Series Resistance:** 1kΩ
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- **ESD Protection:** SRV05-4 TVS array
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## 📋 Klipper Configuration
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sensor_mcu: hat
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```
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### Fan Control
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```ini
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[temperature_fan mcu_fan]
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pin: hat:!PA8
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# Note: Inverted due to fail-safe pull-up logic
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sensor_type: temperature_mcu
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sensor_mcu: hat
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max_power: 1.0
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shutdown_speed: 1.0
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cycle_time: 0.01
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hardware_pwm: True
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target_temp: 50.0
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min_temp: 10
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max_temp: 80
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control: pid
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pid_kp: 1.0
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pid_ki: 0.5
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pid_kd: 2.0
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```
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## 🔌 Pinout & Connector Assignment
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### Power Input
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| **Logic Supply Current** | 2 | A |
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| **CAN Baud Rate** | up to 1 | Mbit/s |
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| **USB Speed** | 480 | Mbit/s |
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| **Fan Control** | PWM, 5V switching | - |
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| **Operating Temperature** | -10 to +70 | °C |
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| **Dimensions** | 65 x 56 | mm |
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