Eduard Iten
5615fff072
- Fixed USB hub controller (U401/CH334): XO pin connected to GND for crystal-less operation - Fixed DC/DC converter (U202/XR76208): Enable circuit changed to Zener diode for 12V operation - Fixed USB outputs: Replaced fuses with TPS2557 power distribution switches for backfeed protection
74 lines
3.4 KiB
Markdown
74 lines
3.4 KiB
Markdown
# Changelog
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> 🌍 **Languages:** [English](CHANGELOG.md) | [Deutsch](CHANGELOG.de.md)
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All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/).
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## [Unreleased]
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### Fixed
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- **USB Hub Controller (U401/CH334):** Pin 4 (XO) connected to GND to enable operation without crystal
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- **DC/DC Converter (U202/XR76208):** Enable circuit changed from voltage divider to Zener diode to enable 12V operation
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- **USB Outputs:** Fuses replaced with TPS2557 power distribution switches to prevent backfeeding
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### Changed
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- **Production:** Test points TP202/TP203 excluded from BOM
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- **JLCPCB Optimization:** Rotation offsets adjusted for automated assembly
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- U202/U301: FT Rotation Offset 270°
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- U401: FT Rotation Offset 180°
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### Technical Details
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- **USB Hub Stability:** CH334 now operates in internal oscillator mode without external crystal
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- **Extended Input Voltage:** XR76208 now supports 12-24V input voltage through Zener diode-based enable circuit
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- **USB Backfeed Protection:** TPS2557 prevents backfeeding from external USB devices and provides overcurrent/short-circuit protection
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- **Manufacturing Efficiency:** Optimized component orientation reduces production time
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## [Rev. 0.3] - 2025-12-09
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### Added
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- **CAN Transceiver:** 10µF capacitor C304 for improved CAN communication stability
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- **PCB Layout:** QR code placeholder for serial number on the PCB
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### Technical Details
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- **Enhanced Signal Integrity:** Additional filtering at CAN transceiver for more stable data transmission
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- **Traceability:** QR code enables unique identification and documentation
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## [Rev. 0.2] - 2025-12-08
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### Improvements
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- **Schematic:** Cleaned up and structured (Thanks to "shx")
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- **CAN Transceiver:** Silent pin connected to GND for better stability (Thanks to "shx")
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### Added
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- **Status LEDs:**
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- Yellow LEDs for 24V, 5V and 3.3V voltage indication
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- Green LED on microcontroller (Pin PB4)
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- **Solder Jumpers:** Replaced standard jumpers with solder jumpers on bottom side
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- **PFET Control:** Added jumpers for output PFETs - enables permanent-on without firmware
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- **Test Points:** Added robust test points for 5V and GND for load testing
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- **Heatsink:** Optional heatsink for DC/DC converter on bottom side
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- **MCU Capacitor:** 10µF capacitor for microcontroller on 3.3V rail
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### Changed
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- **Production:** Added all LCSC part numbers, defined rotations, created production data
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- **PCB Layout:**
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- Adjusted according to schematic changes
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- Improved button positioning
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- **BOM Optimized:**
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- Replaced 30kΩ with basic part 33kΩ
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- Changed 15.5kΩ DC/DC feedback to 15kΩ → new output voltage: 5.1V
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- **CAN ESD Protection:** Replaced NUP2105L with PESD1CAN (better suited)
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- **CAN Termination Resistor:** Changed footprint from 0402 to 0603 for adequate power rating
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- **USB Hub:** Changed supply from 5V to 3.3V (per datasheet recommendation)
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### Technical Details
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- **DC/DC Output:** New voltage 5.1V instead of 5.25V due to feedback resistor change
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- **Improved Heat Dissipation:** Optional heatsink on bottom side
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- **Stable CAN Communication:** Through ESD protection upgrade and resistor optimization
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---
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> **Note:** The original documentation is in German ([CHANGELOG.de.md](CHANGELOG.de.md)). This English version is a translation for international users. |