Eduard Iten
34aecf7871
- Add datasheets for all components with an LCSC part number to doc/datasheets/ - Create README.md in datasheets directory explaining the download process - Update CHANGELOGs and READMEs with information about the new datasheets
3.5 KiB
3.5 KiB
Changelog
All notable changes to this project will be documented in this file.
The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.
[Unreleased]
Added
- Documentation: Added datasheets for all components with an LCSC part number in
doc/datasheets.
Fixed
- USB Hub Controller (U401/CH334): Pin 4 (XO) connected to GND to enable operation without crystal
- DC/DC Converter (U202/XR76208): Enable circuit changed from voltage divider to Zener diode to enable 12V operation
- USB Outputs: Fuses replaced with TPS2557 power distribution switches to prevent backfeeding
Changed
- Production: Test points TP202/TP203 excluded from BOM
- JLCPCB Optimization: Rotation offsets adjusted for automated assembly
- U202/U301: FT Rotation Offset 270°
- U401: FT Rotation Offset 180°
Technical Details
- USB Hub Stability: CH334 now operates in internal oscillator mode without external crystal
- Extended Input Voltage: XR76208 now supports 12-24V input voltage through Zener diode-based enable circuit
- USB Backfeed Protection: TPS2557 prevents backfeeding from external USB devices and provides overcurrent/short-circuit protection
- Manufacturing Efficiency: Optimized component orientation reduces production time
[Rev. 0.3] - 2025-12-09
Added
- CAN Transceiver: 10µF capacitor C304 for improved CAN communication stability
- PCB Layout: QR code placeholder for serial number on the PCB
Technical Details
- Enhanced Signal Integrity: Additional filtering at CAN transceiver for more stable data transmission
- Traceability: QR code enables unique identification and documentation
[Rev. 0.2] - 2025-12-08
Improvements
- Schematic: Cleaned up and structured (Thanks to "shx")
- CAN Transceiver: Silent pin connected to GND for better stability (Thanks to "shx")
Added
- Status LEDs:
- Yellow LEDs for 24V, 5V and 3.3V voltage indication
- Green LED on microcontroller (Pin PB4)
- Solder Jumpers: Replaced standard jumpers with solder jumpers on bottom side
- PFET Control: Added jumpers for output PFETs - enables permanent-on without firmware
- Test Points: Added robust test points for 5V and GND for load testing
- Heatsink: Optional heatsink for DC/DC converter on bottom side
- MCU Capacitor: 10µF capacitor for microcontroller on 3.3V rail
Changed
- Production: Added all LCSC part numbers, defined rotations, created production data
- PCB Layout:
- Adjusted according to schematic changes
- Improved button positioning
- BOM Optimized:
- Replaced 30kΩ with basic part 33kΩ
- Changed 15.5kΩ DC/DC feedback to 15kΩ → new output voltage: 5.1V
- CAN ESD Protection: Replaced NUP2105L with PESD1CAN (better suited)
- CAN Termination Resistor: Changed footprint from 0402 to 0603 for adequate power rating
- USB Hub: Changed supply from 5V to 3.3V (per datasheet recommendation)
Technical Details
- DC/DC Output: New voltage 5.1V instead of 5.25V due to feedback resistor change
- Improved Heat Dissipation: Optional heatsink on bottom side
- Stable CAN Communication: Through ESD protection upgrade and resistor optimization
Note: The original documentation is in German (CHANGELOG.de.md). This English version is a translation for international users.