V1.1B

Changes

• Add 100K pull-down resistor to PB2 (BOOT1) to ensure bootloader can always be entered

V1.1A

Changes

• Stepper Driver Improvements
  • Fix stepper driver SPI pinout (#17, #23)
  • Add support for TMC2208/2209 UART interface
  • Add support for TMC StallGuard DIAG signal
  • Replace VMOT protection diode with P-FET to reduce voltage drop
• Endstop Improvements
  • Add RC filter (10K/2.2nF) to each endstop to filter/debounce + provide ESD and overvoltage protection
  • Add pull-up resistor to each endstop
  • Add solder jumper for selecting endstop voltage (5V or 3.3V - defaults to 3.3V)
• Thermistor Improvements
  • Add series resistor to thermistor signal, forming RC filter with existing capacitor to filter + provide ESD protection
• Add servo header
  • Pin PA15 dedicated to servo use + also supports hardware PWM
• Overhaul 5V Power Supply:
  • Replace AOZ1292 with AP63205
  • Maximum current available increased from 1.2A to 2A
  • Synchronous regulator improves efficiency
• Rework auxiliary power header
  • Add header for 5V output directly from 5V regulator
  • Make header strip for auxiliary power continuous (VIN, 12V, 5VDC, 5V, 3.3V)
• Add I2C EEPROM
  • 24LC64T-I/OT (8kB) added to board
• Make space for above changes
  • Change most passives to 0402 size
  • Remove unused user button
  • Remove 2 x I2C headers (2 remain)

V1.0E

Changes

• Change bed MOSFET
  • Change package to the same package as other MOSFETs (SO8 / LFPAK)
  • Change part to PSMN1R8 (same part as RUMBA+ bed MOSFET)
  • Package has improved power dissipation + more alternative parts available

V1.0D

Changes

• Add button for BOOT0
• Replace U2 (bed MOSFET current-driver IC) with 74LVC1G17SE logic buffer to raise drive voltage