Version 1.6

Changes

• Add PD resistor on SPI SCK as a permanent workaround for ill behaving SPI handling of Marlin
• Silkscreen: Orientation marker on some additional connectors
• Fixed some BOM issues

Known issues:

• None

Version 1.5

Changes

• Copper pour fixed: VCC connection on USB isolation chip
• Silkscreen: Orientation marker on connectors

Known issues:

• None

Version 1.4

Changes

• Changed default solder mask clearance from 0.2 to 0.05
• SD card detect of onboard SD card reader is now connected to GND
• Changed 3.3V LDO to a LDO with better short circuit protection

Known issues:

• None

Version 1.3

Changes

(Since 1.1)

• Onboard micro SD card reader
• One sided component placement
• Better ground design
• Better noise isolation for switching power supply and crystal
• SMD based debug header for easier production
• Series resistor for the external SD Card reader on EXT-2

Breaking changes:

• The addition of the SD card reader need some changes in the firmware. The default reader will be the onboard reader.
• Removal of the "KILL PIN" and re-routing as RESET signal.

Moving forward the design is considered "finalized" and we won't produce any breaking changes for the V1 version.

Bugs fixed

• BTN_ENC1 and BTN_ENC2 were in wrong order

Known issues:

• None

Version 1.1

Changes:

• Changed fan tachometer RC filter and PU resistor to 4.7k for better filtering of high frequency noise
• Added Schmitt Trigger to aid STM32F7 reading the tachometer input signal
• Raised PU signal from 3.3V to 5V for increasing signal margin
• Minor silkscreen changes

Bugs fixed:

• Faulty reading of fan tachometer input

Known issues:

• None known

Version 1.0

Changes:

• New placement and routing of the PCB by using two sided placement of some components
• Better, less noisy design of the DC-DC switching converter (5V)
• Support for both TPS54308 and TPS54302 switching converter
• Changed mounting holes to 3.5mm
• Mounting holes not grounded anymore
• TMC2130 power traces are much wider with better routing
• Protection diodes for the TMC2130 (output and power-on protection)
• Added PU resistor for the TMC2130 enable pin (power-on protection)
• 24 Mhz crystal closer to MCU and length matched traces
• Some bypass capacitors are better placed
• EXT-3 header description added
• EXT-1 and EXT-2 now designed for unshielded design
• Reverse voltage protection for the SRAM backup battery (P-MOSFET)
• Added diodes for endstop and fan tachometer protection

Bugs fixed:

• Reversed SWD pins fixed

Known issues:

• None known

Version 0.8

First developer board created.