ATX2AT Smart Converter

TL;DR – The ATX2AT Smart Converter is the ultimate tool to securely replace vintage power supplies with a standard PC ATX power supply. It’s open-source, open-hardware and firmware upgradable via USB.

Please check the project page for more information: x86.fr/ATX2AT

Content

This GIT repo is intended for hardware or software developers.

• BOM/ - Contains the Bill Of Material for the ATX2AT Smart Converter
• Firmware/ - Contains the Firmware source & binary files
• Gerbers/ - Contains the PCB Gerber (2-layers / 1.6mm / 2oz)
• Schematics/ - Contains the Circuit Schematic
• Tool/ - The companion the C# tool for live-monitoring (actually early Beta)

The companion tool only works on Windows 10 64-bit.

The Firmware is compatible with the Arduino IDE 1.8.12+ configured for Arduino Micro. It only requires the Adafruit_GFX and Adafruit_SSD1306 libraries to drive the OLED Display.

EEPROM Value

Here are some tips about how the Internal EEPROM space is used on the ATX2AT Smart Converter.

-------------
EEPROM Values
-------------
0x00 : Magic Byte (0xAD)
0x01 : FW Revision (Major)
0x02 : FW Revision (Minor)
0x03 : Screensaver Duration (minutes)
0x04 : SlowBlow Delay (ms * 10)
0x05-0x0B : RESERVED
0x0C : Cal Factor (5V VOLTAGE)
0x0D : Cal Factor (5V CURRENT)
0x0E : Cal Factor (12V VOLTAGE)
0x0F : Cal Factor (12V CURRENT)
0x10 : Slot 0x00 (5V Setting)
0x11 : Slot 0x01 (5V Setting)
...
0x2F : Slot 0x31 (5V Setting)
0x30 : Slot 0x01 (12V Setting)
...
0x4F : Slot 0x31 (12V Setting)

USB Protocol

And some quick tips about how data are exchanged between the Conf Tool and the ATX2AT Smart Converter

----------------------
Communication protocol
----------------------
Byte[0]  : 0x56 (Magic Header)
Byte[1]  : 0x?? ('N' : Number of bytes in the whole trame, including checksum)
Byte[2]  : 0x?? (Command Byte)
Byte[3+] : 0x?? (Command Data - optional)
Byte[N]  : 0x?? (Last Byte - XOR Checksum)

Command Byte (Byte[2])
----------------------
0xA0 : Get Status
0xA1 : Get EEPROM from 0x00 to 0x3F
0xA2 : Toggle Power
0xB0 : Reset EEPROM to default Value
0xB1 : Set EEPROM Byte (followed by Byte Address then Byte Data)
0xB2 ; Set EEPROM 2-Bytes (to update current limit table)

Reply to commands
-----------------
0xA0 : 0x56 0x0E 0xA0 PIN_STATUS[2] 5V_CURRENT[2] 12V_CURRENT[2] 5V_VOLT[2] 12V_VOLT[2] 0x(CHECKSUM)
0xA1 : 0x56 0x06 0xA1 0x(BYTE ADR) 0x(BYTE VALUE) 0x(CHECKSUM)
0xA2 : Same reply than 0xA0
0xB0 : 0x56 0x05 0xB0 0x(CHECKSUM)
0xB1 : 0x56 0x05 0xB1 0x(CHECKSUM)
0xB2 : Same as 0xB1

Author

Sam "Doc TB" DEMEULEMEESTER - @d0cTB Email : 01100100011001010111011001000000011110000011100000110110001011100110011001110010