Keywords: USB, LPT, parallel, parallel port, printer port, converter, adaptor
To USB2LPT — Overview

USB2LPT – Cloning instructions for Release 1.3

Electronic Components

• CY7C68013A-56LFXC (»FX2LP«) discontinued (2011), replacement is CY7C68013A-56LTXC
• Quartz crystal 24000 kHz [fundamental]
• LD1117S33 (Voltage regulator)
• USB receptacle (USB BG 0,29 €)
• USB cord (AK 672/2-1,0 0,55 €) 1 m, or longer who need
• SubD female connector 25 pin (D-SUB BU 25 0,10 €)
• two LEDs, some resistor arrays (0,80 €)
• some capacitors (SMD 0603, about 1,50 €)
• Double-sided PCB (industrial vias)
• Housing (KAPPE CG25G 0,13 €)

Software

• Circuit Diagram and PCB Silkscreen, Source for PCB software Eagle

  Despite some changes in pin assignment between Rev.2 and Rev.3, the same firmware runs on Rev.2 upto Rev.4. The firmware branches and patches itself for the various differences. This eliminates the need to me as programmer to update too many firmware versions.

  The Windows driver and firmware you can find at the page above, and some hints how to use.

Preparation

• Drill two holes for LEDs into one half-housing
• Label the housing
• Bend pins of D-sub receptacle a bit wider
• USB receptacle: bend pins straight, and cut them (see picture)
• Crystal, LEDs: cut pins

Building

• Apply SMD solder, populate SMDs, reflow process
• Check for short-circuit between 5V, 3.3V, and ground, correct errors
• Label white serial number field
• Press SubD socket, solder
• Align and solder USB receptacle (see picture)
• Isolate crystal with adhesive tape
• Peek holes for crystal through adhesive tape, populate crystal
• Funktion check (see Device Manager), correct errors
• Program (EzMr.EXE or Brenner.exe) the EEPROM dump file USB2LPT2.IIC
• Function check with LPT Tester, run Kurzschlusstest.exe, correct errors
• Housing: Label serial number
• Align and populate LEDs
• Close device, final check (at a high-speed-capable USB port)

Known errors and problems

No errors known, but:

• Some PCBs have silkscreen text upside-down (Eagle problem using panelize.ulp)
• Solder jumper SJ2 (EEPROM deactivation) does not work on new „A“ devices (CY7C68013A-56LFXC)! Corrected in Rev.4.

Solder Jumper