Converter From USB To Parallel

Electronic Components⚓

You need:

CY7C68013A-56PVXC (»FX2LP«)
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 €)
Transistor, Zener diode (0,13 €) as voltage regulator
Capacitors and Resistors (SMD 0805, about 1,50 €)
Double-sided PCB (industrial vias)
Housing (KAPPE CG25G 0,13 €)

Software⚓

Circuit Diagram and PCB Silkscreen, Source for PCB software Eagle
Firmware for serial EEPROM
It simply puts USB OUT transfers to the OUT port, and answers to IN transfers. ECP are EPP are simulated too.
The driver for Windows you can get from page above, and usage hints too.

Known PCB bugs and annoyances⚓

This wiring is unable to read level on control lines (i.e. cannot detect short circuit or intended ground connection of pulled-high open-colloector output [as defined in SPP mode]), cumbersome firmware programming
Cumbersome deactivation of EEPROM (in case of accident)
Bad placed components for housing, LED justification difficult
Pads for USB chip too small for hand-soldering
Cut-out for USB receptacle cannot be milled

External downloads for production⚓

If you decide to build this device, you have to download a development kit for the AN2131 from Cypress. The data sheet is not necessary, but useful to understanding.

External downloads for modifications⚓

For recompilation you need ASEM51 und the complete Windows DDK (»Operating Systems«, $699). If you want to sell the device, you have to request a USB Vendor ID (and pay for it! $2500) and to modify drivers and firmware.

How to build⚓

At first place all SMD components, then thru-hole and edge-mount components. Three bigger components mus be bent to be flat, the crystal, maybe tantalum capacitor.

The USB “B” receptacle stays in the middle of the housing. Because there is no edge-mounting component available, this component is used instead and must be soldered at the left and right metal plate. It is recommended to use some sort of justification tool.

When you are complete, you test the circuit with "EZUSB Control Panel" from Cypress. (Windows should request a driver; you satisfy it by supplying the driver from the Cypress development kit.)

Programming⚓

With Cypress' “EZUSB Control Panel” you write the following firmware into the serial EEPROM. No programming device is needed!

Start "EZ-USB Control Panel" (EzMr.EXE) from start menu (installed by Cypress' development kit)
Press button
Give him the file
Stand by!! About 20 seconds.

While prototyping, it is sufficient to leave the serial EEPROM unprogrammed; you may even decide not to have an EEPROM at all.

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

USB2LPT – Cloning instructions for Release 1.2