Burkhard Kainka
About the article


allowing access to all ports

USB ports can be used in many applications in the field of electronics. However, unlike the RS232 interface, devices have not become available to interconnect USB and parallel ports. This general-purpose USB UART now rectifies that situation.Just as the legendary AY-3-1015 UART converts between parallel and RS232 interfaces, this Elektor Electronics USB chip provides general-purpose ports accessible over USB. The only extra components required to build a complete USB device are a ceramic resonator or quartz crystal and a couple of capacitors. In total twelve port connections are available, which can freely be written and read. Further, the output current can be set for each port connection, which allows, for example, the brightness of a connected LED to be controlled directly.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1 = 1kOhm 5
R2 = Polyswitch, 100mA
C1 = 100nF
IC1 = CY7C63001A (Cypress), programmed, order code 010207-41
K1 = USB connector Type B
K2 = 14-way boxheader
K3,K4,K5 = 20 solder pins
X1 = 6MHz quartz crystal or ceramic resonator with 2 or 3 pins
PCB, order code 010207-1
Disk, project software, order code 010207-11
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