• on Computer/Software/Internet
  • Published in issue 3/2009 on page 54
About the article

USB-I2C Bridge

Easyspeak I-square-C using 1-Wire

USB-I2C Bridge
Modern computers no longer come with parallel or serial ports fitted. Although these ports see declining use in practice, to designers, a portless PC is a nuisance. To solve at least a part of the problem, we present an interface for the I2C bus for connection to an USB connection on your PC. It works a treat when used in the LabVIEW environment.
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Products
Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.

Resistors
(all 0805 shape)
R1 = 1kohm5
R2,R3 = 27ohm
R4,R5 = 4kohm7

Capacitors
C1 = 1µF (0805)
C2 = 4µF7 (0805)
C3 = 100nF (0805)
C4-C7 = 33pF (0603)

Inductors
L1,L2 = BLM21PG221SN1J (Murata) (220ohms at 100 MHz)

Semiconductors
IC1 = MAX8881EUT33+ (Maxim Integrated Products)
IC2 = DS2490S+ (Maxim Integrated Products)
IC3 = DS2413P+ (Maxim Integrated Products)

Miscellaneous
K1 = USB connector, PCB mount, type B
K2 = RJ-11 connector, PCB mount
X1 = 12MHz quartz crystal
PCB, ref. 080655-1, from www.ThePCBShop.com
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