Luc Lemmens
About the article

USB Interface for the 1-Wire Bus

from four to two wires

USB Interface for the 1-Wire Bus
The 1-Wire bus from Dallas Semiconductor is very suitable for use in a small (home) network with various switches, sensors and actuators. The simplicity of the hardware is in sharp contrast to the complexity of the protocol on this bus, but fortunately this problem has been solved by the manufacturer with dedicated interface ICs and software that simplifies the communication between the PC and 1-Wire devices.Last April we published a design for a serial interface for the PC, which made it possible to communicate with devices on the 1-Wire bus using development software supplied by Dallas Semiconductor. This month we have an almost identical circuit, but for use with the USB port (USB = Universal Serial Bus). This port is beginning to be used more frequently for connecting peripherals to PCs and Macs. The serial port has now fallen out of favour in that respect. Some people are of the opinion that the trusty old RS232 interface will soon disappear from the PC and certainly from modern laptops. The future will tell if they’re right.
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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,R2 = 27Ohm
R3 = 1kOhm 5
C1-C4 = 33pF
C5,C6 = 100nF
C7 = 1µF 16V radial
L1,L2 = BLM31AJ601SN1 (Murata) (Farnell # 581-094)
D1 = DS9503
D2,D3 = BAT85
IC1 = DS2490
IC2 = LF33CV (Farnell # 302-4520)
K1 = USB connector, type B, PCB mount
X1 = 12MHz quartz crystal
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