One-Wire Spy

monitor for 1-wire ICs

One-Wire Spy is a useful aid that enables a PC to monitor the communications between a microcontroller and a 1-wire IC from Dallas Semiconductor.The semiconductor manufacturer Dallas Semiconductor offers a series of components that can be controlled, read and programmed by a master device (such as a microcontroller) via a single-wire bus. These ‘1-wire’ devices are mainly available as temperature sensors, battery-management ICs and memory ICs. There is also an identity IC, which contains only an identification serial number. Table 1 summarises the available devices. With a 1-wire bus, it is possible to use not only normal IC packages, but also TO-92, PR-35 and flipchip packages. Dallas Semiconductor even offers ICs in button-cell format, under the name ‘iButton’.

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Materials

000048-11.zip

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.

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PCB

Download Gerber file: 000048-1.zip

Component list

Resistors:
R1,R4 = 10k?
R3 = 47?
R5 = 220?
R6 = 20k?
R7 = 5k?
R9 = 680?
Capacitors:
C1-C4 = 1µF 16V radial
C5-C8 = 15pF
C9,C10,C11,C21,C22 = 100nF
C14 =
C20 = 100µF 50V
C23 = 10µF 16V
Semiconductors:
D1 = 1N4148
D2 = LED, 3 mm, red
D5 = LED, 3 mm, green
Br1 = B40C1500 (40V piv, 1.5A peak)
T1 = BC547
IC1 = CY7C42x1 (Cypress Semiconductor)
IC2 = MAX232CPE (Maxim)
IC3 = PIC16C54 (programmed, order code 000048-42)
IC4 = PIC16F84 (programmed, order code 000048-41)
IC5 = 7805
IC6 = 74HCT00
Miscellaneous:
X1,X2 = 10 MHz quartz crystal
S1 = miniature pushbutton, 1x make contact
Bu1 = 9-way sub-D socket (female), PCB mount
Bu2 = Mains adaptor socket, PCB mount, 2.1 mm
Sockets for all ICs (except IC5)
Disk, order code 000048-11