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Home › Magazines › 2008 › March › The Secrets of I2C

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The Secrets of I2C

An I2C bus analyser to let you satisfy your curiosity

Published in issue 375, March 2008

The Secrets of I2C
This analysed can be used to troubleshoot a reluctant proprietary application or to ‘reverse engineer’ existing applications. The device communicates with a PC via a USB link configured as a virtual port (COMx) and so is powered directlyfrom the USB, avoiding the need for an external mains adaptor (or even batteries).

Components

Relevant websites

Free downloads

Resistors
R1,R2 = 8kΩ2
R3,R4 = 1MΩ5
R5,R6 = 330
R7,R13 = 470
R8 = 4kΩ7
R9,R10 = 10k
R11,R12 = 1k
R14,R15 = 27
R16 = 1kΩ5
Capacitors
C1,C2 = 1nF
C3,C4,C10 = 100nF
C5-C8 = 22pF
C9 = 10nF
C11,C12 = 33nF
Semiconductors
D1 = LED, 3mm, red
D2 = LED, 3 mm, green
T1,T2 = 2N7000
IC1,IC2 = 4538
IC3 = PIC18F4520, programmed, Elektor shop item # 070600-41
IC4 = FT232BM (FTDI)
Miscellaneous
K1 = 6-way RJ-11 socket (vertical)
K3,K4,K5 = 6-way RJ-11 socket (horizontal)
K2 = USB socket, male, type B
L1 = ferrite bead
X1 = 20MHz quartz crystal, HC 49/4H case
X2 = 6 MHz quartz crystal, HC 49/4H case
S1 = miniature pushbutton
S2,S3 = ‘D6’ pushbutton (red and black)
JP1 = 3-way SIL pinheader with jumper
PCB, item # 070600-1
PCB artwork, free download from www.elektor.com
Project software (PC executable and .hex file), item # 070600-11

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
Article PDF
10 Elektor Credits
PCB PDF
Free download
 

Order this magazine 
Magazine March 2008
EN375 (USD 6.30)
 

Order from Elektor 
PCB, bare
070600-1 (USD 27.90)
PIC18F452, programmed
070600-41 (USD 32.10)
 

Free downloads 

Software

Free download
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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