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There is virtually an
unlimited number of different ways in which leads can be made up for your
EEPROM connections.
Below are some suggestions to get you started.
All KeyMakers are shipped with a 4 way lead and a 4 way dual male header.
KMX1
KMX2
There are many different ways that you can take in making
up your own probes to use with your KeyMaker.
Below is one way it can be done.
Above the finished article connected to
the KeyMaker board's I2C connector
Dual 4 way male header inserted into the
end of the 4 way lead with additional cables soldered to one side of the
header, colours matching the layout of the KeyMaker board's I2C Connector below.
Note: Ordinary sticky tape used for
insulation.
If you do not have a soldering iron, you
can strip the ends of the new cables, twist the end if using
multi-strand wire and push the wire directly into the female end of the
4 way cable, then hold the cable in place by wrapping with sticky tape.
At the other end of the cable a long
steel pining needle (no, NOT stainless steel as that will NOT
work)
Note the insulation provided in 2 places
by sticky tape, at the top to prevent sweaty fingers interfering
electrically and at the tip to prevent short circuit in places where the
pins ends very close to each other, see R52 photos further down this
page.
In my example the wire is soldered, you
could also wraps the stripped end of the cable around the pins and cover
with sticky tape.
Label the 2 cables SCL and SDA near the
needles.
For the GND connection we use a larger
hook clip, it needs to be larger as it usually connected to a metal
bracket inside the TP for the GND connection. Read more on -> GND
connection
All done.
You can also use heat shrink tubing to insulate
your probes
Now putting it to use on 2 versions of
the R52
The black GND hook on the left above, connected
to the metal fingers which hold the memory in an R52
Photo from the EEPROM location pages,
showing the connections for this version of the R52
Now you can appreciate the need to wrap
the lower part of the pins with insulating sticky tape or heat shrink
tubing as the needles do
end up very close together.
The other version of the R52 board.
Again
the connections from the EEPROM location page
The probes applied to SDA and SCL, this
time they are even closer together, so it is a good idea to have the ends
of your probes insulated with either sticky tape or heat shrink tubing.
Note the GND clip on the left clipped to
the metal finger which normally holds memory in place.
Other ways to make your leads.
The Pomona SMD Grabber Test Clip Patch Cord is ideal for
clipping your SDA and SCL leads to EEPROM pins.
You only need one test lead, cut the cable in half and
use one half for SDA and the other half for SCL, you should attach a label
near the end so you don't confuse the 2 leads.
You can find the Pomona leads easily by searching on the
net.
Below, photo from a customer who purchased 2 different
colour Pomona SMD Grabbers (pairs), cut them in half and used one Red and
One black clip for SDA and SCL plus a larger black clip for GND
Pomona clips applied to an 8 pin 24Rf08.
NOTE: You will need very good
lighting and a magnifying glass to attach these, these are large macro
photos, the actual 24RF08 and its pins are very small.
STRAIN RELIEF - you can
easily apply sufficient force to damage the 24RF08 pins with these clips,
take care.
To avoid damage, make sure you place no strain
to the pins by using adhesive tape to tape the cable a short distance from
the pins so that any pulling on the other end of the cable does not
translate to strain on the 24RF08 pins.
These clips can also be used with the 14
pin 24F08 which has even more delicate pins, so the strain relief and
care is even MORE IMPORTANT.
Another customer supplied photo, he used the supplied 4
way cable connected to a Pomona SOIC-CLIP 5250 which is suitable for
connection to an 8
pin SOIC for example the 8 pin 24RF08
Disclaimer
I make no warranty that any of my
information is correct, or safe, or does or does not breach any warranty
clause, or anything else, it is up to you to decide if you will
follow all or any of the instructions to recover the Supervisor Password
from a TP. It is up to you to decide, I am not responsible for the
results or for any consequential or incidental damages whatsoever.
