This page describes how I tested a TPS3420 reset chip on a breadboard. First I glued the chip in dead bug style on a SMD adapter board:
Then I tinned the pads of the IC and of the SMD adapter (the pink things at the left side are my fingers) :
For connecting the pads of the IC to the pads of the adapter, I used enameled wire, AWG 36 (0.12 mm diameter) :
To remove the enamel, I used a scrap board and some more tin. The lacquer melts after some time and the wire gets tinned as well:
Then I soldered one side of the wire to the SMD pad, first, and cut it to length. The scratches on the IC are in the flux residue, when I tried to position the wire with a scalpel. You need eagle eyes or a good microscope to do this.
Then I soldered the other end the IC pad:
If you move the soldering iron to strong, or apply too much heat or for too long, pads disappear, as happened for me. Buy some spare part.
Finally I plugged in some pin headers in a breadboard and placed the SMD adapter on it. This guarantees that the pin headers are straight when soldering.
Connected in a testing circuit:
Testing: green is both button inputs and yellow is the reset output.
As specified in the datasheet, reset triggers after holding down both button inputs for 12.5 s, with TS=VCC configuration.
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Cool description of the process! That's the way I will be soldering my wires to the TMP112 chips for my logger. Can't glue it down unfortunately. I'll have to find a way to fixate the chip while soldering wires to it. I guess I'll use some kind of mini vise or my smd tweezers :)
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FYI: your datasheet link is messed up: http://http//www.ti.com/lit/ds/symlink/tps3420.pdf
Correct one is http://www.ti.com/lit/ds/symlink/tps3420.pdf
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thanks, fixed
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