Checking interconnections without test pins


Interface JTAG Page 1 Image 0001


Testing printed circuit boards by hand is difficult, if not impossible, when using complex ICs and multilayer printed circuit boards. Fortunately most of these ICs now contain special logic which allows extensive testing of the chip’s internal connections and the interconnections on the circuit board. This is achieved by using the internationally standardised JTAG-interface.




A great challenge that we always find is how to physically access targets smaller than 14 mils! Customers such as Flextronics, Foxconn and others present us projects with this difficulty.

If the commercial and conventional technology has great precision, typically access targets not less than 25 mils!


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