Note that using an identifier in diagnostic modes is useful in understanding what is being
displayed (for example, the identifiers “QTL”, “QTS” and “QTE” in
Figure 5-1).
For products with PPK interfaces, it is useful to have a diagnostic mode that displays an idle
pattern when no keys are pressed, and which cycles the identities of all pressed keys.
6. Pass-through from QT IC to PC
There are demonstration kits and matching PC software for many QT ICs. A diagnostic mode
that passes data directly from the QT IC to the PC (as in the demonstration kits), allows the PC
software to be used to diagnose and tune the product. In some circumstances it is necessary to
configure the product's MCU to buffer data and thus accommodate different data rates and flow
control signals such as DRDY.
7. Production Testing
By keeping production testing in mind during design, diagnostic modes can be embedded in
production jigs.
Key-activated modes can be used by manual test operators to perform and view test results.
Modes selected via external interfaces allow automated test equipment to select tests, retrieve
results for pass/fail logs, and monitor variations in product criteria over the production life of the
product.
3
10704A–AT42–10/08
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