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QT60486-AS-G Datasheet(PDF) 8 Page - Quantum Research Group |
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QT60486-AS-G Datasheet(HTML) 8 Page - Quantum Research Group |
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8 / 32 page  FMEA error flags are cleared. Any FMEA errors will be reported as the tests are performed for the first time. The FMEA testing is done on all enabled keys in the matrix, and results are reported via the serial interface through a dedicated status command (page 15). Disabled keys are not tested. The existence of an error is also reported in normal key reporting commands such as Report 1st Key, page 15. Assuming no detect events occur, the real time that elapses from the start of one sequence of FMEA tests to the start of the next, i.e. the FMEA sequence time, never exceeds 2s. Also, since the devices only communicate in slave mode, the host can determine immediately if the QT has suffered a catastrophic failure. The QT can also participate in cross-checking the integrity of the host controller, and even reset the host if no communications have been heard from it in a short while (via the LED pin output, page 23). The FMEA tests performed are: X drive line shorts to Vdd and Vss X drive line shorts to other pins X drive signal deviation Y line shorts to Vdd and Vss Y line shorts to other pins X to Y line shorts Cs capacitor checks including shorts and opens Vref test Other tests incorporated into the devices include: A test for signal levels against a preset min value (LSL setup, see Section 5.15, page 23). If any signal level falls below this level, an error flag is generated. CRC communications checks on all critical command and data transmissions. ‘Last-command’ command to verify that an instruction was properly received. Loss of communications reset of the host controller. For those applications requiring it, Quantum can supply sample FMEA test data on special request. lQ 8 QT60486-AS R8.01/0105 |
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