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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7803A датащи(PDF) 30 Page - STMicroelectronics |
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TDA7803A датащи(HTML) 30 Page - STMicroelectronics |
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30 / 72 page  Functional description TDA7803A 30/72 DS12195 Rev 7 only the channel(s) where the fault happened is shut down. Once activated, the diagnostic procedure develops as below: – The diagnostic performs one restart cycle in order to avoid momentary re- circulation spikes which could give erroneous results. If a normal state (no overloads) is detected, the channel returns back active. – Instead, if after the restart cycle, the overload is still detected, then the diagnostic performs a plateau cycle. – After the plateau cycle, a restart cycle is going to be performed every 2 ms until the fault condition is removed. The data acquired from the plateau cycle are stored and can be read from the microprocessor. If the fault condition persists, a new plateau cycle can be programmed from I2C simply by reading. This ensures continuous diagnostic throughout the car-radio operating time. For a more immediate understanding, the permanent diagnostic's flowchart is as in Figure 36. Figure 36. Permanent diagnostic flow-chart When a plateau cycle is done during the permanent diagnostic the bit DB1/2/3/4-D4 is set to "1". If all the bits related to the diagnostic are "0", then the fault has possibly been removed or not detected. Eventually, an over current event could have been occurred on a GAPGPS00810 PLAY MODE OVERLOAD NO YES TURN-OFF BIG POWERS RESTART CYCLE FAULT DETECTED NO YES FIRST CYCLE AND IB4 D0 = ‘1’ PLATEAU CYCLE YES NO RESTART CYCLE |
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