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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STGAP1ASTR датащи(PDF) 42 Page - STMicroelectronics |
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STGAP1ASTR датащи(HTML) 42 Page - STMicroelectronics |
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42 / 70 page  Functional description STGAP1AS 42/70 DocID029344 Rev 2 7.14.5 DESAT comparator check The purpose of this security check is to verify the functionality of the desaturation comparator. To perform this test, the following procedure has to be followed: Set SD = low Send StartConfig command Set DESAT_EN = '1' Set DESCHK = '1' Send StopConfig command Set SD = high Wait 3 µs Apply at the inputs a gate turn on pulse longer than 500 ns Read DESAT flag – DESAT = '1' → OK (VDESATcomp > VDESATth) – DESAT = '0' → FAIL (VDESATcomp < VDESATth) During this test GON is first turned on and then turned off as soon the test succeeds. In case the test should fail, the output remains on as long as the input signal remains high. At the end of the check the DESAT fault remains set (it is latched), and it has to be cleared. Figure 19. DESAT comparator check circuitry Floating Section Control Logic Floating ground DESAT VH GON GOFF VL CLAMP GNDISO VDESATth IDESAT + VH Level Shifter testcontrol testcontrol SD SDO CK SDI SPI I S O L A T I O N 1k Cblank CS IN+ IN- Control Logic |
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