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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UM1693 датащи(PDF) 39 Page - STMicroelectronics |
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UM1693 датащи(HTML) 39 Page - STMicroelectronics |
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39 / 196 page  DocID025505 Rev 1 39/196 UM1693 Protection against battery transients 195 Figure 19. Internal structures involved during application of ISO 7637-2 pulse 1 in a monolithic HSD and indication of pin voltages Besides, since the device input may be driven independent from the microcontroller by a separate HW, which is supplied directly from battery, it’s mandatory to decouple the signal coming from the microcontroller to the one coming from the limp home circuitry, in order to avoid any backward supply of one circuit versus the other one. The decoupling is ensured by a signal diode, placed in series to the Limp Home path connected to the device input. Dimensioning of the series resistors on I/O line The resistor value should be calculated according to the maximum injected current to I/O pin of the used microcontroller. That value can be assumed about 10 mA. So that, the resistors value should be at least 15 k Ω (150 V/10 mA): Ri ≥ 15 kΩ |
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