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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92163 датащи(PDF) 88 Page - STMicroelectronics |
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ST92163 датащи(HTML) 88 Page - STMicroelectronics |
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88 / 224 page  88/224 ST92163 - RESET AND CLOCK CONTROL UNIT (RCCU) 5.8 LOW VOLTAGE DETECTOR (LVD) RESET The on-chip Low Voltage Detector (LVD) gener- ates a static reset when the supply voltage is be- low a reference value. The LVD works both during power-on as well as when the power supply drops (brown-out). The reference value for the voltage drop is lower than the reference value for power- on in order to avoid a parasitic reset when the MCU starts running and sinks current on the sup- ply (hysteresis). The LVD circuitry generates a reset when VDD is below: –VLVDUP when VDD is rising –VLVDOWN when VDD is falling The Low Voltage Detector circuitry resets only the MCU and it does not change the external RESET pin status: no reset signal for an external applica- tion is generated. Figure 47. Low Voltage Detector Reset Function Figure 48. Low Voltage Detector Reset Signal Note: Refer to Electrical Characteristics for the values of VDD,VLVDUP and VLVDDOWN. Low Voltage Detector Reset VDD RESET Internal Reset (External pin) Internal Reset VDD VLVDUP VLVDDOWN |
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