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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC5604B датащи(PDF) 27 Page - Freescale Semiconductor, Inc |
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MPC5604B датащи(HTML) 27 Page - Freescale Semiconductor, Inc |
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27 / 72 page  Electrical characteristics MPC5604B/C Microcontroller Data Sheet, Rev. 4 Freescale Semiconductor 27 4.9.2 Voltage monitor electrical characteristics The device implements a Power-on Reset (POR) module to ensure correct power-up initialization, as well as four low voltage detectors (LVDs) to monitor the VDD and the VDD_LV voltage while device is supplied: • POR monitors VDD during the power-up phase to ensure device is maintained in a safe reset state • LVDHV3 monitors VDD to ensure device reset below minimum functional supply • LVDHV5 monitors VDD when application uses device in the 5.0 V ± 10% range • LVDLVCOR monitors power domain No. 1 • LVDLVBKP monitors power domain No. 0 NOTE When enabled, power domain No. 2 is monitored through LVD_DIGBKP. Figure 9. Low voltage monitor vs reset 3 This capacitance value is driven by the constraints of the external voltage regulator supplying the V DD_BV voltage. A typical value is in the range of 470 nF. 4 External regulator and capacitance circuitry must be capable of providing I DD_BV while maintaining supply VDD_BV in operating range. 5 In-rush current is seen only for short time during power-up and on standby exit (max 20µs, depending on external capacitances to be load) VDD VLVDHVxH RESET VLVDHVxL |
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