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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM704RDS6E датащи(PDF) 11 Page - STMicroelectronics |
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STM704RDS6E датащи(HTML) 11 Page - STMicroelectronics |
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11 / 31 page  11/31 STM690/704/795/802/804/805/806 Power-fail Input/Output (NOT available on STM795) The Power-fail Input (PFI) is compared to an inter- nal reference voltage (independent from the VRST comparator). If PFI is less than the power-fail threshold (VPFI), the Power-Fail Output (PFO) will go low. This function is intended for use as an un- dervoltage detector to signal a failing power sup- ply. Typically PFI is connected through an external voltage divider (see Figure 11., page 8) to either the unregulated DC input (if it is available) or the regulated output of the VCC regulator. The voltage divider can be set up such that the voltage at PFI falls below VPFI several milliseconds before the regulated VCC input to the STM690/704/795/802/ 804/805/806 or the microprocessor drops below the minimum operating voltage. During battery back-up, the power-fail comparator is turned off and PFO goes (or remains) low (see Figure 14., page 11). This occurs after VCC drops below VSW (2.4V). When power returns, the pow- er-fail comparator is enabled and PFO follows PFI. If the comparator is unused, PFI should be con- nected to VSS and PFO left unconnected. PFO may be connected to MR on the STM704/806 so that a low voltage on PFI will generate a reset out- put. Applications Information These Supervisor circuits are not short-circuit pro- tected. Shorting VOUT to ground - excluding pow- er-up transients such as charging a decoupling capacitor - destroys the device. Decouple both VCC and VBAT pins to ground by placing 0.1µF ca- pacitors as close to the device as possible. Figure 14. Power-fail Comparator Waveform (STM690/704/802/804/805/806) AI08861a VCC VRST VSW (2.4V) trec RST PFO PFO follows PFI PFO follows PFI |
Аналогичный номер детали - STM704RDS6E |
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Аналогичное описание - STM704RDS6E |
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