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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST10F296 датащи(PDF) 234 Page - STMicroelectronics |
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ST10F296 датащи(HTML) 234 Page - STMicroelectronics |
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234 / 346 page  Obsolete Product(s) - Obsolete Product(s) System reset ST10F296E 234/346 Figure 88. Minimum external reset circuitry The minimum reset circuit of Figure 88 is not adequate when the RSTIN pin is driven from the ST10F296E itself during software or watchdog triggered resets. This is because capacitor C1 keeps the voltage on the RSTIN pin above VIL after the end of the internal reset sequence, thus triggering an asynchronous reset sequence. Figure 89 shows an example of a reset circuit. The R1-C1 external circuit is used to generate power-up or manual reset and the R0-C0 circuit on RPD is used for power-up reset and to exit from power-down mode. Diode, D1, creates a wired-OR gate connection to the reset pin and may be replaced by an open-collector Schmitt trigger buffer. Diode, D2, provides a faster cycle time for repetitive power-on resets. R2 is an optional pull-up for faster recovery and correct biasing of the TTL open collector drivers. Figure 89. System reset circuit RSTOUT RPD RSTIN C1 Hardware reset VCC + C0 R0 For power-up reset (and interruptible power-down mode) External hardware + ST10F296 RPD RSTIN VDD + C0 R0 External hardware VDD R2 + C1 R1 D2 D1 External reset source Open-drain inverter VDD ST10F296 Obsolete Product(s) - Obsolete Product(s) |
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