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データシートサーチシステム |
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データシートサーチシステム |
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L9300 データシート(PDF) 80 Page - STMicroelectronics |
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L9300 データシート(HTML) 80 Page - STMicroelectronics |
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80 / 182 page  Figure 46. WD enable/disable function GADG0408170843PS 13.1.1 PRUN over frequency detection PRUN Over Frequency Detection PRN frequency error is detected if the frequency is higher than 1 kHz and is not detected if the frequency is lower than 750 Hz. In other words, when the interval between PRN rising edges is less than 1ms, watchdog detects PRUN over frequency and doesn't clear the WDT counter. In addition, if this condition continues during Toff, RES1 pin drives low. Table 49. How PRN frequency effects PRUN PRN frequency Effect on PRUN logic from 0 Hz to 750 Hz PRN width counter surely reset. No RES1 generated from 750 Hz to 1 kHz Gray area. No action guaranteed from 1 kHz PRN width counter not reset. RES1 generated L9300 PRUN watchdog functional description DS12258 - Rev 4 page 80/182 |
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