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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9300 датащи(PDF) 75 Page - STMicroelectronics |
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L9300 датащи(HTML) 75 Page - STMicroelectronics |
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75 / 178 page  13 PRUN watchdog 13.1 PRUN watchdog functional description The device integrates a window watchdog monitoring the status of PRN input signal to check micro controller activity; when the microcontroller is able to provide at PRN input pin a square wave in range of certain frequency, the watchdog fault is not triggered and RES1 signal stays high by external pull-up resistance. The WDT logic detects the only rising edge of PRN signal in PRN pin. Figure 43. PRUN WD block diagram GADG0308171804PS Figure 44. PRUN WD initialization Toff PRN RES1 RES2 VDD3 WD_DIS (stay low) Detecting only rising edge of PRN signal staying high or low level Switch RES1 low in the condition of PRN Ton_RES1 VSTN Ton_RES2 VSTN VDD3_UV VSTN VDD3_UV VSTN VSTN VSTN Thold_RES2 VDD3_UV_ft TRL TRH GADG0308171837PS L9300 PRUN watchdog DS12258 - Rev 5 page 75/178 |
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