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ST72141K2-AUTO Datasheet(PDF) 21 Page - STMicroelectronics |
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ST72141K2-AUTO Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 131 page  ST72141K2-Auto 21/131 RESET MANAGER (Cont’d) Internal Low Voltage Detection RESET (option) Two different RESET sequences caused by the in- ternal LVD circuitry can be distinguished: - LVD Power-on RESET - Voltage Drop RESET In the second sequence, a “delay” phase is used to keep the device in RESET state until VDD rises up to VLVDr (see Figure 12). Figure 12. LVD RESET Sequences RESET RUN INTERNAL RESET 4096 CLOCK CYCLES FETCH VECTOR POWER- RESET PIN EXTERNAL RESET SOURCE WATCHDOG RESET RESET RUN INTERNAL RESET 4096 CLOCK CYCLES FETCH VECTOR RUN RESET PIN EXTERNAL RESET SOURCE VDD VDDnominal WATCHDOG RESET DELAY VLVDr VLVDf VDD VDDnominal VLVDr OFF |
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