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TN0941 Datasheet(PDF) 2 Page - STMicroelectronics |
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TN0941 Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 16 page ![]() Contents TN0941 2/16 DocID023775 Rev 1 Contents 1 When to and why use reset and supervisor ICs? . . . . . . . . . . . . . . . . . 4 2 What is the difference between a voltage detector and a reset IC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 What are the main reset and supervisor IC categories? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 Reset and voltage detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 Microprocessor supervisors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.3 Smart resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.4 Watchdog timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.5 Voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Why should I use a standalone reset IC if one is already integrated in the microcontroller? . . . . . . . . . . . . . . . . . . . . . . . 6 5 What are the following core features of reset and supervisor ICs used for? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.1 Power-on reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.2 Low-voltage detect (LVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.3 Manual reset (MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5.4 Reset pulse width (tREC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5.5 Push-pull and open drain reset outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 What are the following additional options of reset and supervisor ICs used for? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.1 Backup battery switchover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.2 Battery freshness seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.3 Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.4 Chip enable gating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.5 Early power failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.6 Anti-tampering functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.7 Reset input delay time (tSRC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 |
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