TN0941 Datasheet, PDF (1/16 Pages) STMicroelectronics – When to and why use reset and supervisor ICs

TN0941
Technical note
Reset and supervisor ICs: frequently asked questions (FAQ)
Introduction
• When to and why use reset and supervisor ICs?
• What is the difference between a voltage detector and a reset IC?
• What are the main reset and supervisor IC categories?
• Why should I use a standalone reset IC if one is already integrated in the microcontroller?
• What are the following core features of reset and supervisor ICs used for?
– Power-on reset (POR)
– Low-voltage detect (LVD)
– Manual reset (MR)
– Reset pulse width (t_REC)
– Push-pull and open drain reset outputs
• What are the following additional options of reset and supervisor ICs used for?
– Backup battery switchover
– Battery freshness seal
– Watchdog
– Chip enable gating
– Early power fail
– Anti-tampering functions
– Reset input delay time (t_SRC)
• What is a Smart Reset™ and what is it used for?
• With Smart Reset™ devices, is the reset asserted repeatedly if a push-button is pressed
for a long time?
August 2013
DocID023775 Rev 1
1/16
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