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ASM706EPA Datasheet(PDF) 6 Page - PulseCore Semiconductor |
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ASM706EPA Datasheet(HTML) 6 Page - PulseCore Semiconductor |
6 / 15 page ASM705/706/707/708 April 2008 ASM813L rev 1.6 Low Power µP Supervisor Circuits 6 of 15 Notice: The information in this document is subject to change without notice. Monitoring a Negative Voltage The Power-Fail circuitry can also monitor a negative supply rail. When the negative rail is OK, PFO will be LOW, and when the negative rail is failing (not negative enough), PFO goes HIGH (the opposite of when positive voltages are monitored). To trigger a reset, these outputs need to be inverted: adding the resistors and transistor as shown achieves this. The RESET output will then have the same sense as for positive voltages: good = HIGH, bad = LOW. It should be noted that this circuit’s accuracy depends on the VCC line, the PFI threshold tolerance, and the resistors. |
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