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ASM705EPA Datasheet(PDF) 6 Page - Alliance Semiconductor Corporation |
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ASM705EPA Datasheet(HTML) 6 Page - Alliance Semiconductor Corporation |
6 / 15 page 6 of 15 Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM705 / 706 / 707 / 708 ASM813L rev 1.2 July 2004 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. VCC PFI MR PFO VCC R1 R2 ASM70X RESET GND To µP Figure 5: Monitoring a negative voltage 2N3904 R3 R4 VCC - 1.25 R1 = 1.25 - VTRIP R2 Negative Input Voltage + |
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