Nonvolatile_low_voltage_indicator

Published:2009/7/24 5:15:00 Author:Jessie | From:SeekIC

In this circuit, the high-trip voltage VTR2 is set above the normal supply-voltage range. On power-up, the initial condition is A. When S1 is closed momentarily, the operating point changes to B, and remains at B until the supply voltage drops below VTR1, at which time the output reverts to A. Notice that state A is always retained if the supply voltage is reduced below VTR1 (even to 0 V) and then raised back to VNOM. Figure 9-21B shows the equations to calculate resistor values.



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