3. A comparator with internal hystersis. With one input from BGR and other from resistor devider.
4. Assume BGR is negative input and resistor devider is positive input. When supply hits its positive threshold, comparator output goes high.
ambreesh said:I shall tell what i have used.
1. A resistor devider. One of the resistors must be adjustable.
2. A BGR
3. A comparator with internal hystersis. With one input frpm BGR and other from resistor devider.
4. Assume BGR is negative input and resistor devider is positive input. When supply hits its positive threshold, comparator output goes high.
5. this output goes to a switch that connects a current source to a capacitor.
6. Capacitor is shorted to ground by a switch which is controlled by the first comparator output.
7. Charging of the capacitor determines the delay time.
8. Feed the output of the capacitor and BGR to anaother comparator. Once the cap charges beyond BGR voltage the POR is deasserted.
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