The absolute voltage is not of interest, only referenced to emitter (sometimes collector, too).Can I use a npn/pnp transistor and drive the base with 9V
--> in you simulation it never is 9V!but base will have 9V
--> in simulation a pullup resistor is connected to 3V3!I will connect collector to 3.3V for npn
--> my assumption on this was, that you want the 3V3 for supplying your circuit, instead of a 3V3 logic signal.I need to have a output @ 3.3V.
My concern really is... will surge have effect... I am not sure if i can even refer it as surge (plug unplug of DC Jack)..
Overall your design is poorly defined.
What are all input V ranges?
Is there undervoltage protection (UVP)?
Will transfer voltage be stable during line transient?
What current max do you want for voltage sense signal and how does that affect battery life?
What surge current do you expect?
i.e. What is the ESR of hidden supply caps and what is contact surge current rating? ( Joule rating of discharge/charge affects contact life. of jack )
There will be contact bounce on jack, so will you filter signal in hardware or software?
/QUOTE]
What are all input V ranges? : 8.5 to 10V
Is there undervoltage protection (UVP)? Yes there is
Will transfer voltage be stable during line transient? Expect it to
What current max do you want for voltage sense signal and how does that affect battery life?
The voltage detect signal drives the MCU pin and hence about 20 odd mA. When the DC jack input is detected, the power from the battery is cutoff and all the current is drawn from DC Jack
What surge current do you expect?
i.e. What is the ESR of hidden supply caps and what is contact surge current rating? ( Joule rating of discharge/charge affects contact life. of jack ).
I am really not sure about this part. Need to check but I am not sure if I will get proper details. Let me try.
Contact Bounce on Jack: I would prefer to handle that on hardware but not sure how to do it.
The DC jack voltage drives DC to DC, LDOs and that inturn powers the remaining circuit
If you have the right zener diode, that will prevent incoming voltage from rising above 3.3 V.
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