Hi,
I have a question: In my design I have 2 power input: USB (5V) and Serial+Power Jack (9V). I see in differents computar that the voltage in the USB port not is 5.0V exactly. I want to know which is the best way for implement a automatic xor and power switch regulate for ouput
5V 500mA. The idea is that is the user connect the USB the hardware have power and communication for the USB PORT and if connect the Serial +Jack the hardware have power for this last. And is connect the two together the priority is the USB.SERIAL+JACK------|====================| | XOR SWITCH REGULATE |---------OUPUT 5V
500mA USB---------------------|====================|The other point is that I use a SuperCap for battery operation, is the user disconnect the USB and/or the SERIAL+JACK the hardware can finish the operation. How to put the SuperCap in the this design.
Which is the best design for this problem???????
Thank you very much!! for help me.
Best Regards,