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power switching/distribution circuit needed

Mirko Kohns
Prodigy 10 points

I have trouble figuring out an appropriate power switching/distribution circuit design for the following problem:

I hava a mikrocontroller based datalogger which should operate with 3 power supply lines:

1.) non-rechargeable coin-button-battery (3V)

2.) USB Power (5V)

3.) External Power (12V)

The datalogger needs 3.0-3.3V at maximum 80mA. Typical 10mA. (low-power-application)

The battery voltage should be uses as is. (3.0V)

The USB and External Power should be regulated to 3.3V

No Charger required.

The power supply dominance chart looks like this:

 

non-rechargeable coin-button-battery (3V) disconnected disconnected disconnected connected connected connected connected
USB Power (5V) disconnected connected connected disconnected disconnected connected connected
External Power (12V) connected disconnected connected disconnected connected disconnected connected
Datalogger exclusive supplied by External Power USB External Power Battery External Power USB External Power

 

I appreciate any ideas, help and questions

MIRKO

 

  • 0
    Prodigy 195 points

    Hi Markus,

    Have you found a solution to your problem in the meantime? Unfortunately I haven't found something suitable so far yet. Since my application is more or less the same as yours (but no ext. power, 9V battery input,respective same dominance preferences) I would also appreciate any suggestion to that issue.

     

    best regards,

    Frank