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Building PC Serial Self Power ...

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maziar

maziar

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i need build rs232 self power interface with bidirectional serial interface
with mcu

have any info to do it ?
 

Hi Elavionic,

A little comment about the circuit in your wxx.hut.fi link. If you want to get 5V from the serial port I wouldn't recomment using a 7805; their efficiency is quite low and they're not recommended in situations like these where the input current is low. Better use a LDO regulator or at least a simple DC/DC converter; you can find a lot of very good LDO regulators and DC/DC converters at the Max*im IC website.
 

nice info but ineed more help
how serial output of 89c2051(12) to rx/tx to mcu when bus power system ?
 

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