Hey,
I am trying to link the 5V serial port on my ADuC831 (8051) to the 3.3V serial port on my Analog Devices DSP board. Transmission is one way only (5V -> 3.3V). I have no idea what to do to drop the voltage.
I read somewhere that it should simply be a case of adding a series resistor, the value of which could be calculated by finding out the max current from the data sheets of both boards. However I haven't been able to find any current values on the data sheets.
Should I use a resistor, transistor, a diode maybe??
Greatful for all suggestions!
Thanks
Ronan