weijie
Jun 24 2008, 11:29 PM
i been given assignment relating to 8051 microcontroller . how ever , i got some problem when interfacing 8051 with a high to low voltage shifter (74HC4050) .
i nid to feed a input from 8051(5V) into a SD memory card which only receive maximum voltage of 3.3V .
anyone know how to interface ?
can i just direct connect the output from 8051 to 74HC4050 then from tat into SD ?
how i ensure tat the output voltage from 74HC4050 wil drop from 5V to 3.3v at least ?
thank you
i nid to feed a input from 8051(5V) into a SD memory card which only receive maximum voltage of 3.3V .
anyone know how to interface ?
can i just direct connect the output from 8051 to 74HC4050 then from tat into SD ?
how i ensure tat the output voltage from 74HC4050 wil drop from 5V to 3.3v at least ?
thank you
Ajay
Jun 25 2008, 10:50 PM
just connect 5V test signal to 74HC4050 and see if you are getting 3.3V at the o/p.
make sure that 74HC4050 is not bi directional so you might have problem when reading from SD Card.
make sure that 74HC4050 is not bi directional so you might have problem when reading from SD Card.