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SN74HC595: Can I use PWM on the Output Enable line to effect dimming?

Charles McClelland
Prodigy 250 points
Part Number: SN74HC595

I am using this device to drive a 7 segment display.  Can I get a dimming effect with PWM on the Output Enable line?  Any guidance on duty cycle, frequency or filters?

Thanks, Chip

  • 0
    TI__Genius 16735 points

    Hi Chip,

    Yes it is possible to place a PWM signal on the enable pin of the SN74HC595D. This will create a dimming effect on your 7 segment display.

    You shouldn't need any filters or any additional pieces to the circuit. You can refer to the pulse duration parameter in the timing requirements section of the datasheet to figure out whats the maximum frequency or duty cycle you can operate at. However something in the kHz should be no issue.

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Prodigy 250 points

    Thank you - all set