Lm3915 IC help

Discussion in 'General Electronics Chat' started by BELOWIT, Mar 16, 2014.

  1. BELOWIT

    Thread Starter New Member

    Mar 16, 2014
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    0
    Hello everyone. I'm new here but i need some help as to what each of the feet do within the IC. I've tried data sheets but they are too complicated and i don't understand most of it. Can someone briefly explain what each foot does please?

    Thanks :D

    BELOWIT

    [​IMG]
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,503
    380
    hi,
    Read thru the first 3 pages of this pdf.

    If you have specific questions about a pin/foot, just ask.

    E
     
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  3. BELOWIT

    Thread Starter New Member

    Mar 16, 2014
    3
    0

    What is the point of the reference voltage though?? Please describe with not many technical words please :rolleyes:
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,997
    745
    Rlo and Rhi set the lower and upper voltage limits of the comparators, Refout is the output of the internal voltage regulator, Radj is the regulator adjusment pin, Sig is the input for the comarators, Mode sets the Leds in Bar or Dot mode,

    The internal reference regulator is just an Lm317, used to set the upper and lower limits on the Rhi, Rlo pins, it can be omitted and external voltages placed on the pins to set the limits, however it also sets the current limit on the led output pins.

    hope that answers most of your question
     
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  5. BELOWIT

    Thread Starter New Member

    Mar 16, 2014
    3
    0
    Thanks ^_^ :)
     
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