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Why don't they make this IC?

Discussion in 'Electronic Design' started by Harry Dellamano, Sep 30, 2005.

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  1. I am using LEDs on PCBs as visual test points more and more as I'm sure
    most of you do. Wouldn't it be nice if an low cost (<$2/10) IC was available
    in let say a SOT-23-5 package that contained a 8 bit ADC, VCO and LED
    driver. With a analog input range of 0 to 3.0VDC to pulse the output LED
    from 0.20HZ to 20HZ full scale ( from off to full on). The output PPS and
    duty cycle would have to be optimized so the human eye could resolve at
    lease 5% analog input changes. Maybe a two color LED could get us to 1%. The
    extra pin on the package is for the timing cap.
    What say you smart guys?
  2. Harry Dellamano wrote...
    I think you can easily do most of that with Microchip's smallest uP
    driving an LED.
  3. It wouldn't be very hard to program a PIC10F220 micro to do that (no
    cap required). SOT23-6 package. I believe it would meet your price
    point as well.

    Best regards,
    Spehro Pefhany
  4. I'm using LEDs as visual testpoints less and less.
    I'd rather use something else. Be that a single pin,
    where I clock bytes and words out serially, be that
    the UART, or the SPI.

  5. Phil Hobbs

    Phil Hobbs Guest

    It's called an LMC555, one cap, and 3 resistors.


    Phil Hobbs
  6. How interesting Win and Sephro.
    I thought a MPU was for control and data crunching but now you say it is a
    simple LED VVM (Visual Volt Meter). I guess I fell in an analog hole and
    lost sight of Digital's vast capabilities.
  7. Ken Smith

    Ken Smith Guest

    3 Resistors + 1 cap + 1 SO-8 is a lot more space than a PIC.

    Someone could go into business selling pre-programmed PICs for this job.
  8. Phil Hobbs

    Phil Hobbs Guest

    Wouldn't want to discourage you, but don't start clipping your coupons
    too early.


    Phil Hobbs
  9. Guest

    The recent idea, that analog is dead and that digital is the only way to
    go, is popular. However, digital's reportedly vast capabilities are in reality
    only half-vast.

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