ltspice CD4000.LIB error messages

Discussion in 'Electronics Resources' started by celtic762, Oct 18, 2013.

  1. celtic762

    Thread Starter New Member

    Jun 14, 2013
    I'm trying to simulate an RGB LED fader using a NE555 and CD4029 running on 9V. I've got the NE555 working in the simulation in astable mode. The problem is getting the CD4029B model to work. :confused:

    I've loaded the CD4000.lib file into the lib\sub folder
    Ive included the Spice directive .include lib\sub\cd4000.lib
    I've set value to CD4029B which is a .SUBCKT in the CD4000.lib file.

    The following warnings come up.

    WARNING: Can't resolve .param vdd1=vdd
    WARNING: Can't resolve .param speed1=speed
    WARNING: Can't resolve .param tripdt1=tripdt

    There are no .param settings for vdd, speed or tripdt set in the file. Are these values found in the manufacturer's documentation?

    Any help would be much appreciated.

    Cheers :)
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    Try set this

    SpecLine VDD=9 SPEED=1 TRIPDT=5e-9
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    You shouldn't need to set that value. The symbol already has a value. Just right-click on the symbol and edit the Vdd value to 9V.
  4. celtic762

    Thread Starter New Member

    Jun 14, 2013
    Thanks! :D I also had to get the pin assignments in the right order as well :rolleyes: