> I was wondering if someone has an advice for a driver for a 7
> segments display. I need to be able to adjust the brightness of the
> display "in software", with a command. The display drivers I have
> found so far expect an external resistor to set the brightness level

Cristiano, I occassionally use the CMOS 4543

http://www.futurlec.com/4000Series/CD4543.shtml

http://home.clear.net.nz/pages/joecolquitt/counter.gif

(sorry about the inverted colours, I'd change it but my ftp is playing up)

In that circuit there would be a couple of options. Strobe the Blank
pin (which enables the output drivers) or strobe the common cathode
(the ground connection to the right of the LSD) via a FET. Either could
be done with a PWM output

For ICs that expect a resistor to set the current, that resistor could be
selected from a group with a transistor or 4066
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