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MAX7219 question — Parallax Forums

MAX7219 question

SashaSasha Posts: 35
edited 2007-11-26 01:58 in BASIC Stamp
·Is max7219 constant current led driver?
If not, what is difference?

Thanks.

Comments

  • allanlane5allanlane5 Posts: 3,815
    edited 2007-11-26 01:26
    No, it's not constant current.

    The 7219 'scans' through the digits of the LED's it's displaying. You set the scan current with a single resistor, as I recall.

    The difference is, a "constant current" LED driver puts out a lot of current -- up to 20 mA per lit LED. But a 'scanned' LED driver can light up an entire sign on 100 mA or so, spread around fast enough that your eye doesn't see 'flicker'.
  • SashaSasha Posts: 35
    edited 2007-11-26 01:58
    OK, That's I looking for.
    Thank You! smile.gif·
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