Philip Pemberton wrote: > In message > Peter wrote: > > >>>I've worked out the pinouts for the display. It has 27 pins, and seems to >>>have the segments and backplanes multiplexed three ways. Very odd... >> >>Very common, you mean. > > Now I've done some research, I will amend my previous statement. Common > indeed, just not with the segment/common wiring my LCD has. I've seen the > datasheet for Maxim's triplex display driver, but near as I can tell there's > no way to use it with these displays - the segment/common wiring is similar > in some places, but completely different in others. > >>You can drive such a display directly with >>tristate outputs. Tristated outputs must be 'pulled' to the relevant >>intermediate voltage with a resistor, each. > > So you keep the pins idled at about 2.5V and either pull high, low or float > them? Hm. Sounds like a plan, but it's going to need a fair few resistors... > Probably 27 (one for each segment/common) and two for the voltage divider. > Owch! Or 27 resistors going to a single pin held at 2.5v (using an op amp). Robert -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist