I'm in need of a chip to drive a pair of 7 segment by 6 digit LCD displays. Each display has 50 pins (1 earth, 48 segments and I think 1 NC). It seems everything I search for is designed for dot matrix style displays with a bazillion pixels. Would it be possible to run the 2 displays off the same chip and somehow alternate between the 2 (switching the earth I presume) or would I need to drive all 96 segments seperately.
Thanks, Michael
The LCD panel should also have an input for the backplane signal. This cannot be DC or the panel will be damaged.
You will need a flip flop per segment to hold the data to the segment inputs. The flip flop inputs can be multiplexed to save on processor I/O ports.
Any chance you can read the display part number?
You could use two of these from Rockby:
The datasheet shows slaved examples of the IC.
Make that: Three slaved IC's for five odd bucks each to get 120 segments.
s.
sor
Could also look at silicon chips "USB CLOCK" Project. This drives a similar sort of LCD from a PIC, using a couple of IC's.
On Mon, 12 Jan 2009 16:01:54 -0800 (PST), kreed put finger to keyboard and composed:
- Franc Zabkar
I don't have the display with me but it's your standard 7 segment x 6 digits display (I have 2 of these to drive). Much like the display in this pic except 6 digits.
Thanks Mark, that's pretty much perfect. Input is serial, it has 2 backplanes, it's available at digikey and it's cheap. The only downside is I can't do it all with 1 chip :-) I2C would be an advantage but I've got lots of spare pins so not really necessary.
Michael
Thanks, I will have a look.
Michael
I should be able to get away wih 2 of the 64 segment chips as I've got 2 displays and can put 1 on each backplane.
Michael
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