16f628A and a LED Display Driver

Guest · Posted: Mon Oct 16, 2006 9:27 pm

What are some choices for 7 segment LED display drivers? I want to hook up just one for now, and upto 4 later on. The PIC I will be using is a 16f628A

bsodmike · Joined: 05 Aug 2006 Posts: 52

Rather than using the traditional driver, which only (afaik) allows BCD digits + dp control, you can multiplex the lines by hand, and all this means is that you'll have,

a,b,c,d,e,f,g,dp
driver lines

So this allows up to (n) devices depending on how many driver lines + 8 i/o for display data. So what you need to do is 'rasterise' the display fast enough and if you keep it to >100Hz it should appear as steady text/letters Smile

//Of course the max number of digits will be limited by the speed of your MCU and if you can keep refreshing it > 100Hz.

I did something similar here,

Characters you can create (without being restricted, apart from ROM for the fonts),
http://en.wikipedia.org/wiki/Seven-segment_display

Btw, I got a load of these PCBs left, so let me know iif you'd like one or more Smile

Guest · Posted: Tue Oct 17, 2006 5:59 pm

Yeah Id be interested in one or possiblly two.
How much are they?