Hi, I'm trying to hook up a common cathode 7-segment LED display with a (common cathode) BCD to 7-segment driver.
Heres how I connected everything:
driver VDD to +5V
driver VSS to ground
driver BCD wires to atmega8 I/O pins
driver active low latch enable pin to ground
driver output to respective 7-Segment anode pins
7-segment common cathode to a resistor then to ground
When I had it connected this way, the LED display was very dim and would change and flicker if I got near the signal wires from the mcu to the driver (literally, if I waved my hand over it). If I touched the signal wires they seem to stablize a little more. I also tried connecting the signal wires directly to +5V and ground with the same results.
Then I connected VDD to +15V. The LED display got brighter, but I still had the same flicker/change problem. Then I also connected the the signal wires to +15/Gnd. It seemed to help with the flicker, but it still seems like it acts funny.
Probably the main problem is that driver datasheet, especially the "DC Characteristics" section, is very confusing to me. Can someone please shed some like on the situation? Thanks!!