I have an old legacy digital display and I'd like to wire it such that all of the digits light up when I press a momentary push button. This is for testing the LED display to verify all are in working condition. The 3 1/2 digits should illuminate "-1.8.8.8" as verification. I think some digital displays have these input functions built in already, but my AD2021 doesn't appear to have it.
Can someone with more experience than myself provide some instructions on how to illuminate all the digits to accomplish this test? I have some ideas of my own based on the Boolean logic gate symbol diagram in figure 2, but I don't want to go trying random things for fear of breaking the display. Perhaps connecting terminals L, 7, 12, and P in parallel to the signal common of the power supply would illuminate all digits on the display?
Here's the datasheet:
AD2021 Datasheet
Can someone with more experience than myself provide some instructions on how to illuminate all the digits to accomplish this test? I have some ideas of my own based on the Boolean logic gate symbol diagram in figure 2, but I don't want to go trying random things for fear of breaking the display. Perhaps connecting terminals L, 7, 12, and P in parallel to the signal common of the power supply would illuminate all digits on the display?
Here's the datasheet:
AD2021 Datasheet