Some time ago, I purchased interesting russian LED digital display 490IP1 (К490ИП1) from Ebay. According to information from seller, it was used mostly in avionics and military applications because of the small size. This display measures only 12mm x 5mm!
Now, how to hook it up to a microcontroller? 490IP1 has only few pins for control, so after some experiments I found that:
pin#9 -DOT control
pin#2 -Display Blank
pin#6 -Reset
pin#7 -Count
pin#1 -Display power 5V
pin#5 -Logic power 5V
pin#8 -GND
You may think that this is something like HDSP1414 or NSM1416 because it has some control logic inside but it appears that 490IP1 is a simple decade counter with separate power for display itself and control logic! Just apply reset to start then toggle count pin until desired digit is reached, you can also turn off the display during the count with pin#2. I believe these displays are stackable and you can use pin#4 for this purpose. Basically control looks similar to TIL307 but display features are significantly reduced comparing to Texas Instruments TIL307 version.
CY8CKIT-042 kit from Cypress was selected for this experiment as it has 5V tolerant MCU. Simple test code.
Picture from datasheet:
Video
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