STM32F030R8 and common anode 7 seg display

[Nimit Vachhani]

Posted on May 11, 2018 at 07:10

Greetings People,

I want to interface 6 common anode 7 segment display with my STM32F030R8. Any idea on schematic ?  I have interfaced it with 8051 but and i have used Max7219 with STM32F030R8.

I don't want to go for Max7219 because dude to any noise in power line my Max7219 stops working. 

Any guidance will be helpful thanks.

#7-segment-display #7-segment-display-multiplexing

[T J]

Posted on May 11, 2018 at 08:26

Yes, the 8051 was a bit flakey with any length reset line.

The STM32 chips are much more robust and stable.

There are more economical solutions over the Max chip, like

https://www.digikey.com/products/en/integrated-circuits-ics/pmic-display-drivers/729?FV=980006%2Cffe002d9%2C5f80001%2C5f80015%2C5f8003a%2C5f8003b&quantity=&ColumnSort=1000011&page=1&pageSize=25

 

I used discrete components before, to save more money, how many pieces do you need to make ?

ie. ULN2003 

https://www.digikey.com/product-detail/en/diodes-incorporated/ULN2003F12FN-7/ULN2003F12FN-7DITR-ND/5054226

 

and another transistor array for the digit select drive.