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STD 7 Seg Display using DM9368N
Mode: Editors' pick
8 bit parallel to dual 7 segment display module using DM9368N.
Not clocked and suitable for breadboarding as part of my SPAM-1 cpu build.
The DM9368N will work fine without any resistors as it has current limiting however it drives at up to 20mA, but I want to limit the current a bit more so it's not as power hungry.
To save space I'm using a single resistor on the common cathode of the display which is a bit of a compromise.
This approach means that the display brightness may flicker as the number of illuminated digits changes.
However, the better design of one resistor per segment takes up a lot more space. I'd probably want to use a set of SMD resistors in that case. I'm using DM9368N chips because I have them. There is also the MC14495P1 driver and it has an integrated resistor array that limits the current to a few mA I think. But I think the MC14495P1 is harder to get hold of an in any case I already have DM9368N.
ID | Name | Designator | Footprint | Quantity |
---|---|---|---|---|
1 | 10k | R4 | HDR-TH_2P-P2.54-V-M | 1 |
2 | 250R | R3 | HDR-TH_2P-P2.54-V-M | 1 |
3 | O | R1,R2 | HDR-TH_2P-P2.54-V-M | 2 |
4 | 100nf | C2 | HDR-TH_2P-P2.54-V-M | 1 |
5 | 100uf | C1 | HDR-TH_2P-P2.54-V-M | 1 |
6 | Header_8x1 | H1,H2 | 210S-8X1/2.54 | 2 |
7 | DM9368N | U1,U2 | DIP16 | 2 |
8 | 0.56 Seven Segment CC | LED1,LED2 | 0.56 SEVEN SEGMENT CC | 2 |
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