| ??? 04/12/05 22:47 Read: times |
#91476 - Further Clarification of My Project Responding to: ???'s previous message |
Thanks for the replies, guys. I should have been more descriptive in my post. I will attempt to clear up any vagueness; please excuse any erroneous assumptions as I am still a student and learning.
I was planning on using six of the 74LS373 octal latches to multiplex the six displays. P0 of the 8051 is used a a data bus, with the 8 output pins connected in parallel to each of the 373s inputs. By using the enable of the 373, I could then multiplex the displays by only turning on the appropriate 373 when I needed to change that digit. Otherwise, it would contniue to display the same info, which is perfect for what I wanted to do. I then was planning on driving the displays somehow from the 373s, which as Jan correctly pointed out is impossible as the 373 cannot source or sink sufficient current. I was hoping some array of transistors might give me the output desired. Should I abandon this plan and instead pursue use of the MAX7219? I notice on Maxim's web site they even list an application for driving higher power loads. (http://www.maxim-ic.com/appnotes....mber/1196) However, they note that this works for common anode displays only. Could I simply use a PNP transistor to accomplish the same thing? I appreciate any help! PS: Jan special thanks to you, the guy who lives in the town where my VW R32 was born! |
| Topic | Author | Date |
| Seven Segment Displays Driven By 8051 | 01/01/70 00:00 | |
| Maxim part | 01/01/70 00:00 | |
| Integrated MUX drivers are 5V only | 01/01/70 00:00 | |
| Confused | 01/01/70 00:00 | |
| Multiplexing 7-segment LED displays | 01/01/70 00:00 | |
| rate of multiplex | 01/01/70 00:00 | |
| Yes, of course, | 01/01/70 00:00 | |
| Further Clarification of My Project | 01/01/70 00:00 | |
| nobody can answer that | 01/01/70 00:00 | |
| No 373s! | 01/01/70 00:00 | |
| Ohhh! Pretty NM | 01/01/70 00:00 | |
| OK | 01/01/70 00:00 | |
| MAX7219 | 01/01/70 00:00 | |
| Like this | 01/01/70 00:00 | |
| current? | 01/01/70 00:00 | |
| LSD23255-10 Display Specs | 01/01/70 00:00 | |
| data sheet? | 01/01/70 00:00 | |
| GOOGLE!!! | 01/01/70 00:00 | |
| Multiplexing | 01/01/70 00:00 | |
| Drivers | 01/01/70 00:00 | |
| 74hc595 alt. | 01/01/70 00:00 | |
| TPIC6C595 by TI? | 01/01/70 00:00 | |
Thanks. | 01/01/70 00:00 |



