Citation neededMrAl wrote:Hi,
Wow, 1000 piece pricing is up around 12 dollars US each.
Help With Spec Sheet: MM74C926
Re: Help With Spec Sheet: MM74C926
Re: Help With Spec Sheet: MM74C926
Okay. But why the red ink?...EPA III wrote:I said "rotary". I meant thumwheel switch. About $5 and it is the only component you need. Seems to make sense to me.
Re: Help With Spec Sheet: MM74C926
Feed the serial data to an SR and latch the parallelEPA III wrote:OK, you come out serial and then what?
data into the LEDs. Simple, really.
No.EPA III wrote:Do you know of some real cheap LED display (four digit at least and nice BIG numbers like 1/2 inch) that incorporated serial input?
Unless the LED display is small, requiring only 20mA or lessEPA III wrote:Am I missing something? If a $3-4 uC will be dedicated to this task, what's the harm in dedicating six outs to doing the display?
per segment, the uC will require a buffer (driver) stage.
I have driven dual seven segment displays in the 10mm
size directly from the uC port. For larger displays or
multi-digit ones the driver must pump more current,
so the SR with internal power drivers wins, and frees up
a bunch of uC IO pins.
TPIC6C595 Datasheet hereEPA III wrote:Do you have any part numbers for "octal power logic SRs"?
Looking forward to seeing one.EPA III wrote:...bigglez wrote:I'd need a schematic or at least a block diagram to get
my head around that idea.
Re: Help With Spec Sheet: MM74C926
Bigglez wrote:Okay. But why the red ink?...EPA III wrote:I said "rotary". I meant thumwheel switch. About $5 and it is the only component you need. Seems to make sense to me.
Quotes within quotes within quotes. I thought the red color would make it easier to read: easier to tell what I was saying in the latest reply. Not an attempt at shouting.
Paul A.
Paul A.
Re: Help With Spec Sheet: MM74C926
I will post a block diagram as soon as I put it to CAD.Bigglez wrote:Feed the serial data to an SR and latch the parallelEPA III wrote:OK, you come out serial and then what?
data into the LEDs. Simple, really.
So the serial data would be in seven segment code at the uc output?
No.EPA III wrote:Do you know of some real cheap LED display (four digit at least and nice BIG numbers like 1/2 inch) that incorporated serial input?
Hence the SR chip.
Unless the LED display is small, requiring only 20mA or lessEPA III wrote:Am I missing something? If a $3-4 uC will be dedicated to this task, what's the harm in dedicating six outs to doing the display?
per segment, the uC will require a buffer (driver) stage.
I have driven dual seven segment displays in the 10mm
size directly from the uC port. For larger displays or
multi-digit ones the driver must pump more current,
so the SR with internal power drivers wins, and frees up
a bunch of uC IO pins.
That's what I thought. Even at 20 mA per segment, you can exceed the total current/power spec on an uC. 7 segments X 20 mA = 140 mA and then there's the decimal point. At least 150 mA.
In this device, I don't have any use for the "freeded up" pins. At least, not yet.
TPIC6C595 Datasheet hereEPA III wrote:Do you have any part numbers for "octal power logic SRs"?
Thanks, I am studying it.
Looking forward to seeing one.EPA III wrote:...bigglez wrote:I'd need a schematic or at least a block diagram to get
my head around that idea.
Paul A.
Paul A.
Re: Help With Spec Sheet: MM74C926
How about editing the material for brevity?EPA III wrote: Quotes within quotes within quotes. I thought the red color would make it easier to read: easier to tell what I was saying in the latest reply. Not an attempt at shouting.
Or, interleaving the quotes with their responses?
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