CD4543 DATASHEET PDF

Product data sheet. Rev. 7 — 1 April 2 of Nexperia. HEFB. BCD to 7-segment latch/decoder/driver. 4. Functional diagram. Fig 1. CD CMOS Bcd-to-seven-segment Latch/decoder/driver FOR Liquid-crystal Displays Data sheet acquired from Harris Semiconductor SCHSD – Revised. Page 1. Data sheet acquired from Harris Semiconductor. SCHS CD Page 2. Page 3.

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It’s fun to look back at old Apple emails. MailFromCupertino It’s fun to look back at old Apple emails. I can’t believe how cheap they are. Similar to some of my previous clocks, I’m going to need three sections: The minutes and seconds sections will be identical. The hours section will be a little different. Since the hours section is the trickiest, I decided to start with that.

I laid out a schematic, borrowing some elements from my nixie clock. I’ll be using shift registers. Each shift register can address two displays. Per the CD datasheet, you need to datasheeet a square wave to the phase pin.

I popped my Bare Bones Arduino onto my breadboard top right and loaded the blink sketch. Instead of the default ms delay between blinks, I changed it to 16ms.

That results in a 60Hz square wave. I datashewt like a charm. The display looks perfect! I think this just might do the trick!

I went ahead and modified the code some more to display two digits. I did consider using the decimal points on the LCDs as the colon separators. I was going to just flip the digit on the left upside down and hope that the two decimals points would look like a colon. However, they are too far apart and look sort of silly. So I can scratch that idea. Unfortunately, the CD only has outputs for the segments, datashet the decimal. LCDs need to have an alternating signal between the segment and the common pin.

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CD4543 DATASHEET EBOOK DOWNLOAD

Since there is a 60Hz square wave on the phase input of the CD, I took that signal and passed it into a hex inverter. I then took the output of the inverter and connected it to the decimal pin. Since the output of datashest inverter will be out-of-phase from the signal on the common pin, the decimal will turn on.

One is enough to do all three sections of the clock, but I need to make each section modular. I’m not about to put a on each PCB. That would be a waste of 5 inverters. Luckily, they make single inverters. You can get a SMD package for only. So I guess I’ll just use decimals to separate the hours, minutes, and sections. It’s not very “clock like”, but it’ll have to do. They’ll always be on, so I don’t need any logic in there to turn them on and off.

I then got to thinking about how I was going to implement the PM indicator.

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All I need to do is flip the one digit upside down, but how do I turn the decimal on and off? Since the decimal is connected to the output of an inverter, how do I stop the signal? It’s the same “phase” signal that’s going everywhere within the circuit.

I suppose I could give it a dedicated signal, but I don’t want to have multiple signals running all over the place.

Even with a dedicated signal, there is still the matter of stopping it. Not to mention, straight-up DC on a segment could potentially damage the display. Why don’t I just shut off the inverter? Instead of connecting the Vcc pin on the inverter to Vcc, why don’t I connect that to a digital output on the Arduino? This way I can turn the inverter on and off at will.

When it’s on, an out-of-phase signal will flow, and when it’s off, there will be nothing on the pin. Not high, not low.

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Hours, decimal separator, and a PM indicator. There are some more hardware considerations to be made; like settings buttons, etc. First I need to put together a PCB so I can better visualize what everything is going to look like, how big it’s going to be, and what kind of enclosure I will need.

This will dictate what kind of buttons I’ll use and where they’ll go. Since OSH Park gives you three boards with every order, I want to design the clock sections in a way that the one PCB will work for the hours, the minutes, and the seconds; just like I did with my Large 7-Segment Clock. The footprint is perfect, but that’s going to be one huge PCB.

Not to mention it’s mostly dead space. It’ll probably cost a fortune. I uploaded it to OSH Park just to get a price. Back datashfet the drawing board.

I could just make a driver board and glue it to the back, then just solder wires directly to the pins. I want to be able to do something similar to my Large 7-Segment Clock in the sense that I will 3D print some kind of frame that the three sections will mount onto.

I decided to make separate PCBs for the top pins, the bottom pins, and the driver board. I will then connect the pin boards to the driver board with ribbon cables. With that decided, I went ahead and finalized the display driver.

3″ LCD Clock – Part I | Kevin – Main

Even better, all three PCBs combined will cost less that half of one huge board. I placed my order with OSH Park for all three boards. See datashee project from start to finish: