I am looking for an 8-bit Serial-In, Parallel-Out shift register that is tolerant of more than 12V for an automotive application. The functional equivalent of a 74164 would be ideal. The CD4015 comes close, but I would like a part with an active-low reset. Does such a part exist and is it readily available?
You don't run circuits directly on automotive "+12V", you regulate and surge protect. ...Jim Thompson
[On the Road, in New York]
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I love to cook with wine. Sometimes I even put it in the food.
I still generally wouldn't use a 12V part. Cold crank can give you 6-8V, in Michigan 4V ;-) If you need circuits to run during crank, like your ignition, you have to be clever ;-)
I'm playing professor over an automotive transmission controller design right now... 3.3V supply... 1.8V logic. ...Jim Thompson
[On the Road, in New York]
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
That's cool, or the 'HC595 or the TPIC6b595, but they're all 5v devices.
He almost might as well use an 'HC164--he's going to need load-dump stuff anyhow, as Jim pointed out. The load-dump protection could just as easily regulate too.
Thanks Jim, and everyone else. Because this circuit must occupy a small space, I was trying to minimize the number of parts, including a regulator and other "glue" to invert logic. I have already included in the design suppression of power supply transients, but I just wanted to minimize the number of necessary parts.
Sure. Eg. PIC16F610, or even a PIC16HV610 which includes a built-in 5V shunt regulator.
Best regards, Spehro Pefhany
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"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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Failure does not prove something is impossible, failure simply
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Is there a version of PIC that could be programmed "in-circuit," as it were, where you don't need to plunk down a hundred bucks for a development system, but just energize the chip and send it a data stream, rather than heroics like special programming voltages and stuff?
Generate the light locally as well, and pipe fiber 'light pipes' to the signaling areas. Instead of switching power, you are then switching banks of lighting arrays on a local board. The brightness should still exceed that of the old incandescents.
At that point,one could even generate full color imagery in the end "display device".
This is how IBM made the first high resolution OLED display (production level). The OLEDs were on chips, and each pixel of the display was lit via individual 100% addressed fiber. Eleven million of them, in fact. Far different from the "OLED" display technology we are currently seeing.
Anyway... ten years from now, they will do what I have said here on the car tail lights, etc.
The hardware interface are 5-pins: Reset - RESET of chip
+5V Gnd PGC - program clock PGD - program data
The main software package is MPLAB, and its FREE :
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I would suggest an archive version v8.73a :
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The software comes with the assembler for all of the PIC processors. A C compiler will cost a few more bucks. There are lots to chose from, some are even free:
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Bottom line is, get started and you will find out how easy it is. Then you will better understand when someone says "use a PIC".
They plug into the USB port and don't require any other supply.
There's free versions for all PICs, I think, which are unlimited but produce more bloated code (less optimization).. so you might have to buy a bigger chip (usually a dime or two more to double the memory, so no big deal until you're using hundreds or thousands).
You can get similar products for ARM micros (32-bit) but the learning curve is a bit steeper and there are no breadboard-friendly DIP packages available, so you're into "heroics" (or making a PCB) to get wires to the thing.
Best regards, Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Few programmable components require special programming voltages, anymore. One I'm using now can't be programmed with the VCC less than 4V (it operates from
3.3V to 5V) and another requires an external 4.7uF cap to program in-situ, and some require an enable pin but most take no special treatment at all. The days of "programming voltages" are pretty much gone.
As far as the cost of the "development system", they're often free from the disties. They're always trying to push ARM stuff on me. ;-)
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