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You datasheey the visitor n. Fare click qui per la versione Italiana. Best view with x This board, in fact, allows the PIC to be interfaced with external circuits in a reliable and versatile way, making it possible to blame just the external circuits in case of electrical problems, and, of course, to concentrate just on the software.

PIC 16F16F This board have been designed for PIC16F and tested with it and on this page we’ll always refer to it ; the circuit should be anyway suitable for mentioned microcontrollers, too 18F4x2 and 18F4x8 74hd541n, with the following notes: As previously said, this circuit is not a PIC programmer, datawheet it can be easily interfaced with one of the many programmers you can find, allowing you not to remove the microcontroller from the board in-system programming.

Compared to the version 1. When you click on a link of an image i. While designing this circuit I tried to realize a versatile circuit and, in the same time, I also pursued the possibility to mount only the components one datasjeet, making this D. It is of course possible to mount later a part or all the components not soldered at first. The version here described is the 1. If you wish to realize the Development Board after reading, in particular, the “Acknowledgement and disclaimers” sectiondatashert can find here the links to save the images you need at dpireachable anyway in other points of this page.

Advices for printing in the layout printing section further. Copper side layout at dpi KB Components side layout at dpi KB Components placement silkscreen at dpi KB Electrical schematic at dpi KB Components placement and track dtasheet at dpi KBor, still good quality, Components placement and track view at dpi KB. I have choosen to use a datssheet for each pin that sometimes has to be insulated or connected to other particular 74h541n i.

In any case, during the normal switch between use and programming, as an example when the software is being developed, to allow the chip to be programmed it is usually enough to carry out a few simple operations, not more than a few seconds, setting to OFF some switches of a few dip switches and those of another dip-switch to ON others dip-switches can be left as they are.

74HCN_PDF Datasheet Download IC-ON-LINE

As soon as the chip is programmed, it is enough to carry out the inverse operation so having the PIC ready again and connected to the external world. In the section “Programming” operations to carry datashheet are reported in details for the various kinds of programmers, their supply and the LVP bit of the PIC.

This project is entirely personal; an acknowledgement goes to the software allowing me to realize the circuit’s layout. Dztasheet is the program PCB Elegance v.

74HC/HCT541 Octal Buffer/line Driver; 3-state

Microchip and PIC are registered trademarks. Although it’s theoretically possible to use other forms of supply, this Development Board v.

There is anyway a mA fuse; see warnings about the fuse on the components’ list. Being this material at free disposal datxsheet whoever desires it, it is absolutely forbidden any form of 74hc54n for commercial purposes. It is also forbidden any change to the circuit if not for didactic or purely personal purposes; if this is the case, they must not take anyway to any form of direct or indirect profit.

If, in whichever way, xatasheet wish to divulge such changes, it is compulsory to ask a written permit to the author of this article also by e-mail. The circuit’s layout and all the informations contained in this page are supplied “as they are”, without any form of warranty.

I don’t assume of course datassheet direct or indirect responsibility for direct or indirect damages to things or person coming from informations got from this article. Suggestions of any kind to allow me to improve the circuit are well accepted. References to a particular switch of the dip-switch Sx will be made as Sx-n, the same convention for connectors JPx. The “E” suffix simply means “extra”.


A reference to the switch Sx-1 points out the first switch of the dip. Another example in the figure 4 at dpi – Components placement and tracks layout; the dpi version, printable with good quality, can be reached at the section layoutbut it requires to be loaded a longer time than the dpi version, apt daasheet have a look at it. JPE8 respectively, as homologous elements of the two sets are connected together pin by pin.

If you want, before reading now the description of the various characteristics of datashet circuit, to have an idea of what this board can allow you to do you could take a look at something practical, that is how to set switches for normal operations.

Beside, also the voltage fed to the determines the value of the fuse, as the fuse itself must avoid an excessive 74hc514n dissipation in the see warnings about the fuse on the components list.

There is also a diode protecting the circuit 74hv541n a reverse polarity applied to the but it is not a protection for the others sources: Some applications Concerning possible applications, this board allows you to have a surely working base circuit and to interface it easily, so allowing you to focus just on the program and on the crcuit being developed. If you want, instead of reading now the 74hc5541n of the many 774hc541n and dip.

As previously said, the choosen working mode is selected by mean of dip-switches see again figure 4 – Components placement and tracks layout. Let’s now describe the function of the several switches.

S1 – Control of power supply and reset Supply. To reser the microcontroller a Reset switch S4 is available, and sometimes better. Such facility should be anyway not necessary, as the PIC has an internal circuit with the same function. The PIC starts working.

Depending on the program, it can be useful or necessary to reset the PIC by S4. S5 – Connection to programmers It is a 6-ways dip switch related to the programming. Take a great care when connecting the supply pins from or to the programmer. The function of S3 is described further. S2 – Clock It’s the switch controlling the clock source. Datasheet remark that, in the case of the crystal, the waveform on the Osc1 and Osc2 pin is a sine wave or a distorted sine wave.


Datasheeets & Application Notes

Through S and S the Osc1 and Osc2 pins are connected to the connector JP1, allowing to carry those signals to an external circuit or to receive datasheeet from it.

The potentiometer allow you to tune the frequency on a wide range. The minimum value in the RC net is the value adtasheet R4. Of course, only one clock source must be selected. See details in the section “Programming”. It is a good practice, if not really necessary, after programming, that is during the normal working, to insulate the PIC from the programmer opening all the switches of S5.

As already said, take care to avoid any conflict among supply sources. We will now describe hot to set up the switches in the different working modes. At a first sight it could seem difficult, but you can soon realize it is a very simple procedure, in the same time allowing you a versatile use of the board. You can find a bit further some images describing how to set up the switches in the most usual working modes. Starting with all switches OFFit is necessary to distinguish between LVP enabled or disabled, a distinction appliable, during the normal working of the PIC, for all supply, clock etc.

Set, in the following order see also figure E If the port should be uses as an input, such current should be supplied by the circuit connected to RB3, and this could change the signal level.

In this way, during normal working, RB3 is tied to ground through a pull-down and the PIC cannot enter the programming mode, while this could happen f you 74hc514n RB3 floating.

After the description on hot to set the switches concerning the LVP, we now describe how to set up the switches for the normal working. Here some examples on how to setup dip switches.

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74HCN 데이터시트(PDF) – NXP Semiconductors

In order to program the PIC without removing it dtaasheet the Development Board, it is necessary to connect to JP9 the proper signals and voltages from the programmer. According to it, the proper configuration of switches must be choosen. In any case, be always aware of what you are doing!

Take a great care to avoid conflicts among the different supply sources, and keep in mind that also datadheet together two common or “ground”, or “earth” terminals of two different power sulpplies can seriously damage your circuits!

As an instance, if you supply the PIC and the programmer with two different power supplies, the necessary connection between the two “common” terminals could be very dangerous for your circuit! When you are in doubt, and you should use two different power supplies, it is better to replace one of them with a battery, because it is floating and takes the same reference of the circuit it is connected to. For programming, see further. If LVP of your PIC is on, as an example when the chip is just come out of the factory, catasheet order to have it working without any problem you should follow the instruction in the section ” normal operations “.

Set in the following order:. When programming is complete, set in the following order: JPE15 can be a 2 pins connector, with a 5. All other connectors have a 2. The distance between jumpers’ pins is 7. I have not any problem with the clock generated by the crystal, up to 20 MHz, therefore I don’t use RE6. Should you need it, you must cut the track to be able to use the needed holes RE6 can be a resistor, a trimmer, etc.

If you know hot to do, you could also calculate the characteristics of a heat-sink to be mounted on the Components are quite standard, you should be able to find them in any electronics store. If you haven’t saved them yet, through the links in the beginning of this page, you can datasheeet it now. The images you can see below here are or dpi images. You can save just from this page datasheet dpi images on your hard disk or other media choosing “Save OBJECT with name” and print them later with your browser or daatasheet programs.

With the browser you could have problems with the images’ size, while, as an instance, Windows TM Imaging TM should print them in true size.

If you are in doubt with regard to the size of the image you have printed, and you are in fear that it is not in true size, you can just measure the distance between holes for DIL components, which must be 2. Of course, 74hc5411n to make coarse mistakes, you could take as an example the eatasheet between the first and the ninth pin, looking if it is 2.

You will not be able, of course, to measure hundredths of millimeters, and maybe not even tenths of millimeters datasheft would not be anyway very meaningful, given the size of pads and holesbut if your measure is a little bit more than 20 mm your printing should be good. To check the horizontal scale, you could satasheet as an example the distance between the two holes of a resistor; it must be mils, that is 2. If any of the two distances is not the one you are expecting, naming x that measure, you should apply a horizontal zoom factor of In the figure n.

You can see there that the bottom side layout soldering sidewhen exposing the board to the light for the photoetching, must be placed with the printed side in contact with copper.

The images below are at low resolution, to save download time, but, as said, links allow access to higher resolution images. Here the printable dpi image. Here the enlarged dpi schematic.