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As soon as the chip is programmed, it is enough to carry out the inverse operation so darasheet the PIC ready again and connected to the external world.

Set, in the following order see also figure E2: Of course, not to make coarse mistakes, you could take as an example the distance between the first and the ninth pin, looking if it is 2. PIC 16F16F The fuse should stop the input voltage to the when the current sunk is higher than the nominal value of the fuse; the fuse should protect the external power supply in input to thebut has no effect on the supply connected through JP8 or JP9; besides, in case of short-circuit, it is not sure at all that it is able to avoid damages to the chip, the programmer, possible external circuits and to the power supply itself, whichever connector J1, JP8 or JP9 this one is connected to S7 inserts the LED D3, which shows the presence of supply to the PIC, whereever it comes from from thethrough S1, from JP9 through S5 or from JP8 through S6 The LED D4 shows the presence of a voltage between the pins 1 and 2 of the connector JP8; when S and S are closed, that supply is the one feeding also the PIC from thethrough S1, or from the programmer, through JP9 and S5, or from JP8.

Remark on how to identify switches and connectors’ pins References to a particular switch of the dip-switch Sx will be made as Sx-n, the same convention for connectors JPx.

It is the program PCB Elegance v. If you know hot to do, you could also calculate the characteristics of a heat-sink to be mounted on the You can find a bit further some images describing how to set up the switches in the most usual working modes. 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!

The distance between jumpers’ pins is 7. Compared to the version 1. 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. Here the printable dpi image. 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.

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Of course, if you own an 8 trace oscilloscope, you can do without it. 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 haven’t saved them yet, through the links in the beginning of this page, you can do it now.

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. Although it’s theoretically possible to use other forms of supply, this Development Board v. Here some examples on how to setup dip switches. Let’s now describe the main characteristics of this circuit: The circuit’s layout and all the informations contained in this page are supplied “as they are”, without any form of warranty.

Circuit’s characteristics and description Let’s now go on with the possibilities of this Development Board.

If you wish to realize the Development Board after reading, in particular, the “Acknowledgement and disclaimers” sectionyou can find here the links to save the images you need at dpireachable anyway in other points of this page. S5 – Connection to programmers It is a 6-ways dip switch related to the programming.

74HCN – Nexperia – PCB Footprint & Symbol Download

References to a particular switch of the dip-switch Sx will be made as Sx-n, the same convention for connectors JPx. Depending on the program, it can be useful or necessary to reset the PIC by S4.

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. To reser the microcontroller a Reset switch S4 is available, and sometimes better.

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

The images you can see below here are or dpi images. In any case, be always aware of what you are doing!

The version here described is the 1. The images below are at low resolution, to save download time, but, as said, links allow access to higher resolution images. If, in whichever way, you wish to divulge such changes, it is compulsory to ask a written permit to datasheeet author of this article also by e-mail.

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74HC541 Datasheet PDF

In the section “Programming” operations to carry on are reported in details for the various kinds of programmers, their supply and the LVP bit of the PIC. 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. Functions of connectors and dip-switches If you want, instead of reading now the descriptions of the many connectors and dip. In order to program the PIC without removing it from the Development Board, it is necessary to connect to JP9 the proper signals and voltages from the programmer.

Hoping I have been useful to you, just to me to wish you a good work! All other connectors have a 2. The minimum value in the RC net is the value of R4. Back to Home Page E-mail address Similar topics on this site: If you wish, just send me your opinion even in an anonymous form.

Best view with x Fare click qui per la versione Italiana. Your country I think this circuit is Useful A little useful Unuseful.

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. 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 them from it. I don’t assume of course any direct or indirect responsibility for direct or indirect damages to things or person coming from informations got from this article.

Take a great care when connecting the supply pins 74gc541n or to the programmer.

As previously said, this circuit is not a PIC programmer, but 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. I have not any problem with the clock generated by the crystal, up to 20 MHz, therefore I don’t use RE6. 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 view at dpi KBor, still good quality, Components placement and track view at dpi KB.