DIY PICmicro K149 Manuale utente

K149

USB

PICmicro®

Programmer

DIY Electronics (HK) Ltd

PO Box 88458,

Sham Shui Po,

Hong Kong

http://www.kitsrus.com

mailto: [email protected]

Last Modified March 3 2003

Board Construction

The board is quite easy to construct and it is advisable to read through these

notes before starting. The USB chip is quite tiny and should be mounted on the

underside of the PCB ready for use.

WARNING

Be aware that the premounted USB chip is sensitive to static electricity discharge

and could be damaged by mishandling of the PCB. Be careful with the board and

avoid touching any of the tracks or pads while assembling it. Try to handle it only

by the edges.

Other chips in this kit are also sensitive to static discharge. These are the

PIC16F628 and ICL232 chips. Do not touch the pins and only handle them by

their ends. It is advisable to use sockets for these two chips.

Starting

The first thing to do is inspect the PCB for shorted or open tracks or other

damage. Be aware of the static warning when doing this check. When you are

satisfied that all is well, then you can proceed.

Start with the flattest parts first, which are the resistors. Hold each resistor body

by the thumb and forefinger and use your other hand to loosely bend both of the

leads over at right angles at the same time. Try not to make the bends too sharp,

and you will find that they slide straight into the mounting holes on the board.

Leave the pigtails on each of the components until after soldering as the extra

lead length serves as a heat sink for the component. Try not to leave the

soldering iron on the components too long or you risk damaging them. The usual

method is to hold the iron tip so that it touches the component lead and the PCB

pad at the same time, and then apply a small dab of solder. This operation

should only take about a second or two. If you are unsure of your soldering

ability, find some spare components and practice on these before building the

programmer board.

Check that each solder joint is bright and shiny and doesn't look like a big dull

blob which could mean a dry solder joint. The solder should flow freely onto the

component lead and solder pad if it is to be a good joint.

After the resistors are soldered in, recheck your work and then mount the diodes

D1, D2 and D3

There are 4 LEDs that can be mounted next. Make sure they

are oriented correctly. The Anode is marked on the PCB and

is the longer of the two leads on the component. The

Cathode has a flat surface on the LED body and is also

marked on the board.

Next, if supplied, mount the IC socket for the PIC16F628 chip.

Now you can mount the box poly (MKT) capacitors. Most of these look the same,

so check the values and make sure they are inserted into the correct positions.

Then solder the four 22p ceramic capacitors.

Next, mount all the electrolytic capacitors. These are polarity sensitive

components so make sure they are mounted properly. The positive lead is longer

than the negative lead, and the negative lead is also marked on the side of the

capacitor. On the PCB overlay, there are holes marked [+] as the positive lead

for each of these components.

There are five transistors supplied. Four of them are PNP type BC558, and one

is an NPN BC547. Do not mix them up and mount them as shown on the PCB

overlay.

Now solder the 9 pin RS232 socket, the USB socket and the power jack on to

the board followed by the 7805 and 78L08 regulators, again carefully checking

orientation.

The next parts to mount are the 2 crystals. One is a 4MHz type and the other is a

6MHz so don't get them mixed up.

You can now mount the DPDT switch and the ZIF socket.

There is 1 wire link that needs to be fitted to the board.DO NOT insert it at this

stage.

The last things to fit to the board are the rubber feet. These stick to the

underside of the PCB, one in each corner.

Now you should go over all of your work and inspect for dry or unsoldered joints

and check all components for correct orientation and placement.

If you are satisfied that all is well, then you will need an 18VDC power supply to

test the board. Positive should be on the inner connection of the power jack as

shown on the PCB overlay.

Connect the power and observe that

the power LED (L4) lights. If not,

turn off the power immediately and

check the orientation of diode D2 nd

the power wiring. Re-check the PCB

for any other mistakes.

Turn the power back off if the LED

did light up. Make sure you have a

multimeter ready for use and set it to

measure 5 volts DC. Turn the PCB

back on and measure the voltage

between a test pads marked on the

PCB (+5V) and (Gnd) near the

RS232 socket.

The meter should read close to 5 volts. If not, turn off the power immediately and

check that the regulators are inserted properly.

Go over the PCB again and check thoroughly for incorrectly placed components,

shorts or open circuit joints.

If all is well, turn off the power again.

Next, mount the 7406 hex open collector inverter, U4, and the ICL232 chip, U3,

taking care of chip orientation as it is very hard to remove these chips once

soldered. Remember about chip handling and static.

Now comes the time to insert the wire link LK1 near the

power jack. This can be a discarded pigtail from a

resistor or capacitor. This link completes the power

connection to the USB chip and its circuitry.

Now insert the PIC16F628 into its socket. Pin 1 is towards the power jack.

Image of the finished PCB.

Connect a serial cable between the board and your PC. This cable is a straight

through type, NOT a null modem cable. In other words, pin 1 at one end

connects to pin 1 at the other end, pin 2 to pin 2 etc.

Make sure the switch is operated towards the [SERIAL] side.

Run the programmer software for the kit. MicroPro.exe

Click [File] -> Port or double click the COM x label on screen to bring up

the COM port window. Select the COM port that you will use for serial

communications, then [OK].

Re-check the power and PC connections and turn on the programmer board.

You should see Board connected appear on screen. If not, check your cable,

the PC port setting and also that the switch is set properly.

If all is well, then as a simple system test, select 16F84 from the chip select

menu and click on Read. You should see some LEDs light and the programmer

will read from a non existant chip. The screen will most likely fill with0000's.

Now you can turn off the PCB and prepare it for the USB test.

First off, disconnect the serial cable and move all of the switch to the [USB] side.

To enable USB capability for your PC and this project you will need to install a

special driver. This is a piece of software that handles the communications

between the PC and the special USB chip on the programmer PCB.

Create a USB driver sub directory into the directory where your programmer

software was installed. C:\diyk149 was the default. Therefore you would have

a new directory calledC:\diyk149\usb.

The drivers come in 2 flavours, plug and play support and no plug and play

support. As this programmer does not have plug and play support, that narrows it

down to 1 choice.

You will need to visit this web page and download this driver.

VCP drivers for Win 98/2000/ME/XP (without PNP support)

http://www.ftdichip.com/FTDriver.htm

Download and unzip the file into the newly created USB directory.

Now visit this other web page and download the PDF application note that

describes how to install the driver for your particular system.

http://www.ftdichip.com/FTApp.htm

For example you would download...

AN232-03 for Win 98

AN232-05 for Win2000

Download the PDF file into the USB driver directory listed above.

Open and follow the simple directions given in the PDF file. This should only take

a few minutes to do.

When the driver installation is completed, connect a USB cable from the PC to

the programmer board.

Make sure MicroPro.exe is not running on the PC.

Turn the board on. Nothing will appear to happen at this stage although you may

get a message from Windows saying that it has found new hardware..

Now run MicroPro.exe.

Click [File] -> Port or double click the COM x label on screen to bring up

the COM port window. Select the COM port that you selected for use for USB

communications while installing the driver, thenOK.

The PC may take a short while to establish communications with the USB port.

When it has done so, the COM port number will appear on screen and the

programmer is ready for use on the USB port.

If all is well, then again as a simple system test, select 16F84 from the chip

select menu and click on Read. You should see some LEDs light and the

programmer will read from a non existant chip. The screen will most likely fill with

0000's.

Your new programmer is now ready for use.

When using the USB interface, always turn the

programmer on before starting MicroPro.exe.

When finished with the programmer, close MicroPro.exe

then turn off the board.

Failure to use this power up sequence may result in a stalled PC because of the

non responding USB port.

In Circuit Serial Programming

This programmer is capable of doing In Circuit Serial Programming (ICSP).

ICSP allows you to program a PICmicro® that is already plugged into it’s target

circuit. That is, the chip does not need to be in the programmer socket to

program it.

The circuits on the following page give some ICSP connection examples.

ICSP programming needs to have control of two PIC pins which are used for

Clock and Data. These are usually PORTB pins RB6 and RB7. It also needs to

control the MCLR pin and the VCC pin(s). A common ground connection must

also be made.

In some cases the ICSP programmer cannot reliably control the programming

pins on the PIC because of any connections to these pins that form part of your

circuit. Voltage rise times can be critical for programming and if your circuit draws

too much current, or has a high capacitive load then ICSP may not work.

If your target circuit draws more than around 60mA, or your circuit is not suitable

for an external 5 volt supply. then your circuit will need to supply the 5 volt power.

In this case leave the VccP wire disconnected. Some PIC chips need to have the

5 volt rail specifically controlled, and will not be able to be programmed with the

VccP wire disconnected. The 16F675 is one example.

Not all circuits will accept ICSP programming, so if you cannot get the chip to

program properly using this mode, then the only options are to totally isolate the

PIC on the target board, or just use the programming socket.

Be aware that incorrect connections between your circuit and the ICSP

connector may cause damage to both your circuit and the programmer.

Please note that LVP programming is not supported.

ICSP PROGRAMMING EXAMPLES

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