Pickit2 vdd voltage level error

[SOLVED] Problem with my DIY Pickit2

Plateau

Junior Member level 3

Hello, folks, are you all ok?

I’m facing a problem with my DIY Pickit 2 clone made by me. I’ve followed the steps from these references:

. and I’ve made some changes in layout (I put the most part of resistor in vertical position and added an external power supply for debugging).

After solving some problems with the bootloader, now the problem is about VDD voltage level. When I connect the USB cable on the board, the Pickit2 is recognized by PC but the Pickit2 Software 2.61v always shows me this message: Pickit2 VDD voltage level error. Check target and retry operation.

If I plug the external power supply on, the VDD voltage level error stops and the Pickit2 works perfectly.

Well, I wouldn’t like to use the external power supply all the time.

Could anybody help me?

Plateau

Junior Member level 3

Hello, lijoppans, how are you?

The modified schematics are in my first post. My PCB was created by modifying this Reference for using «normal» electronic parts (not SMD).

Well. I’ll take a look on the reference gave by you.

Thanks in advance,

wp100

Advanced Member level 5

Looks like you have built a very close copy of the full Pk2, whereas most diy versions are a lot simpler without the eeproms etc.

You say the Pk2 works fine on an external psu , but you do not say what is connected to the Pk2, just a chip to be programmed or to a full circuit board ?

As I am sure you know, you must have the correct circuitry on your board if its to be used for ICSP.

Also assume you are using Pk2 V2.61 program rather than direct from MPlab.

Have you gone into the Tools, Troubleshooting section and run those tests ?

I would first get the Pk2 working using V2.61 with just a Pic chip connected directly to it with no external circuitry or psu and get that sorted out properly.

To me it sounds like you have a fault in either the pk2 +5v rails or something on your external board, which just using a pic chip shoulsd soon eliminate.

jayanth.devarayanadurga

Banned

Can you please zip and post your eagle .sch and .brd files?

wp100

Advanced Member level 5

Please show me the modified schematics. 2.

I made a Pickit2 clone. It can’t program 3.3V devices

Yes you can, I made a pk2 with a fixed 5v rail like yours.

You can do it two ways.

1. Apply 3v3 to the target chip /circuit before you power on the PK2, with the circuit like yours it will sense the 3v3 on the chip and turn off the +5v.
( just make sure Pk2 Vdd target is switched off)

2. The safer way I prefer, is to fit a 3v3 regulator on the +5v rail where the usb connector comes in so the whole PK2 circuitry is run on 3v3.
( I use the standard pic18F2550, not the LF version, and its programmed 18LF and Pic24 chips at 3v3 without problems.

Plateau

Plateau

Junior Member level 3

Hello, folks, are you al ok?

First of all, merry christmas.

I got mad due to the last problem and so I decided to make another PCB using all the files from the first reference (https://www.circuitvalley.com/2011/. howComment=1356263781754#c1820552152028921641).

My PCB seems ok, but now I’m facing another problem (well. I’m thinking I’m not lucky. haha).

When I plug the USB cable, the board is recognized but when I open the Pickit 2 Software 2.61v it gives me a VPP voltage level error (as you can see below)

**broken link removed**

If I go ahead through Troubleshooting, the first stage goes ok (VDD test, as you can see below).

But in VPP test, the Troubleshooting gives me this error:

In the last test (PGD and PGC) everything goes ok.

Well. I dont know what can I do. I realized a strange fact: if I remove the 47µF capacitor, this error (VPP Short circuit) does not happen, but the VPP voltage is too crazy (sometimes is 13v, sometimes is 2v). The voltage through BAT54 diode is 12.2 volts when I make VPP test. Thus, I think the «DC-DC converter» is ok.

Tomorrow I will try to replace all transistors (2N3904 and 2N3906), except BD140 and I hope this problem can be solved.

If somebody has any idea, feel free for helping me. haha

Thanks in advance, folks.

wp100

Advanced Member level 5

Well. I dont know what can I do. I realized a strange fact: if I remove the 47µF capacitor, this error (VPP Short circuit) does not happen, but the VPP voltage is too crazy (sometimes is 13v, sometimes is 2v). The voltage through BAT54 diode is 12.2 volts when I make VPP test. Thus, I think the «DC-DC converter» is ok.

Tomorrow I will try to replace all transistors (2N3904 and 2N3906), except BD140 and I hope this problem can be solved.

If somebody has any idea, feel free for helping me. haha

Thanks in advance, folks.

Its interesting that you do not have the +5v error on this build, though are your tests done with anything connected to the Pk2 ?

One of the first things the Pk2 software does is check the +5v and +12v lines and gives an error if things are not right.

You may have your transistors the wrong way round, its important you verify the pinout for the ones you bought, they can, but not often, vary in pinout from one manufacturer to another.

The 47uf is an integral part of the charge pump at it will not work without it.

No mention of a BAT54 in that link you show ? — assume its used instead of T2 ?
Have you substituted any other parts ?

If you are getting a proper 12v on your meter during the vpp test then perhaps look at the vpp feedback line r10/r11, thats what the program uses to detect is vpp is ok

Plateau

Plateau

Junior Member level 3

Hiho, wp100, are you ok?

I’ll answer these questions using the quote tool to simplify.

All my tests I’ve done without any device connected to the Pk2.

I realized in this SCH there are 3 transistors placed mirrored on the PCB. Please, take a look in Q4 , Q6 (both 2N3906) and T5 (2N3904). Yesterday, I replaced all of these transistors and I put others removed from electronic scrap. Today I’ve bought a new parts and I’m going to replace them later.

Huuuuum. The mistery is why Pk2 does not detect Short Circuit when I remove this capacitor. Too crazy haha.

I’ve found some BAT46 and BAT54 at home and so, I’ve replaced T2 for security. Furthermore, I replaced a 2N3904 to BC548 (respecting the pinout) and a 2N3906 to BC557 (respecting the pinout). but today later I’ll replace all transistors for new parts.

On the BAT54 cathode there is 12.2v and vpp feedback line there is 4.44v. Maybe this value can be higher than necessary but I think it’s correct.

One more time thank you so much, wp100.

wp100

Advanced Member level 5

Sound like the classic build problem, replacing so many parts you begin to wonder which are good and which are bad.

You can often get a chain reaction where one part damages the next and so on.

Although making a new pcb seems the right way, its often worth using all new parts to eliminate anything suspect.

Using substitute parts you must be sure they are suitable. You are using a 680 or 470uh choke ?

The project you show looks a very thorough presentation so have little reason to doubt that its a good proven design.

However its almost a full copy of the Pk2, and its often said you might find it quicker and cheaper to buy a Pk2 or Pk3 than trying to build your own.

Many PK2 designs shown in the forum are much simpler 4 transistor versions.

Perhaps you might be better trying one of those ?

Below is my diagram which works fine, though I hand wired it, but if you search this forum you will find similar designs with a circuit board layout.
I built it as back for my purchased Microchip Pk2

Attachments

Plateau

Plateau

Junior Member level 3

Sound like the classic build problem, replacing so many parts you begin to wonder which are good and which are bad.

You can often get a chain reaction where one part damages the next and so on.

Although making a new pcb seems the right way, its often worth using all new parts to eliminate anything suspect.

Using substitute parts you must be sure they are suitable. You are using a 680 or 470uh choke ?

The project you show looks a very thorough presentation so have little reason to doubt that its a good proven design.

However its almost a full copy of the Pk2, and its often said you might find it quicker and cheaper to buy a Pk2 or Pk3 than trying to build your own.

Many PK2 designs shown in the forum are much simpler 4 transistor versions.

Perhaps you might be better trying one of those ?

Below is my diagram which works fine, though I hand wired it, but if you search this forum you will find similar designs with a circuit board layout.
I built it as back for my purchased Microchip Pk2

Hiho, wp100, are you ok?

Thank you so much for helping me.

I’m making this Pk2 because here in Brazil it is a little bit expensive and I need to program some 3.3v PICs.

Could you think whether I change all transistors and choke, everything is going to be ok? By the way, at the first moment I’ve used a 1.5mH inductor (the first PCB who only works with external power supply) but I’ve found a 660uH and 1mH at home.

Another strange fact is when I use the 1mH or 1.5mH inductor a little noise is produced by inductor during VPP test but nothing happen with the 660uH inductor.

Источник

Pickit 2 VPP Voltage Level error

nachum

New Member

Hi
I bought a MINI KIT2 for programming. But when I try to program I get a message on the voltage level on VPP is lower than that message «Pickit 2 VPP Voltage Level error. Check target and retry operation.» . Any idea what could be done to resolve the problem.
I checked with a FLUKE the VPP showed me just 1+- volt.

Attached pictures of programmer And the development board kit.

Thank you for your help

Attachments

Wp100

Well-Known Member

Not familiar with that dev board, but it looks like a far east Pickit2 clone.

I would first prove that the Mini Kit2 was working ok by simply putting your 16F chip in a breadboard etc and connecting short 5 wires to the programmer and first see if it can recognise the chip and then program.

The results of that should show what the next step is.

nachum

New Member

blueroomelectronics

Well-Known Member

Wp100

Well-Known Member

You should connect the two —

pin 1 VPP . 1
pin 32 & 11 + Vss . 2
pin 31 & 12 — Gnd . 3
pin 40 Data. 4
pin 39 Clock . 5

kit2 pin 6 not used , see the Microchip Pickit2 Help — User Manual for helpful info and trouble shooting is this does not work.

nachum

New Member

Wp100

Well-Known Member

Just need to establish some facts.

The 16F877, did that come preprogrammed with some sample led flashing progam for the dev board, if so, did it work on the dev board OK ? — Does it still work on the dev board ok ?

Your first attempt to program was with the 16F in the dev board zip socket and the minkkit2 plugged into the dev board ?

The attempt you have just done was in a breadboard with nothing else connected to the 16F and the wires between the two not longer that 150mm / 6″ ?

Do you have any other pic chips to hand ?

be80be

Well-Known Member

nachum

New Member

Attachments

Vizier87

Active Member

You’re sure? That is the problem then, USB output for Vpp to GND is around 5V. Check that from the USB output of your PC (it is USB connected ain’t it?) according to this:
**broken link removed**

Figure out the problem from that point, USB ain’t gonna be the problem, probably some short-circuit problems you overlooked.

nachum

New Member

Attachments

Wp100

Well-Known Member

If your last Vpp test was done with nothing connected to your Mini Kit2, and the Vdd looks ok, then it would seem you have a faulty unit and it needs returning to your supplier.
Is it a far east mail order unit ?

Internally they are smd devices and little you can do to them.

The reason I asked earlier about if you had run any demo on the dev board was to try and establish if that board was also ok, particularly the connections to pin1 the Mclre / Vpp pin.

nachum

New Member

Wp100

Well-Known Member

The Troubleshooting via the Pickit2 program must be intially done, as the opening screen states, with nothing connected to it other than your test meter wires.

So with the Minikit2 plugged into the usb lead and the output connector totally empty, connect your meter + lead to Vpp pin 1 and your meter — lead to pin 3 — your meter should be set to the dc volts range.

Do you get anything near 12v being shown ?

Also try the +5v Vdd again.

nachum

New Member

Wp100

Well-Known Member

Well even if you test it without the Fluke connected it should still show 12v on the diagnostic screen — looks like you have been unlucky and got a duff one.

Back to the suppliers then.

Attachments

colin55

Well-Known Member

nachum

New Member

How do I see 11+ volts? the USB is 5 volts.
I get an error vpp

Attachments

nachum

New Member

nachum

New Member

Could be that the PICKIT not know to program the PIC16F877??
link —http://cgi.ebay.com/DIY-PICKIT-2-PICKIT2-Microchip-PIC-Programmer-Debugger_W0QQitemZ390148784464QQcmdZViewItemQQptZBI_Electrical_Equipment_Tools?hash=item5ad6ae0150

Current PICkit 2 Programming Support (Mar 2007) Bold font indicates new parts supported in Application v2.20 and device file v1.20
PICkit 2 MPLAB 7.51 & 7.52 Support

Debugging & Programming
PIC12F683*
PIC16F684*, 685*, 687*, 688*, 689*, 690*
PIC16F883, 884, 886, 887
PIC16F913, 914, 916, 917, 946
These devices require an ICD header board to enable debugging with them Programming only
PIC12F508, 509, 510
PIC12F675
PIC16F505, 506
For the most current MPLAB support information, see Readme for PICkit 2 in the “Readmes” subdirectory of “MPLAB IDE.”
(Typically C:Program FilesMicrochipMPLAB IDEReadmes)
Notice: (please read this carefully for some often asked questions)

1 Device Support List (For reference only) (IDE 7.62, for latest version please check your readme file)
1.1 Debugger — Full Support
PIC16F690*
PIC16F884
PIC16F887

PIC16F883
PIC16F886
PIC16F917

1.2 Debugger — Beta Support
PIC12F629*

PIC16F627A*
PIC16F737
PIC16F874A

PIC16F628A*
PIC16F747
PIC16F876

PIC16F630*
PIC16F767
PIC16F876A

PIC16F631*
PIC16F777
PIC16F877

PIC16F636*
PIC16F785*
PIC16F877A

PIC16F648A*
PIC16F818
PIC16F88

PIC16F676*
PIC16F819
PIC16F882

PIC16F677*
PIC16F87
PIC16F913

PIC16F684*
PIC16F870
PIC16F914

PIC16F685*
PIC16F871
PIC16F916

PIC16F687*
PIC16F872
PIC16F946

PIC16F688*
PIC16F873
PIC16HV785*

PIC18F1220
PIC18F2682
PIC18F6310

PIC18F1230+
PIC18F2685
PIC18F6390

PIC18F1320
PIC18F4220
PIC18F6410

PIC18F1330+
PIC18F4221
PIC18F6490

PIC18F2220
PIC18F4320
PIC18F6520

PIC18F2221
PIC18F4321
PIC18F6525

PIC18F2320
PIC18F4331
PIC18F6527

PIC18F2321
PIC18F4410
PIC18F6585

PIC18F2331
PIC18F442
PIC18F6620

PIC18F2410
PIC18F4420
PIC18F6621

PIC18F242
PIC18F4423
PIC18F6622

PIC18F2420
PIC18F4431
PIC18F6627

PIC18F2423
PIC18F4450
PIC18F6628

PIC18F2431
PIC18F4455
PIC18F6680

PIC18F2450
PIC18F4458
PIC18F6720

PIC18F2455
PIC18F448
PIC18F6722

PIC18F2458
PIC18F4480
PIC18F6723

PIC18F248
PIC18F4510
PIC18F8310

PIC18F2480
PIC18F4515
PIC18F8390

PIC18F2510
PIC18F452
PIC18F8410

PIC18F2515
PIC18F4520
PIC18F8490

PIC18F252
PIC18F4523
PIC18F8520

PIC18F2520
PIC18F4525
PIC18F8525

PIC18F2523
PIC18F4550
PIC18F8527

PIC18F2525
PIC18F4553
PIC18F8585

PIC18F2550
PIC18F458
PIC18F8620

PIC18F2553
PIC18F4580
PIC18F8621

PIC18F258
PIC18F4585
PIC18F8622

PIC18F2580
PIC18F45K20
PIC18F8627

PIC18F2585
PIC18F4610
PIC18F8628

PIC18F25K20
PIC18F4620
PIC18F8680

PIC18F2610
PIC18F4680
PIC18F8720

PIC18F2620
PIC18F4682
PIC18F8722

PIC18F2680
PIC18F4685
PIC18F8723

1.3 Programmer — Full Support
PIC12F510

PIC16F506
PIC16F88
PIC16F887

PIC16F684
PIC16F883
PIC16F917

1.4 Programmer — Beta Support
PIC12F508

Источник

Вот пример, извините если мс древняя, что есть.

Все просто вроде- 5 выводов, подавать питание на МК или с Пикита2 идет уже нужное?

И кстати куда его подавать? Нет такого контакта Vdd для программирования.

Вобщем при подключении к МК — прога Pickit2 Programmer выдает ошибку :

«Pickit2 VPP voltage level error. Check target & retry оператион»

причем просто при подключении к МК.

Вообще еще ни разу не видел в окошке программы какие-то коды или цыфры.

И что за вывод PGM — судя по даташиту это «низковольтный тактовый сигнал включения(?)» простите за мой французский.

Ну и сразу скажу — пикит2 рабочий, прошивает, МК (микроконтролёр) который щас хочу прошить научиться — тоже полностью рабочий, это целиком собранное устройство.

Я хочу научиться прошиватьпонимать сам процесс, поскольку полный нуль в этом деле. Поэтому взял в аренду рабочую плату «для опытов». Проц стоит PIC18LF252, что для опытов я думаю не принципиально.

ЗЫ. Попробовал другую плату — и наконец-то заработало! Прочитал прошивку, сохранил — щас надо как-то открыть ее. Пробую программу MPLAB IDE версии 8.46. — но она не может открыть, вообще ни один файл!

Да чтож за дело то это такое…

Пишет «системе не удается найти указанный путь», да это ни в какие рамки не лезет!!! Издеваются!

В чем трабла — не пойму. Как-то же должно открываться, для изменений или переделки.

Сам писать прошивки не могу, хочу попробовать в теле прошивки изменить какие-то данные и посмотреть к чему и как это приводит.

Например время горения дисплея не 5 сек, а чтобы загорался при нажатии и угасал тоже при нажатии. кнопки. То бишь методом тыка пробовать и смотреть на результат.

Видел как написаны прошивки, это нужно с этим работать чтобы писать подобные вещи. Да и отучиться не мешало бы. Учиться не поздно, статей много, желание есть. И задумки тоже есть.

КСтати, если одна плата не отвечает на запросы программера, а вторая включилась — может это зависит как раз от чипа — в первой плате стоит 18LF252, а во второй — уже 18F2520. Чип-то новее!

Или какая-то защита от чтения? Тоже не знаю…

Изменено 3 Февраля, 2016 в 17:52 пользователем mitrych

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