Re: [Usbpicprog-technical] cant program the PIC

[Frans S. <fra...@gm...>]

Hi Balint,

You could try a low voltage shottky diode for the VDD, in stead of 
1n4148. That should do the job.

Frans

Op 1/21/2013 11:39 AM, Bálint Gyenes schreef:
> Hi Frans,
>
> I have only a multimeter, the voltages on the VDD and VPP pins are
> about 4,4V and about 12,3V during the programming process.
> I found the VDD voltage low, so I drove the target PIC's VDD pin with
> a 5V supply. On this way the VPP voltage remained about 12,3V.
>
> Best Regards,
> Balint
>
> 2013/1/21, Frans Schreuder <fra...@gm...>:
>> Hi Balint,
>>
>> I have never tested the 16F628, because it is obsolete but it' s
>> follower the 16F628A should work. The 16F84A should also work but that
>> one is very critical about the voltages. Could you measure VPP and VDD
>> while programming? preferably with an oscilloscope, but if you don't
>> have it try using a multimeter while the programming is in progress.
>>
>> Kind regards,
>>
>> Frans
>>
>> Op 1/21/2013 10:01 AM, Bálint Gyenes schreef:
>>> Hi,
>>>
>>> I build the through-hole version of the usbpicprog. Everything looks
>>> fine, but when I try to program a PIC, I get this:
>>>
>>> Erasing before programming...
>>> Erase OK
>>> Write Code memory OK
>>> Programming the data area of the PIC...
>>> Write Data memory OK
>>> Verifying all areas of the PIC...
>>> Verify code failed at 0x0. Read: 0x00, Expected: 0x12
>>> Programming configuration area of the PIC...
>>> Error programming config memory
>>>
>>> I tried it with two PICs, a 16F628 and a 16F84A, the programmer
>>> detects both, but at programming the situation is the same.
>>> I checked the circuit, it looks correct and the I/O test gives the
>>> required voltages on every pins.
>>> Could it be the problem that some of the mounted transistors
>>> (bs170,bs250, bc547) can't provide enough current?
>>>
>>> Thanks for the reply.
>>>
>>> Best Regards,
>>> Balint
>>>
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