Re: [Usbpicprog-technical] PIC 16F628A

[ShadowCaster <sha...@gm...>]

Hello Frans,

Probably you didn't receive my previous e-mail due to the attached picture,

VDD is almost perfect 5V if i remember correctly.

Can i change the D4 on my current board without any other side effects or
there are more changes needed ? I printed a board based on your through
hole schematics so if there are more changes involved probably there will
be difficult to implement.

Regards,
Nick


On Wed, Apr 24, 2013 at 9:22 PM, Frans Schreuder
<fra...@gm...>wrote:

>  Hello Nick,
>
> The voltage is on the low side. For this reason, in the new schematic, D4
> has been replaced by a 0R resistor (or a wire). Have you also measured VDD?
>
> Kind regards,
>
> Frans Schreuder
>
>
> On 04/24/2013 07:54 PM, Nick wrote:
>
> Hello Frans,
>
> I measured the voltage between VPP and GND using a multimeter in the pic
> pins, it is 12.21V. I assume that this is not enough for programing the
> 628A?
>
> On 24/4/2013 3:46 μμ, Frans Schreuder wrote:
>
> The io_test function is good for an indication, but not very accurate in
> voltage. Using a multimeter is a better option.
>
> On 24-4-2013 13:58, ShadowCaster wrote:
>
> Hello Frans,
>
>  Thanks for your quick reply i'll double check the voltages but i think
> that VPP is 11.4 to 12.3 when i try the I/O test function in the software,
> i'll connect the programmer with the pic and check with a multimeter and
> the I/O test function.
>
>
> On Wed, Apr 24, 2013 at 2:26 PM, Frans Schreuder <fra...@gm...
> > wrote:
>
>>  Dear Nick,
>>
>> The 16F628A PIC does work with the current software / firmware, although
>> this pic is very selective when it comes to operating voltages.
>> Please verify that VDD > 4.5V and VPP >13V with the pic connected.
>>
>> Regards,
>>
>> Frans
>>
>>
>> On 24-4-2013 13:22, ShadowCaster wrote:
>>
>>  Hello,
>>
>>  I implemented the programmer based on the designs and it
>> works flawlessly with a PIC 18F2550 and a 18F1320.
>> The thing is that i tried to program a 16F628A that should be compatible,
>> although it is properly detected it doesn't write any data to it. When i
>> read it i get a repeated pattern : FF 3F FF 3F.
>>
>>  I tried the same pic with a old serial programmer and it is written
>> without a problem so it is not a pic problem
>>
>>  I tried both the latest stable as well as the latest devel
>> firmware/software. Is the functionality for this model broken in the latest
>> versions? Can somebody verify?
>>
>>  Regards
>> Nick
>>
>>
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-- 
When a man lies, he murders some part of the world..
These are the pale deaths which men miscall their lives..
All these I cannot bear to witness any longer..
Cannot the kingdom of salvation take me home?