Re: [Usbpicprog-technical] PIC 16F628A

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

Ok. Just remember to disconnect vdd whenever  you are going to use external
power
Op 25 apr. 2013 16:50 schreef "ShadowCaster" <sha...@gm...>
het volgende:

> Thank you Frans i'm not using an external power supply so i'll remove D4
> and replace it with a wire and also short the D9.
>
>
> On Thu, Apr 25, 2013 at 4:22 PM, Frans Schreuder <fra...@gm...
> > wrote:
>
>>  I use the MBRL0520 (500mA, 300mV Vf) I don't know any equivalent
>> through hole version but you can probably find it yourself.
>> If you are not using an external power supply for your target chip, you
>> can also just short the diode.
>>
>> Frans
>>
>>
>> On 25-4-2013 15:13, ShadowCaster wrote:
>>
>> Do you have any specific model for the VDD diode to propose? Something
>> like 1N5822RL or 1N5817 will be acceptable?
>>
>>
>> On Thu, Apr 25, 2013 at 3:44 PM, Frans Schreuder <
>> fra...@gm...> wrote:
>>
>>>  Yes you can just replace D4 with a wire, there are no problems if you
>>> do that.
>>> Also it is smart to replace the diode which is in series with VDD with a
>>> low drop shottky diode.
>>>
>>> On 25-4-2013 14:40, ShadowCaster wrote:
>>>
>>>  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 D4 has been replaced by a 0R resistor (or a wire).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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>>>>
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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?
>>>
>>>
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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?
>>
>>
>> ------------------------------------------------------------------------------
>> Try New Relic Now & We'll Send You this Cool Shirt
>> New Relic is the only SaaS-based application performance monitoring service
>> that delivers powerful full stack analytics. Optimize and monitor your
>> browser, app, & servers with just a few lines of code. Try New Relic
>> and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr
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>>
>>
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>> service
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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?
>
>
> ------------------------------------------------------------------------------
> Try New Relic Now & We'll Send You this Cool Shirt
> New Relic is the only SaaS-based application performance monitoring service
> that delivers powerful full stack analytics. Optimize and monitor your
> browser, app, & servers with just a few lines of code. Try New Relic
> and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr
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