In comp.arch.embedded,
CBFalconer <cbfalconer@yahoo.com> wrote:
>eeh wrote:
>> Sagaert Johan wrote:
>> 
>>> i suggest you run a test over the complete temperature range.
>>>
>>> It might run overclocked at 25 degrees ,but may fail in a hot
>>> summer. Bad practice if you want a stable sytem.
>> 
>> Oh I see. Could you teach me how can I do that if I have no
>> temperature chamber?
>
>Use a hair dryer.  Cautiously.
>
Or a cardbord box. If your device dissipates enough heat it will
warm up all by it self. Otherwise add a little heat somewhere,
possibly with the above mentioned testing equipment. ;-) Oh and
keep an eye on the temperature, you don't want to start a fire.

Most household ovens can be set as low as 50 degrees C, but check
with a thermometer.

And there are many other sources of suitable heat in most houses,
so experiment a little.

And you may want to check in the cold as well. fridge, freezer,
cold spray, outside.....


-- 
Stef    (remove caps, dashes and .invalid from e-mail address to reply by mail)

All the world's a stage and most of us are desperately unrehearsed.
		-- Sean O'Casey

eeh wrote:
> Sagaert Johan wrote:
>> i suggest you run a test over the complete temperature range.
>>
>> It might run overclocked at 25 degrees ,but may fail in a hot summer.
>> Bad practice if you want a stable sytem.
>>
>> Johan
> 
> Oh I see. Could you teach me how can I do that if I have no temperature
> chamber?
> 

  Ice chest, light bulb,cold packs, thermometer.
You are over clocking a micro.  Be creative.

eeh wrote:
> Sagaert Johan wrote:
> 
>> i suggest you run a test over the complete temperature range.
>>
>> It might run overclocked at 25 degrees ,but may fail in a hot
>> summer. Bad practice if you want a stable sytem.
> 
> Oh I see. Could you teach me how can I do that if I have no
> temperature chamber?

Use a hair dryer.  Cautiously.

-- 
"The power of the Executive to cast a man into prison without
 formulating any charge known to the law, and particularly to
 deny him the judgement of his peers, is in the highest degree
 odious and is the foundation of all totalitarian government
 whether Nazi or Communist." -- W. Churchill, Nov 21, 1943

Sagaert Johan wrote:
> i suggest you run a test over the complete temperature range.
>
> It might run overclocked at 25 degrees ,but may fail in a hot summer.
> Bad practice if you want a stable sytem.
>
> Johan

Oh I see. Could you teach me how can I do that if I have no temperature
chamber?

Hul Tytus wrote:
> What size cap did you have there before? And another question - what sort
> of power supply are you using - better stated maybe, how long are the
> wires that bring power to microcontroller?
>
> Neccessary filtering for a power supply always seems questionable.
>
> Hul

Before that I used only two 0.1uF at the regulator. The board is small
which is about 3 inches x 2 inches. The power supply is dc supply (5V)
and the voltage passes a HT7533 linear regulator.

What size cap did you have there before? And another question - what sort 
of power supply are you using - better stated maybe, how long are the 
wires that bring power to microcontroller?

Neccessary filtering for a power supply always seems questionable.

Hul

eeh <eehobbyist@yahoo.com.hk> wrote:
> OK after adding 10uF decoupling cap at 3.3.V supply

i suggest you run a test over the complete temperature range.

It might run overclocked at 25 degrees ,but may fail in a hot summer.
Bad practice if you want a stable sytem.

Johan

"eeh" <eehobbyist@yahoo.com.hk> wrote in message
news:1138634286.076967.253360@g14g2000cwa.googlegroups.com...
> OK after adding 10uF decoupling cap at 3.3.V supply
>

OK after adding 10uF decoupling cap at 3.3.V supply

Don't do it. Use a faster processor instead


"eeh" <eehobbyist@yahoo.com.hk> wrote in message 
news:1138558119.023935.294880@o13g2000cwo.googlegroups.com...
> Hi,
>
> I am going to overclock Atmega16L to 12MHz. I can do that when the JTAG
> header is attached. However, when it is detached, the program seems to
> be not working. I have tried to shut down the power of the emulator and
> it still works when the JTAG header is attached. I do not understand
> why this strange case happens. Could anyone talk to me why this
> happens? As I need to use 3.3V, I need to use Atemga16L.
>