Reply by Maciej Kulesza ●February 2, 20102010-02-02
Hi,

If you are sure that before the processor was soldered 1.2 and 3.3V
supplies were isolated, I would suggest to check whether the ADSP21262
pins are not connected together. Have you soldered the IC pins manually,
or it was soldered automatically using solderng paste ? Why do you think
that these to power supply lines are shorted - are the 3.3V on both of
them ?

Best regards,
Maciej Kulesza

W dniu 2010-02-02 10:28, m...@yahoo.co.in pisze:
>
> I have designed a custom board with ADSP21262. Before soldering the
> processor, I have verified that the core supply(1.2V) and the external
> supply(3.3V) are fairly isolated. But once the processor is soldered,
> they are getting shorted. Why this happens? I am giving power from
> from two different external power supplies. Is it because of the time
> constraint between turning on of the two supplies? Please help me to
> solve the problem..
Reply by Mike Rosing ●February 2, 20102010-02-02
On Tue, 2 Feb 2010, m...@yahoo.co.in wrote:

> I have designed a custom board with ADSP21262. Before soldering the
>processor, I have verified that the core supply(1.2V) and the external
>supply(3.3V) are fairly isolated. But once the processor is soldered,
>they are getting shorted. Why this happens? I am giving power from from
>two different external power supplies. Is it because of the time
>constraint between turning on of the two supplies? Please help me to
>solve the problem..

Double check the pinouts on the processor. You might have a core voltage
going to a 3.3 supply rail on the processor. If they are isolated before
soldering, and shorted afterwards, the processor is supplying the short.

Patience, persistence, truth,
Dr. mike
Reply by meet...@yahoo.co.in ●February 2, 20102010-02-02
I have designed a custom board with ADSP21262. Before soldering the processor, I have verified that the core supply(1.2V) and the external supply(3.3V) are fairly isolated. But once the processor is soldered, they are getting shorted. Why this happens? I am giving power from from two different external power supplies. Is it because of the time constraint between turning on of the two supplies? Please help me to solve the problem..