Problem with ADSP21262 processor
Started by ●February 2, 2010
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 ●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
> 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 ●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..
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..
