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RTC problem in 2136

RTC problem in 2136

2006-03-22 by Pandurang Shinde

Hi,
          I am using LPC2136.I am facing some RTC related problems in few boards. I am writing some value in RTC on power on but it is not incrementing. 
         This type of problem is not in all board but few of them.Some board work without any problem.
          I also observed that when i use jlink for debug ,value of RTC register(SEC,MIN etc) are incrementing ,but these increment are slow. When i come out of debug & send data on serial port ,i have getting 0 data continously.
         I have also check VBAT voltage which found ok.
         Please help me ,if any one can.
     
Regards,
Pandurang S.


[Non-text portions of this message have been removed]

Re: RTC problem in 2136

2006-03-22 by Guillermo Prandi

--- In lpc2000@yahoogroups.com, "Pandurang Shinde" <pandurang@...> 
wrote:
>
> Hi,
>           I am using LPC2136.I am facing some RTC related problems 
in few boards. I am writing some value in RTC on power on but it is 
not incrementing. 
>          This type of problem is not in all board but few of 
them.Some board work without any problem.
>           I also observed that when i use jlink for debug ,value of 
RTC register(SEC,MIN etc) are incrementing ,but these increment are 
slow. When i come out of debug & send data on serial port ,i have 
getting 0 data continously.
>          I have also check VBAT voltage which found ok.
>          Please help me ,if any one can.
>      
> Regards,
> Pandurang S.
> 
> 
> [Non-text portions of this message have been removed]
>

Do you use an external crystal? Have you checked the oscilator pins 
for a 32 KHz wave?

Guille

RE: [lpc2000] Re: RTC problem in 2136

2006-03-22 by Pandurang Shinde

thanks for immediate reply.
Yes i am using external watch crystal of 32 khz. I have also found that i am not getting oscillation on that board(the board in which i am not getting RTC updaed value ). But when i used same crystal on other board it( crystal ) seems working,so crystal is fine.
What are the possible reason that i am not getting oscillation with working crystal
 
Regards,
Pandurang S.

________________________________
Show quoted textHide quoted text
From: lpc2000@yahoogroups.com on behalf of Guillermo Prandi
Sent: Wed 3/22/2006 4:03 PM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Re: RTC problem in 2136


--- In lpc2000@yahoogroups.com, "Pandurang Shinde" <pandurang@...> 
wrote:
>
> Hi,
>           I am using LPC2136.I am facing some RTC related problems 
in few boards. I am writing some value in RTC on power on but it is 
not incrementing. 
>          This type of problem is not in all board but few of 
them.Some board work without any problem.
>           I also observed that when i use jlink for debug ,value of 
RTC register(SEC,MIN etc) are incrementing ,but these increment are 
slow. When i come out of debug & send data on serial port ,i have 
getting 0 data continously.
>          I have also check VBAT voltage which found ok.
>          Please help me ,if any one can.
>      
> Regards,
> Pandurang S.
> 
> 
> [Non-text portions of this message have been removed]
>

Do you use an external crystal? Have you checked the oscilator pins 
for a 32 KHz wave?

Guille







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[Non-text portions of this message have been removed]

Re: [lpc2000] Re: RTC problem in 2136

2006-03-22 by Leon Heller

----- Original Message -----
Show quoted textHide quoted text
From: "Pandurang Shinde" <pandurang@...>
To: <lpc2000@yahoogroups.com>
Sent: Wednesday, March 22, 2006 11:35 AM
Subject: RE: [lpc2000] Re: RTC problem in 2136


> thanks for immediate reply.
> Yes i am using external watch crystal of 32 khz. I have also found that i 
> am not getting oscillation on that board(the board in which i am not 
> getting RTC updaed value ). But when i used same crystal on other board 
> it( crystal ) seems working,so crystal is fine.
> What are the possible reason that i am not getting oscillation with 
> working crystal

Are you *sure* the leads are properly soldered to the pads? Remove any flux, 
it might be conductive. Chip might be faulty.

Leon
--
Leon Heller, G1HSM
leon.heller@...
http://www.geocities.com/leon_heller

Re: RTC problem in 2136

2006-03-22 by topandurangs

--- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@...> 
wrote:
>
> ----- Original Message ----- 
> From: "Pandurang Shinde" <pandurang@...>
> To: <lpc2000@yahoogroups.com>
> Sent: Wednesday, March 22, 2006 11:35 AM
> Subject: RE: [lpc2000] Re: RTC problem in 2136
> 
> 
> > thanks for immediate reply.
> > Yes i am using external watch crystal of 32 khz. I have also 
found that i 
> > am not getting oscillation on that board(the board in which i am 
not 
> > getting RTC updaed value ). But when i used same crystal on 
other board 
> > it( crystal ) seems working,so crystal is fine.
> > What are the possible reason that i am not getting oscillation 
with 
> > working crystal
> 
> Are you *sure* the leads are properly soldered to the pads? Remove 
any flux, 
> it might be conductive. Chip might be faulty.
> 
> Leon
> --
> Leon Heller, G1HSM
> leon.heller@...
> http://www.geocities.com/leon_heller
>


hi,
       Thanks once again.
       Chip might be faulty.
       Is there is any chance of this thing.
       Because out of 50 boards i am facing this problem on nearly 
more than 5 boards. 

Regards,
Pandurang S.

Re: [lpc2000] Re: RTC problem in 2136

2006-03-22 by Leon Heller

----- Original Message -----
Show quoted textHide quoted text
From: "topandurangs" <pandurang@...>
To: <lpc2000@yahoogroups.com>
Sent: Wednesday, March 22, 2006 12:59 PM
Subject: [lpc2000] Re: RTC problem in 2136


> --- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@...>
> wrote:
>>
>> ----- Original Message ----- 
>> From: "Pandurang Shinde" <pandurang@...>
>> To: <lpc2000@yahoogroups.com>
>> Sent: Wednesday, March 22, 2006 11:35 AM
>> Subject: RE: [lpc2000] Re: RTC problem in 2136
>>
>>
>> > thanks for immediate reply.
>> > Yes i am using external watch crystal of 32 khz. I have also
> found that i
>> > am not getting oscillation on that board(the board in which i am
> not
>> > getting RTC updaed value ). But when i used same crystal on
> other board
>> > it( crystal ) seems working,so crystal is fine.
>> > What are the possible reason that i am not getting oscillation
> with
>> > working crystal
>>
>> Are you *sure* the leads are properly soldered to the pads? Remove
> any flux,
>> it might be conductive. Chip might be faulty.
>>
>> Leon
>> --
>> Leon Heller, G1HSM
>> leon.heller@...
>> http://www.geocities.com/leon_heller
>>
>
>
> hi,
>       Thanks once again.
>       Chip might be faulty.
>       Is there is any chance of this thing.
>       Because out of 50 boards i am facing this problem on nearly
> more than 5 boards.

I could understand it with one board, but it's *very* unlikely with five 
boards. Those 32 kHz crystals can cause more problems than the 
high-frequency ones. - the feedback capacitors might need to be altered for 
the crystal characteristics (load capacitance and series resistance) and 
stray capacitance with your layout.

Leon

Re: [lpc2000] Re: RTC problem in 2136

2006-03-22 by Tom Walsh

topandurangs wrote:

>--- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@...> 
>wrote:
>  
>
>>----- Original Message ----- 
>>From: "Pandurang Shinde" <pandurang@...>
>>To: <lpc2000@yahoogroups.com>
>>Sent: Wednesday, March 22, 2006 11:35 AM
>>Subject: RE: [lpc2000] Re: RTC problem in 2136
>>
>>
>>    
>>
>>>thanks for immediate reply.
>>>Yes i am using external watch crystal of 32 khz. I have also 
>>>      
>>>
>found that i 
>  
>
>>>am not getting oscillation on that board(the board in which i am 
>>>      
>>>
>not 
>  
>
>>>getting RTC updaed value ). But when i used same crystal on 
>>>      
>>>
>other board 
>  
>
>>>it( crystal ) seems working,so crystal is fine.
>>>What are the possible reason that i am not getting oscillation 
>>>      
>>>
>with 
>  
>
>>>working crystal
>>>      
>>>
>>Are you *sure* the leads are properly soldered to the pads? Remove 
>>    
>>
>any flux, 
>  
>
>>it might be conductive. Chip might be faulty.
>>
>>Leon
>>--
>>Leon Heller, G1HSM
>>leon.heller@...
>>http://www.geocities.com/leon_heller
>>
>>    
>>
>
>
>hi,
>       Thanks once again.
>       Chip might be faulty.
>       Is there is any chance of this thing.
>       Because out of 50 boards i am facing this problem on nearly 
>more than 5 boards. 
>
>  
>

That sounds like a manufacturing problem more than an engineering 
issue.  In your situation, assuming the circuit is designed correctly, I 
would carefully inspect the boards visually under a microscope to see 
how clean the solder joints are.  I have seen boards which were not 
properly reflowed leaving debris around the pins: tiny little clusters 
of solder balls which have not melted properly nor have been cleaned off.

I had one manufacturer have me inspect some boards they had gotten from 
the assembly house which did not run.  Again, it was a small but 
significant number of boards.  Under a 20X microscope, you could clearly 
see the solder debris which was shorting pins out.  The debris was 
between the pins and back inside from the end of the leads: poor job of 
reflow + cleaning.

TomW


-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
----------------------------------------------------

RE: [lpc2000] Re: RTC problem in 2136

2006-03-22 by Gordon Melby

I have had issues with 32 khz crystals when there are digital signals in the
area of the crystal. make sure you have ground plane protecting the crystal
pins
 
Gordon
Show quoted textHide quoted text
-----Original Message-----
From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf Of
Pandurang Shinde
Sent: Wednesday, March 22, 2006 5:35 AM
To: lpc2000@yahoogroups.com
Subject: RE: [lpc2000] Re: RTC problem in 2136


thanks for immediate reply.
Yes i am using external watch crystal of 32 khz. I have also found that i am
not getting oscillation on that board(the board in which i am not getting
RTC updaed value ). But when i used same crystal on other board it( crystal
) seems working,so crystal is fine.
What are the possible reason that i am not getting oscillation with working
crystal

Regards,
Pandurang S.

________________________________

From: lpc2000@yahoogroups.com on behalf of Guillermo Prandi
Sent: Wed 3/22/2006 4:03 PM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Re: RTC problem in 2136


--- In lpc2000@yahoogroups.com, "Pandurang Shinde" <pandurang@...> 
wrote:
>
> Hi,
>           I am using LPC2136.I am facing some RTC related problems 
in few boards. I am writing some value in RTC on power on but it is 
not incrementing. 
>          This type of problem is not in all board but few of 
them.Some board work without any problem.
>           I also observed that when i use jlink for debug ,value of 
RTC register(SEC,MIN etc) are incrementing ,but these increment are 
slow. When i come out of debug & send data on serial port ,i have 
getting 0 data continously.
>          I have also check VBAT voltage which found ok.
>          Please help me ,if any one can.
>      
> Regards,
> Pandurang S.
> 
> 
> [Non-text portions of this message have been removed]
>

Do you use an external crystal? Have you checked the oscilator pins 
for a 32 KHz wave?

Guille







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Re: RTC problem in 2136

2006-03-23 by Gerrit de Waard

Hello,
You can try the following:
@ RTC init, clear all RTC registers --> (write 0 to all)
than make sure, you do not write the 'reserved' bits, this can cause 
something like that to happen.. I had sort of the same problem.. and 
the earlier mentioned steps solved my problem!!
Good luck!
Gerrit de Waard


--- In lpc2000@yahoogroups.com, "Gordon Melby" <gm1529@...> wrote:
>
> I have had issues with 32 khz crystals when there are digital 
signals in the
> area of the crystal. make sure you have ground plane protecting the 
crystal
> pins
>  
> Gordon
>  
> 
> -----Original Message-----
> From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On 
Behalf Of
> Pandurang Shinde
> Sent: Wednesday, March 22, 2006 5:35 AM
> To: lpc2000@yahoogroups.com
> Subject: RE: [lpc2000] Re: RTC problem in 2136
> 
> 
> thanks for immediate reply.
> Yes i am using external watch crystal of 32 khz. I have also found 
that i am
> not getting oscillation on that board(the board in which i am not 
getting
> RTC updaed value ). But when i used same crystal on other board it( 
crystal
> ) seems working,so crystal is fine.
> What are the possible reason that i am not getting oscillation with 
working
> crystal
> 
> Regards,
> Pandurang S.
> 
> ________________________________
> 
> From: lpc2000@yahoogroups.com on behalf of Guillermo Prandi
> Sent: Wed 3/22/2006 4:03 PM
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] Re: RTC problem in 2136
> 
> 
> --- In lpc2000@yahoogroups.com, "Pandurang Shinde" <pandurang@> 
> wrote:
> >
> > Hi,
> >           I am using LPC2136.I am facing some RTC related 
problems 
> in few boards. I am writing some value in RTC on power on but it is 
> not incrementing. 
> >          This type of problem is not in all board but few of 
> them.Some board work without any problem.
> >           I also observed that when i use jlink for debug ,value 
of 
> RTC register(SEC,MIN etc) are incrementing ,but these increment are 
> slow. When i come out of debug & send data on serial port ,i have 
> getting 0 data continously.
> >          I have also check VBAT voltage which found ok.
> >          Please help me ,if any one can.
> >      
> > Regards,
> > Pandurang S.
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
> 
> Do you use an external crystal? Have you checked the oscilator pins 
> for a 32 KHz wave?
> 
> Guille
> 
> 
> 
> 
> 
> 
> 
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RE: [lpc2000] Re: RTC problem in 2136

2006-03-25 by Pandurang Shinde

hi,
        thanks for suuggestion,i check my initlization & i nowhere found that i am writing one reserved bit.
        My  RTC initlization routine is as below.
 
        CCR=0x13; /* Reset the clock ,clock from external osc,RTC enable*/
       ILR=0x03; /* Clear the RTC Interrupt  */
       CCR=0x11; /* RTC reset changeed to 0 */
       CIIR = 0x01;  //interrupt on Second counter 
        
 
Regards,
Pandurang S.

________________________________
Show quoted textHide quoted text
From: lpc2000@yahoogroups.com on behalf of Gerrit de Waard
Sent: Thu 3/23/2006 6:20 PM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Re: RTC problem in 2136


Hello,
You can try the following:
@ RTC init, clear all RTC registers --> (write 0 to all)
than make sure, you do not write the 'reserved' bits, this can cause 
something like that to happen.. I had sort of the same problem.. and 
the earlier mentioned steps solved my problem!!
Good luck!
Gerrit de Waard


--- In lpc2000@yahoogroups.com, "Gordon Melby" <gm1529@...> wrote:
>
> I have had issues with 32 khz crystals when there are digital 
signals in the
> area of the crystal. make sure you have ground plane protecting the 
crystal
> pins
>  
> Gordon
>  
> 
> -----Original Message-----
> From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On 
Behalf Of
> Pandurang Shinde
> Sent: Wednesday, March 22, 2006 5:35 AM
> To: lpc2000@yahoogroups.com
> Subject: RE: [lpc2000] Re: RTC problem in 2136
> 
> 
> thanks for immediate reply.
> Yes i am using external watch crystal of 32 khz. I have also found 
that i am
> not getting oscillation on that board(the board in which i am not 
getting
> RTC updaed value ). But when i used same crystal on other board it( 
crystal
> ) seems working,so crystal is fine.
> What are the possible reason that i am not getting oscillation with 
working
> crystal
> 
> Regards,
> Pandurang S.
> 
> ________________________________
> 
> From: lpc2000@yahoogroups.com on behalf of Guillermo Prandi
> Sent: Wed 3/22/2006 4:03 PM
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] Re: RTC problem in 2136
> 
> 
> --- In lpc2000@yahoogroups.com, "Pandurang Shinde" <pandurang@> 
> wrote:
> >
> > Hi,
> >           I am using LPC2136.I am facing some RTC related 
problems 
> in few boards. I am writing some value in RTC on power on but it is 
> not incrementing. 
> >          This type of problem is not in all board but few of 
> them.Some board work without any problem.
> >           I also observed that when i use jlink for debug ,value 
of 
> RTC register(SEC,MIN etc) are incrementing ,but these increment are 
> slow. When i come out of debug & send data on serial port ,i have 
> getting 0 data continously.
> >          I have also check VBAT voltage which found ok.
> >          Please help me ,if any one can.
> >      
> > Regards,
> > Pandurang S.
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
> 
> Do you use an external crystal? Have you checked the oscilator pins 
> for a 32 KHz wave?
> 
> Guille
> 
> 
> 
> 
> 
> 
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