Re: 52235/52230 problem

Dear Mark

I had cheked the the VDD1 and VDD2 supplies. Vdd2 it is 2.5 and on VDD1 I am getting frequency instead of clean DC. I had used 0.22 uF decoupling as used in EVB. This consistant problem I am facing is The File gets downloaded to the MCF52230 but does not execute. All three board I had assembled does the same. 


Sanjay Morab

Accord Electronics
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  ----- Original Message ----- 
  From: Mark Butcher 
  To: Sanjay Morab 
  Sent: Monday, January 28, 2008 4:02 PM
  Subject: AW: [ColdFire] 52235/52230 problem


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Sanjay

   

  I recommend using the Layout guide in the following Freescale Application Note: AN2759 [it is for the NE64 but suitable also for the Coldfire]
   

   http://www.freescale.com/files/microcontrollers/doc/app_note/AN2759.pdf?fpsp=1&WT_TYPE=Application%20Notes&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=pdf&WT_ASSET=Documentation

   

  The MC9S12NE64 has a heat sink area on the bottom of the chip which is used to help dissipate heat (from the PHY) to the board. This isn't available on the M5223X and so it does tend to run a little hot.

  Check the core supply voltage on VDD1 and VDD2 - it should be decoupled with capacitors and measure about 2.5V. I did have a board (M52233) which suddenly stopped working and this voltage was too low - it became very hot. After replacing the chip the board worked correctly again.

   

  Good luck

   

  Regards

   

  Mark

   

   

   

  Mark Butcher Bsc (Hons) MPhil MIEE

   

  M.J.Butcher Consulting                

  Obere Bahnhofstr. 13,  CH-5507 Mellingen,

  Switzerland         www.mjbc.ch / www.uTasker.com

  056 491 48 10 / 079 402 26 37 / Skype: M_J_Butcher

   

   

   

  -----Ursprüngliche Nachricht-----
  Von: [email protected] [mailto:[email protected]] Im Auftrag von Sanjay Morab
  Gesendet: Montag, 28. Januar 2008 03:04
  An: [email protected]
  Betreff: Re: [ColdFire] 52235/52230 problem

   

  Dear Mark

   

  One information also required.

   

  When we are using the two layer board for the ETHRNET what should be trace width and separation required from out put of the Magnatics to RJ45 connector as those two pairs are connected as differntial pair.

   

   

  regards

  Sanjay Morab

     

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