24 Mhz Oscillator Not Starting iMX6UL Rev 1.2

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24 Mhz Oscillator Not Starting iMX6UL Rev 1.2

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summertanks
Contributor I
I am using MCIMX6G3CVM05AB
iMX6 UltraLite MAPBGA 14x14 0.8mm 528MHz
 
Rev 1.2 Maskest ID 2N52P
 
IMG_6390.jpeg
 
2. Errata on the i.MX 6UltraLite. 
 
PastedGraphic-1.png
 
Reference Schematic is 
 
PastedGraphic-3.png
 
3. Reference Schematic migration
 
PastedGraphic-4.png
 
Hence Circuit becomes
 
IMG_6392.jpeg

 

My Schematic

 

PastedGraphic-5.png

 

At C28 Pin 1 - Vavg 105mV

 

pic_8_3.bmp

 

 

At C27 Pin 1 - Frequency 32.765 KHz

 

pic_8_1.bmp

 

At Pin C26 Pin 1 - Vavg 115mV

 

pic_8_4.bmp

 

At C25 Pin 1 - Frequency - Nil Vavg 480mV

 

pic_8_2.bmp

   

POR is Good, All Power rails are good.

So Question is : Why is the oscillator not starting up? 

  

 
 
 
 
 
 
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embedded_Dev
Contributor II

Hi igorpadykov
      

Can u please share me the schematic document for MCIMX6G3CVM05AB  of series SCH-28616 REV C3
Thanks in advance

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summertanks
Contributor I

I don't have that. I have 28617 Rev C1. Which is the latest?

Please share the same with me if possible.

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi summertanks

 

one can try with other crystal or consider Table 11. Oscillator and clock recommendations

Hardware Development Guide for the i.MX 6UltraLite Applications Processor

like 24Mhz crystal requirements, try to adjust XTALI bias resistor.

 

Best regards
igor

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