RT117X crystal oscillator not running

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RT117X crystal oscillator not running

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dbenwilson
Contributor I

I am having a problem bringing up my RT1171 processor design with the 24 MHz oscillator not running. I found in the datasheet that the oscillator is part of the LPSR_ANA domain. The oscillator section does not seem to have power as the pins on the crystal are both low when power is applied to the board.

 

See the attached document with a description and blocks of my schematic.  

 

Thanks for your help!

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dbenwilson
Contributor I
I found my problem. I was not using the processors ADC or DAC so I had not connected ADC_VREFH, VDDA_ADC_1P8 and VDDA_ADC_3P3 per the IMXRT1170IEC.pdf technical data sheet. VDDA_1P8_IN was connected to GND with a 10k resistor as well and there is my problem, this supply needs to be connected to 1.8V and once I connected this, my oscillator runs.

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859 次查看
dbenwilson
Contributor I
I found my problem. I was not using the processors ADC or DAC so I had not connected ADC_VREFH, VDDA_ADC_1P8 and VDDA_ADC_3P3 per the IMXRT1170IEC.pdf technical data sheet. VDDA_1P8_IN was connected to GND with a 10k resistor as well and there is my problem, this supply needs to be connected to 1.8V and once I connected this, my oscillator runs.
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