27.12M Quartz cann't oscillate of OM5778

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27.12M Quartz cann't oscillate of OM5778

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Contributor I

Customer use OM5778_PN7150S design file mounting their own PCBA. They add 3.3V to Vbat、Vbat1 、Vbat2 and Vdd(pad),and mersured Vdd=Vdda=Vddd=1.8V,Vdd(tx)=Vdd(tx_in)=3.3V. But 27.12M Quartz cann't oscillate, they the Quartz PN in demo BOM. What's the possible reason for this problem?

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Contributor I

Thanks for your reply.

Customer use the quartz in demo BOM as following.

//Y1 NX2016HA_27.12Mhz NX2016AA SURFACE MOUNT TYPE CRYSTAL UNITS NDK

By the way,is it related to power-up squence? They power the Vbat,VDD(pad) and Ven in the same time.

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NXP TechSupport
NXP TechSupport

Hello,

I looked for the datasheet of the device and I was not able to locate the information needed. Still, these are the parameters that your device need to match

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Yes, it can also be affected by the power up sequence, for more information, please check the 12.6.2 Power-up sequences of the data sheet

Regards,

Estephania

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NXP TechSupport
NXP TechSupport

Hello,

Besides you use as a base the files provided you will need to debug your system due to the physical elements as the material or the manufacturer might not be the same. Still, when using a crystal, frequency accuracy and drive level must be carefully selected according to the specification provided in the PN7150 Product Datasheet.

You can also check and use as a reference

PN7150 Antenna Design and Matching Guide 

PN7150 Hardware Design Guide 

Regards ,

Estephania

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