Hi team,
In DS90UB954, crystals are used.
The crystal will be NX3225SA.
The matching of the crystal has been checked and the capacitance of the capacitor has been adjusted.
However, in the noise test, the immunity is weak, so please tell me a little about it.
Question 1
Are there any details that we should pay attention to when connecting the 954 and the crystal?
For example, restrictions on the distance between the components of the 954 and the crystal, or precautions for pattern routing.
Question 2
Looking at the EVM, I see that the 954 and crystal are mounted on different layers.
I think it would be ideal to mount them on the same layer, but is there a reason why you mounted them on different layers?
Please let me know which you would recommend.
Question 3.
In EVM, a shield case can be mounted as part reference H1.
What is the purpose of the shield case?
Is a shield case required when using crystals? Or is it recommended?
Best regards,
Masanori