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Two more Q's on KW26 board without radios

Question asked by R Oleksuk on Jun 27, 2019
Latest reply on Jul 9, 2019 by Estephania Martinez

Couple more issues with KW36 board where we'll not be using the radio portions:

 

1. The datasheet appears to specify the crystal in terms of the RF section's tight requirements...

 

Since we are not using the RF features, can we use the crystals below (equivalent to each other), with very similar specs, but modestly relaxed tolerance & stability, given we won't be needing to adhere to BLE etc spectrum/channel specifications...

 

ABM11AIG-32000MHZ-4Z-T3

ECS-320-10-37Q-ES-TR

 

If not, is there a specification that we could use in lieu of the ultra-tight ones listed in the datasheet? Perhaps from another chip that does not have the RF section?

 

2. And the 3pF caps on PTC1, PTC2, PTC3, and PTC4 recommended in your ap-note AN12181 - are they actually needed given that the RF section is not going to be activated?

 

(I am posting this after not getting any responses when I asked these on the other recent thread I had for this same project)

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