Skip to main content
FCola.16
Associate
Jul 22, 2019 11:38 AM UTC
Question

Have you had any problems routing track PA12 (48) to TCXO_VDD (1) under the Murata CMWX1ZZABZ-078 module?

When I connect the two pads at the PCB, routing under the module, TCXO_VDD will have a voltage of 0.8, irrespective of whether PA12 is high or low. In fact, I have only found it by taking the cover of the module and find a capacitor pad where TXCO is connected.

When set to high, the track voltage will spike for a few nanoseconds and then quiesce again to the 0.8 V level.

I am trying to solve the situation by routing from outside the module, like we can find at the LRWAN1 development board. Will it be enough or is there some sort of a weird module quirk I have to consider?

Thanks in advance.

This topic has been closed for replies.