VDD_1P5_CAP on the MKW41Z512CAT4R

[johncheriton]

Hi,

The 75-pin WLCP package for this device has a pin at J8 marked VDD_1P5_CAP however that pin is not mentioned in the DCDC Power Management data sheet or and of the other data sheets or hardware guides.

What should be done with this pin? I am bypassing the DCDC convertor and connecting all the VDDs to our incoming 3V3 supply.

In this case should I connect this pin to a reservoir capacitor and, if so, what size capacitor is  expected at this pin?

[mario_castaneda · Accepted solution]

Hi John,

VDD_1P5_CAP and VDD_1P5_PMCIN should always be connected together via PCB trace. System designers should take care to ensure this connection is as short as possible.

For a better reference look at the MKW41Z/31Z/21Z Data Sheet

Regards,

Mario

[johncheriton]

Hi Mario,

Yes, you're quite right. There it is in bold type on top of the Signal Multiplexing page. I must have skipped over that many times while looking for an answer! So much for the search function in Preview...

Thanks

John