How to connect unused LDO supplies

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How to connect unused LDO supplies

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emil
Contributor III

I'm currently working on the iMX6 SABRE-SD platform (Solo/DualLite). From what I can see the PF0100 configuration is in one of the pre-programmed configurations (although schematic states you use non-programmed PF0100), namely F0. In will not use a couple of LDO outputs in my final design, and would like to avoid programming the PF0100 myself.

Is it possible to use the pre-programmed F0 configuration even though all LDO's are not connected? How do I disconnect them? Do I just let them be NC? This would mean that the startup sequence would try to output a voltage from the LDOs, but not succeed.

Thanks for your help!

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weidong_sun
NXP TechSupport
NXP TechSupport

Hello,emil,

      For those LDOs in MMPF0100 that you don't use, you can disable them by VGENxEN bit in software, and float those output pins on schematic.

      The following is a list of controlling register in MMPF0100, you can find it in datasheet:

mmpf0100-LDOs.png

Regards,

Weidong

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emil
Contributor III

Hello,

Yes, I can disable them. But what I'm wondering is if it is a problem that I use a startup sequence that starts up these LDOs.

Best Regards,

Emil

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weidong_sun
NXP TechSupport
NXP TechSupport

Hello,emil,

      Because those LDOs are not used, They don't affect power up sequence .

Weidong

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