Modified Teensy 4.0 schematic

[Rocketmanandrew]

Im working on upgrading a project i made using the Teensy 3.6 design to the Teensy 4.0 design. What i was going to remove to simplify the design is almost exactly the same except for the power regulator enable pin. My plan was the swap out the regulator for one which you can draw more current from, and power the chip from the 3.3V line. Can i just leave the PIMC_ON_REQ pin unconnected? Here is the schematic and in red what i was planing on removing.

 

[PaulStoffregen]

Can i just leave the PIMC_ON_REQ pin unconnected?

Probably not.

I'd recommend reading "Power Up Sequence" on the T4 bootloader chip page. Click the little javascript buttons to see the sequence on the schematic.

This NXP chip is not like simpler parts where you just apply 3.3V. It has many power rails and a required sequence to start up properly.

 

[Rocketmanandrew]

Probably not.

I'd recommend reading "Power Up Sequence" on the T4 bootloader chip page. Click the little javascript buttons to see the sequence on the schematic.

This NXP chip is not like simpler parts where you just apply 3.3V. It has many power rails and a required sequence to start up properly.

Yea after looking at it it seems like removing that regulator would be a little beyond my skill level so i think ill just leave the regulator. 2 steps of 3.3v regulation, if the main regulator fails i guess i have a backup lol. Thanks for the help.

 

[PaulStoffregen]

You could use transistors rather than another regulator. Look at the MicroMod Teensy from Sparkfun for an example.