I have a project from a while ago made with a teensy 3.2 and I wanted to know if it would be possible in the custom pcb to change it to a 4.0

A

Att1kus

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I want to try do this project from a while ago but it used a 3.2 does anyone know if there would be issues changing this pcb to a 4.0?
 

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I see you are powering the 3.2 with the 3v3 pin--a common practice. The 4.0 should not be powered this way, even though it may work. It should be powered by the VIN pin (and with 3.6 to 5.5 volts). There are some other threads that explain why.

I'm not familiar with your 3.2 footprint, so I can't comment on the pins.
 
KrisKasprzak said:
I see you are powering the 3.2 with the 3v3 pin--a common practice. The 4.0 should not be powered this way, even though it may work. It should be powered by the VIN pin (and with 3.6 to 5.5 volts). There are some other threads that explain why.

I'm not familiar with your 3.2 footprint, so I can't comment on the pins.
Click to expand...
Ah ok thanks I'm not to familiar with teensy's yet so that's good to know.
 
Could be helpful to attach the schematic as picture here in the forum that everybody has easy access to it. I cannot open it.

If you look at the pin out cards of the Teensy 3.2 and the Teensy 4.0, you can check if you are using any pin functions which may have changed.
On the 4.0 there aren't any 5V tolerant pins anymore.
 
I can't see the schematic in KiCAD (it might be an Eagle file), but I know from experience that the Teensy 4's use more power than the Teensy 3's, so a linear regulator without a heatsink that is using a much higher voltage such as 12 or 24V to step down to 3.3 or 5V can get much warmer or even overheat from the additional current. A DC-DC converter won't have this issue as much because it's way more efficient. There's a drop-in replacement for the TO-220 linear regulators, or you can add a heat sink.
 
TomChiron said:
Could be helpful to attach the schematic as picture here in the forum that everybody has easy access to it. I cannot open it.

If you look at the pin out cards of the Teensy 3.2 and the Teensy 4.0, you can check if you are using any pin functions which may have changed.
On the 4.0 there aren't any 5V tolerant pins anymore.
Click to expand...
Thank you. I think I have it worked out now, if not I'll attach a photo.
 
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