I have some large (10uF) caps on the system 3.3v power rail which is driven by a DC-DC converter to clean it up. These seems to be a likely the cause of the issue I am seeing. Would adding a separate small 3.3v LDO without any filtering caps...
I am running into this same problem when migrating from T3.6 to T4.1 - the only way I can get the USB interface up is to first power the T4.1 via the USB port, then switch on the 3.3V supply. This works ok for testing, but is risky and means...
Hello,
I have a project where I need to power a Teensy 4.1 from 3.3V. My current setup is as follows:
- I have cut the VUSB/VIN pad jumper on the bottom of the Teensy
- I have connected a CR2032 to the VBAT pin to keep the time management...