I had posted about this issue in another thread, but figured it may deserve its own thread.
I have been trying to power a T3.6 using the 3.3V pin and have been running into issues. The Teensy will run when powered off the 3.3V pin but it won't boot. In order to get it to boot, I need to plug into a USB port and press the reset button or upload a sketch (which I assume also resets the part). However, once it is running, I can disconnect the USB cable and it will continue to run on 3.3V. Looking at the T3.6 schematic, I can't see why this would be the case. Any ideas?
For some context, we are using several T3.6 to run some small instruments for a scientific ballooning campaign. The T3.6's mount to carrier boards that contain a bunch of peripherals (ADCs, line drivers, sensors etc) that all run of 3.3V. As a result we would like to power the T3.6 off 3.3V as well so we don't need a 5V supply to run the Teensy, which is internally stepped down to 3.3V anyway.
I have been trying to power a T3.6 using the 3.3V pin and have been running into issues. The Teensy will run when powered off the 3.3V pin but it won't boot. In order to get it to boot, I need to plug into a USB port and press the reset button or upload a sketch (which I assume also resets the part). However, once it is running, I can disconnect the USB cable and it will continue to run on 3.3V. Looking at the T3.6 schematic, I can't see why this would be the case. Any ideas?
For some context, we are using several T3.6 to run some small instruments for a scientific ballooning campaign. The T3.6's mount to carrier boards that contain a bunch of peripherals (ADCs, line drivers, sensors etc) that all run of 3.3V. As a result we would like to power the T3.6 off 3.3V as well so we don't need a 5V supply to run the Teensy, which is internally stepped down to 3.3V anyway.