I'm at a loss as to how I killed my Teensy 3.0. I had the Teensy 3.0 connected to a LSM303DLH compass and Ultimate GPS modules. The modules are on a breadboard with a separate regulated 5V power source (verified 5.03V) from a wall wart. I fed the modules with 5.0V and both have LDO regs to feed 3.3V/1.8V to their units and logic is all 3.3V. I connected the ground on Teensy to the ground on the breadboard power supply but power the Teensy from USB. See the photos. Links to the modules: https://www.sparkfun.com/products/10703
http://www.adafruit.com/products/746
I tested the GPS and compass separately with the module powered from the Teensy VIN with the Teensy powered by USB. After I connected both to the Teensy at the same time (powered each from the separate power supply), the Teensy stopped responding. So, the power supply connection must have killed the Teensy.
I get 3.3V from the 2 pins on the Teensy. I do not get [HID 16c0:0478] in the syslog when connecting the Teensy. There was no magic smoke, but the Teensy 3.0 is dead. How did I overcurrent/overvolt the Teensy with just the common grounding and 3.3V connections?
http://www.adafruit.com/products/746
I tested the GPS and compass separately with the module powered from the Teensy VIN with the Teensy powered by USB. After I connected both to the Teensy at the same time (powered each from the separate power supply), the Teensy stopped responding. So, the power supply connection must have killed the Teensy.
I get 3.3V from the 2 pins on the Teensy. I do not get [HID 16c0:0478] in the syslog when connecting the Teensy. There was no magic smoke, but the Teensy 3.0 is dead. How did I overcurrent/overvolt the Teensy with just the common grounding and 3.3V connections?