Hello everyone!
I have just been developing a little project and my teensy appears to have died. I am trying to figure out if it is salvageable and what I may have done wrong.
THE MEASUREMENTS ARE PERFORMED WITH THE TEENSY REMOVED FROM MY BOARD AND USING USB POWER AGAIN
Currently, the 3.3v is pulled down (1ohm between 3.3v and ground which then creeps down to .5ohm) I am getting about .175v out of the 3.3v regulator and both the regulator (U4) and MOSFET (Q1) are getting quite hot.
Prior to the failure I was using an external 5v and have cut the USB supply voltage. I was using the 3.3v line to power the 3 74165s as well as the 3.3v for the button switching for those through a 1k resistor to ground. (I don't have a schematic at the moment).
This project has been working fine for the last 5 days the last thing I did before it popped was add one more button via the shift register. I did wire the 3.3v to a button that is connected to the LSB of the 3rd shift register. This singular button was wired to the 3v pin near the Vin and ground for my board. The chips and other buttons were wired to the 3.3v between pin 12 and 24. I can't see why that would matter but thought I would mention it.
My concern is that I am unsure what has popped and why. None of my io changed and nothing connected to the teensy is capable of exceeding 3.3vs.
Apart from too much current draw on the 3.3v line I can't think of anything that might have happened. I also was under the impression that there was overload protection on the 3.3v line.
Any advice would be appreciated. I would like to salvage this board if possible.
I have just been developing a little project and my teensy appears to have died. I am trying to figure out if it is salvageable and what I may have done wrong.
THE MEASUREMENTS ARE PERFORMED WITH THE TEENSY REMOVED FROM MY BOARD AND USING USB POWER AGAIN
Currently, the 3.3v is pulled down (1ohm between 3.3v and ground which then creeps down to .5ohm) I am getting about .175v out of the 3.3v regulator and both the regulator (U4) and MOSFET (Q1) are getting quite hot.
Prior to the failure I was using an external 5v and have cut the USB supply voltage. I was using the 3.3v line to power the 3 74165s as well as the 3.3v for the button switching for those through a 1k resistor to ground. (I don't have a schematic at the moment).
This project has been working fine for the last 5 days the last thing I did before it popped was add one more button via the shift register. I did wire the 3.3v to a button that is connected to the LSB of the 3rd shift register. This singular button was wired to the 3v pin near the Vin and ground for my board. The chips and other buttons were wired to the 3.3v between pin 12 and 24. I can't see why that would matter but thought I would mention it.
My concern is that I am unsure what has popped and why. None of my io changed and nothing connected to the teensy is capable of exceeding 3.3vs.
Apart from too much current draw on the 3.3v line I can't think of anything that might have happened. I also was under the impression that there was overload protection on the 3.3v line.
Any advice would be appreciated. I would like to salvage this board if possible.