I killed two Teensies (4.1) . So I ordered another 10. Hope I can receive them quickly.
I use digital pins to control max4533 to generate a signal that switching between +25V and -5V. Those In1 In2 In3 In4 are directly hooked up to Teensy digital output. It runs OK for many hours. And then suddenly I couldn't communicate with the Teensy anymore. At this time I see the Teensy board is drawing a lot of current, >400mA, and the FET Q1 becomes very hot.
I think the only way it can be killed is there is some high voltage shows on the digital pin, although I am not sure why. Should I use some resistor between Teensy output and the digital input of the max4533? Or should I put some Zenner diode for protection?
I use digital pins to control max4533 to generate a signal that switching between +25V and -5V. Those In1 In2 In3 In4 are directly hooked up to Teensy digital output. It runs OK for many hours. And then suddenly I couldn't communicate with the Teensy anymore. At this time I see the Teensy board is drawing a lot of current, >400mA, and the FET Q1 becomes very hot.
I think the only way it can be killed is there is some high voltage shows on the digital pin, although I am not sure why. Should I use some resistor between Teensy output and the digital input of the max4533? Or should I put some Zenner diode for protection?