Hi all,
i've been looking for this data but can't find it.. Maybe you can help?
I am using an external (not USB) 5V power supply to power my Teensy 2.0. I am using switches going into digital pins and potentiometers going into analog pins.
Before i turn it on i want to check about the maximum values of current that i can send into the pins of the Teensy 2.0. My breadboard power supply can send a maximum of 2.4A at 5V. Obviously if i have 5V connected to one side of a switch and the other side connected directly to the Teensy, theoretically it could be sending 2.4A into the Teensy which i am sure it won't like. The same goes for potentiometers turned completely clockwise with 5V on the CW pin and ground on the CCW pin.
What should my strategy be for protecting the Teensy from over-current? I'm not using the pull-up resistors on the inputs. Does the microcontroller have other built in resistors on the pins? I can't find anything in the datasheet although i'm sure there is probably something in there about this. I was thinking of just putting some resistors in series between the inputs and the input pins. If so, what would be a safe value for them?
Cheers
NM
i've been looking for this data but can't find it.. Maybe you can help?
I am using an external (not USB) 5V power supply to power my Teensy 2.0. I am using switches going into digital pins and potentiometers going into analog pins.
Before i turn it on i want to check about the maximum values of current that i can send into the pins of the Teensy 2.0. My breadboard power supply can send a maximum of 2.4A at 5V. Obviously if i have 5V connected to one side of a switch and the other side connected directly to the Teensy, theoretically it could be sending 2.4A into the Teensy which i am sure it won't like. The same goes for potentiometers turned completely clockwise with 5V on the CW pin and ground on the CCW pin.
What should my strategy be for protecting the Teensy from over-current? I'm not using the pull-up resistors on the inputs. Does the microcontroller have other built in resistors on the pins? I can't find anything in the datasheet although i'm sure there is probably something in there about this. I was thinking of just putting some resistors in series between the inputs and the input pins. If so, what would be a safe value for them?
Cheers
NM