TM4C129ENCPDT: How to make a 3.3v pulse for I/O pin

Nishitha Chandrasekar

Intellectual 700 points

Part Number: TM4C129ENCPDT

Hi Sir,

I have a doubt, i need to make I/O ports used as a input pin for 3.3v trigger pulse. whether it is possible to do

over 6 years ago

0 Nishitha Chandrasekar over 6 years ago

Intellectual 700 points

What happened when we give 3.3v signal directly connected to I/O ports

0 Genatco over 6 years ago in reply to Nishitha Chandrasekar

Guru 55913 points

Hello,

You must insure the GPIO pin current (forward/reverse) does not exceed datasheet electrical section specifications and is not powered prior to MCU being powered. Even a simple external trigger pulse can easily short MCU rail ESD protection diodes if not handled properly.

0 Nishitha Chandrasekar over 6 years ago in reply to Genatco

Intellectual 700 points

Hi Sir,
My controller GPIO pins can able to sink 18mA and source 12mA

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TM4C129ENCPDT: How to make a 3.3v pulse for I/O pin