GPIO input mode with high impedance state

In this article, let’s understand what precisely this high impedance state is.

A high impedance state is also called a Hi-Z state. It’s nothing but keeping your pin floating by not connecting to high voltage state or the ground as shown in Figure1. So, that’s why this state is also called a floating state.

After you power the MCU, by default, all the GPIO pins will be in input mode with a High-Z state or floating state, and this is true with almost all microcontrollers.

Keeping the pin in a floating state can lead to leakage current, which may result in high power consumption because a floating pin is highly susceptible to picking up the noise and may result in leakage current.

In the following article, let’s see GPIO input mode with pull-up / pull-down state

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