Is it easy to be disturbed when the pins of the microcontroller are left floating?

小太阳yy

Is it easy to be disturbed when the pins of the microcontroller are left floating? [Copy link]

 

If the pins of the microcontroller are left floating when not in use, will they be easily disturbed?

maychang

[Will the microcontroller pins be easily disturbed if they are left floating when not in use?]

Normally, that's the case.

史蒂芬

If the floating pin is an input, there may be noise interference. If it is an output or bidirectional, there should be no interference.

littleshrimp

Floating in input mode can easily cause interference and extra current consumption

bigbat

Usually the default mode of GPIO is output mode. If it is left floating, it should be fine. If it is in input mode, it is hard to say. Therefore, if it is in input mode, pull-up and pull-down resistors should be added, such as: I2C, USART, etc.

wangerxian

It is usually okay to leave the pins floating without initialization, after all, not all pins are used.

led2015

These interference signals may be electromagnetic waves, power supply noise, capacitor charging and discharging processes, etc.

shuangchafeng

Will the pins of the microcontroller be easily disturbed if they are left floating when not in use? Usually, pull-up or pull-down resistors are connected to avoid leaving them floating.

dyjccx

To avoid interference, unused pins are configured as outputs. Special pins that cannot be configured, such as JTAG, are pulled up and down according to normal logic.

saho

Will the pin of the microcontroller be easily disturbed when it is not in use? Usually the input state of this pin is uncertain and easily disturbed by the outside world. Usually a pull-up or pull-down resistor is connected to avoid it being left floating. If there is an internal pull-up or pull-down resistor, it can be set to pull up or pull down internally. In this way, the external hardware circuit can be NC, saving a resistor.

dabiaoke

I think it depends on the application scenario. If it is low voltage and low power, floating will have little effect. If it is a high power application, it is better to configure it to be internally pulled down, which is better than floating without configuration or high impedance state.

BII

Thank you for sharing

lkh747566933

If the pins of the microcontroller are left floating when not in use, they are easily disturbed.

daxuefeng

The floating input in stm32 is very susceptible to external interference. It is recommended to pull up the input or pull down the input, which is more stable.

fjdeepblue

If it is set as output, it can be left floating, but it may increase power consumption. For input state, it needs to be pulled up or down. Some processors have pull-up or pull-down resistors inside.

lanhua

If the pins of the microcontroller are left floating when not in use, will they be easily disturbed?

Set to enter will!