Contents
Is it safe to leave output pins unconnected?
Output pins are generally safe when unconnected, but it’s a good practice to connect them to pull-up instead of pull-down resistors to minimize idle currents. Having external resistors also means that heat dissipation is evenly distributed instead of concentrated on the microcontroller itself. Some pins are best left unconnected.
What happens if you leave unused pins on a microcontroller?
However, the consequences of doing so can include the unstable operation of the microcontroller in an actual application or, on a serious note, outright damage to the component itself. The effect of unused pins varies as it depends on the types of pins and the potential risks they pose when left unconnected.
What do NC pins mean on a microcontroller?
As for pins that are labeled ‘NC,’ the lack of standardization from the manufacturers means that you should always read the datasheet thoroughly before deciding if they are best left unconnected, or a resistor tied to ground or Vcc is required.
What do you do with unconnected pins on a microcontroller?
The only pins that you should leave unconnected are pins noted to contain internal circuitry for factory testing. They are usually denoted by “IC” and highlighted explicitly on the datasheet.
Which is the best software to terminate unused pins?
With comprehensive PCB design software like Altium Designer ®, terminating the unused pins with resistors is convenient. Altium’s offers all the necessary components and includes additional resources to help optimize your PCB design. If you have more concerns about unused pins, talk to an Altium expert for more tips.
How is routing of common signal to independent I / O set?
The routing of common signal to independent I/O is set by digitally controlling three select lines, which can be set either high or low into one of eight binary combinations. This tutorial covers everything you should need to assemble the Multiplexer Breakout then wire it and integrate it into your project.