The source current and sink current of the single-chip microcomputer are both for the output of the single-chip microcomputer, and are the concrete embodiment of the driving ability of the single-chip microcomputer.
sink current
As shown in the figure above, when the microcontroller outputs a low level, the circuit is allowed to sink current into the pins of the microcontroller. This current is called "sink current", so that the light-emitting diode is lit, and the circuit where the light-emitting diode is located can be called "sink current load" ".
source current
As shown in the figure above, when the single-chip microcomputer outputs a high level, the circuit is allowed to pull current from the pins of the single-chip microcomputer. This current is called "pulling current", so that the light-emitting diode is lit, and the circuit where the light-emitting diode is located can be called "pulling current load" ".
What is the magnitude of the source current and sink current? This involves the driving ability of the single-chip microcomputer. In the principle and interface of the microcomputer, we know that when evaluating the driving ability of the single-chip microcomputer, we will talk about how many TTLs each pin can drive. Generally speaking, the sink current capability of the microcontroller is greater than the current sink capability, that is, when lighting, the first picture (the microcontroller output low level) is recommended.
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