Concept of Circuit common sense (6)-differences between VCC, VDD, and VSS labels

What are the differences between VCC, VDD, and VSS in electronic circuits?

I. Explanation

VCC: c = circuit indicates the circuit, that is, the voltage of the access circuit;

VDD: D = device indicates the device's internal operating voltage;

VSS: S = series indicates the public connection, which usually refers to the public grounding terminal voltage of the circuit.

Ii. Description

1. for digital circuits, VCC is the power supply voltage of the circuit, VDD is the operating voltage of the chip (usually VCC> VDD), and VSS is the grounding point. (For example, for an arm single-chip microcomputer circuit, the power supply voltage VCC is generally 5 V. Generally, it is converted into a single-chip microcomputer Working Voltage VDD = 3.3 V through a three-end stabilized block)

2. Some ICS have both VDD pins and VCC pins, indicating that the device itself has a voltage conversion function.

3. In an FET (or coms device), VDD is the drain pole, VSS is the source pole, and VDD and VSS are the component pins, not the power supply voltage.