DCpower generally refers to the source with the actual voltage, the others are the labels (in some simulation software, the default is to connect the label and the source) VDD: power supply voltage (unipolar device); power supply voltage (4000 series digital circuit); Pole voltage (field effect transistor) VCC: power supply voltage (bipolar device); power supply voltage (74 series digital circuit); voice control carrier (VoiceControlledCarrier) VSS: ground or power supply negative VEE: negative voltage supply; FET source ( S) VPP: Program/erase voltage.
First, explainDCpower generally refers to the source with the actual voltage, the others are the labels (in some simulation software, the default is to connect the label and the source) VDD: power supply voltage (unipolar device); power supply voltage (4000 series digital circuit); Pole voltage (field effect transistor) VCC: power supply voltage (bipolar device); power supply voltage (74 series digital circuit); voice control carrier (VoiceControlledCarrier) VSS: ground or power supply negative VEE: negative voltage supply; FET source ( S) VPP: Program/erase voltage.
VCC: C=circuit indicates the meaning of the circuit, that is, the voltage of the access circuit;
VDD: D = device means the meaning of the device, that is, the working voltage inside the device;
VSS: S=series means the meaning of a common connection, usually refers to the common ground voltage of the circuit.
Second, another explanation:Vcc and Vdd are the power terminals of the device.
Vcc is positive for bipolar devices, and Vdd is mostly positive for single-stage devices. The subscript can be understood as the collector C of the NPN transistor and the drain D of the PMOSorNMOS field effect transistor. You can also see Vee and Vss in the circuit diagram, which means the same. Since the mainstream chip structure is silicon NPN, Vcc is usually positive. If VNP is used, the PNP structure is negative. It is important to see the electrical parameters when selecting the chip.
Vcc is derived from the collector supply voltage, CollectorVoltage, which is generally used for bipolar transistors. When the PNP tube is a negative supply voltage, it is sometimes labeled as -Vcc, and the NPN tube is a positive voltage.
Vdd is derived from the drain supply voltage, DrainVoltage, used in MOS transistor circuits, and is generally referred to as a positive supply. Since PMOS transistors are rarely used alone, Vdd is often connected to the source of the PMOS transistor in a CMOS circuit.
Vss source supply voltage, referred to as a negative supply in a CMOS circuit, or zero volt or ground on a single supply.
Vee emitter supply voltage, EmitterVoltage, is generally used for the negative supply voltage of the ECL circuit.
Vbb base supply voltage for common-base circuits of bipolar transistors.
Third, the description1. Generally speaking, VCC=analog power supply, VDD=digital power supply, VSS=digital ground, VEE=negative power supply.
2. Some ICs have both VDD and VCC pins, indicating that the device itself has a voltage conversion function.
3. For digital circuits, VCC is the supply voltage of the circuit, VDD is the operating voltage of the chip (usually Vcc "Vdd"), and VSS is the ground point.
4. In a FET (or COMS device), VDD is the drain, VSS is the source, and VDD and VSS refer to the component pins, not the supply voltage.
Detailed explanation: Some ICs have both VCC and VDD. This device has a voltage conversion function. In the "field effect" or COMS component, VDD is the drain pin of CMOS, VSS is the source pin of CMOS, this is the component pin symbol, it has no "VCC" name, your question contains 3 symbols , VCC / VDD / VSS, this is obviously the circuit symbol in addition to the correct grounding design, installation, but also the correct grounding of various signals.
In the control system, there are roughly the following ground lines:
(1) Digital ground: Also called logical ground, it is the zero potential of various switching (digital) signals.
(2) Analog ground: It is the zero potential of various analog signals.
(3) Signal ground: Usually the ground of the sensor.
(4) AC ground: The ground wire of the AC power supply, which is usually the ground where noise is generated.
(5) DC ground: the ground of the DC power supply.
(6) Shielding ground: also called the chassis ground, designed to prevent static induction and magnetic field induction.
These ground wire treatments are an important issue in system design, installation, and commissioning.
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