In circuit design, there are various power symbols that often confuse people. Today, I have compiled 27 of them to share with everyone.The following V represents the meaning of Voltage.1. VCC: C can be understood as the Collector of a transistor or Circuit, referring to the positive terminal of the power supply.2. VDD: D can be understood as the Drain of a MOSFET or Device, referring to the positive terminal of the power supply.3. VEE: E can be understood as the Emitter of a transistor, referring to the negative terminal of the power supply.4. VSS: S can be understood as the Source of a MOSFET, referring to the negative terminal of the power supply.5. VBB: B can be understood as the base of a transistor, generally referring to the positive terminal of the power supply.
The above 5 can all be understood by looking at the diagram below.
6. AVCC, A means Analog, representing analog VCC, generally used for analog devices.7. AVDD, A means Analog, representing analog VDD, generally used for analog devices.8. DVCC, D means Digital, representing digital VCC, generally found in digital circuits.9. DVDD, D means Digital, representing digital VDD, generally found in digital circuits.
The above four, if the circuit or device does not distinguish between analog and digital, then use VCC or VDD.
10. AGND, Analog GND, corresponds to the negative terminal of AVCC or AVDD.11. DGND, Digital GND, corresponds to the negative terminal of DVCC or DVDD.12. PGND, P means Power, referring to Power GND, for example, in DC-DC, there will be a distinction between power ground and signal ground.
The above three are essentially all GND, and the distinction is mainly for PCB routing needs, with some single-point or multi-point grounding treatments to avoid interference.
13. Vpp, sometimes called Vpk, refers to the peak-to-peak voltage, for a sine wave, it is the peak voltage minus the valley voltage, the maximum value minus the minimum value.14. Vrms, rms is short for root mean square, meaning the effective value of Vrms generally refers to AC signals.15. VBAT, BAT is short for battery, generally refers to battery voltage.16. VSYS, SYS is short for system, generally refers to the system power supply of platform solutions (like MTK).17. VCORE, CORE refers to core, generally referring to the core voltage of chips like CPU and GPU.18. VREF, REF means reference voltage, such as the reference voltage inside an ADC.19. PVDD, P means Power, referring to Power VDD.20. CVDD, C also means CORE, referring to core power VDD.21. IOVDD, IO refers to GPIO, meaning the VDD that supplies power to GPIO, used in CAMERA, and is the pull-up power for I2C communication.22. DOVDD, used in CAMERA, supplied externally to the CAMERA, generally also an analog power supply.23. AFVDD, Auto Focus VDD, refers to the power supply for auto focus VDD, used in CAMERA to power the motors.24. VDDQ, used in DDR, where there is a DQ signal, which can be understood as supplying power to these data signals.25. VPP, this VPP is in all caps, used in DDR4, not present in DDR3, referred to as activation voltage, the voltage for turning on the word line.26. VTT, generally VTT=1/2VDDQ, also used in DDR, providing power to some control signals.27. VCCQ, used in NAND flash, such as commonly used storage like eMMC or UFS in mobile phones, generally supplies power to IO.If there are other power symbols, feel free to join the group to add more and learn!