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Power
VCC / VDD
Voltage at the Collector / Voltage at the Drain
Common names for the positive supply rail. Used interchangeably.
How it looks
Real geometry: CORE3588 copper, drawn from our board file (top and bottom layers; this net in amber)
A VCC/VDD rail on CORE3588: PERIPH_3V3, a 3.3 V supply. In the parts' datasheets the pin it feeds is called VDD.
- 1Made here, by a buck converter (U3 and its coil L2).
- 2Used here: the motion sensor's VDD pin (pin 8) sits on this rail.
How it works
Where it fits
VIN comes in (VIN), regulators (LDO, buck converter) make rails, chips eat them. A chip's pins may run on a separate rail (VDDIO).