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Power
Decoupling cap
Small ceramic capacitor placed next to a chip's power pin to smooth out current spikes.
How it looks
Real image: CORE3588, rendered by KiCad from our board file
A decoupling capacitor on CORE3588, 9 x 6 mm: C34 next to the motion sensor U11. The bigger C35 (2.2 uF) sits beside it on the same rail.
- 1C34, 100 nF: one end on the 3.3 V rail, the other on ground.
- 2U11's VDD pin (pin 8), 1.8 mm away, on the same 3.3 V rail.
Real geometry: CORE3588 copper, drawn from our board file (2D plan view)
The same spot as flat copper: amber is the 3.3 V net; the short amber link is what makes the capacitor useful.
- 1C34's 3.3 V pad.
- 2The sensor's 3.3 V pin: joined to C34 by a short track (amber).
How it works
Where it fits