Schematic for IO Expander RGB LEDs: Design of an RGB LED control...

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do I need decoupling capacitors near U1?

vasy_skral

@copilot do I need decoupling capacitors near U1?

copilot

Yes, you should definitely have decoupling capacitors near U1 for stable operation. Decoupling capacitors help filter out high-frequency noise that can cause erratic behavior in ICs. Typically, you'd place a 0.1 µF ceramic capacitor close to the power supply pins ($V_{CCP}$ and $V_{CCI}$ in your case).

Here's how you can connect them:

Connections

0.1 µF Decoupling Capacitor for $V_{CCP}$
- Connect $C1:1$ to $U1:V_{CCP}$
- Connect $C1:2$ to GND
0.1 µF Decoupling Capacitor for $V_{CCI}$
- Connect $C2:1$ to $U1:V_{CCI}$
- Connect $C2:2$ to GND

Suggested Designators (assuming C1 and C2 for capacitors)

C1: 0.1 µF Ceramic Capacitor
C2: 0.1 µF Ceramic Capacitor

Full Net Connections:

Connect $C1:1$ to $U1:V_{CCP}$
Connect $C1:2$ to GND
Connect $C2:1$ to $U1:V_{CCI}$
Connect $C2:2$ to GND

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