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do I need decoupling capacitors near U1?
vasy_skral

vasy_skral

@copilot do I need decoupling capacitors near U1?
1y

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
  1. 0.1 µF Decoupling Capacitor for $V_{CCP}$
    • Connect $C1:1$ to $U1:V_{CCP}$
    • Connect $C1:2$ to GND
  2. 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
Do you need additional guidance or clarification on any part of this?
1y
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2
LED2_R
TCA_RST
LED1_G
SDA
TCA_INT
LED2_G
SCL
LED1_R
LED1_G
LED2_B
LED1_B
TCA_RST
LED2_R
LED1_B
LED2_G
SDA
TCA_INT
SCL
SCL
LED1_R
SDA
LED2
+3V3
R26
Resistance
4.7kΩ
+3V3
+3V3
R6
Resistance
60 Ω
+3V3
R1
Resistance
4.7kΩ
+3V3
+3V3
+3V3
R16
Resistance
65 Ω
R8
Resistance
15 Ω
+3V3
R24
Resistance
60 Ω
R11
Resistance
15 Ω
+3V3
+3V3
R14
Resistance
65 Ω
LED1
J1
C1
Capacitance
0.1uF
C2
Capacitance
0.1uF
U1

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IO Expander RGB LEDs

IO Expander RGB LEDs thumbnail
Design of an RGB LED control system using a TCA6424A I/O expander. Features multiple RGB LEDs driven by resistors via an I2C interface. Integrates power supply and reset circuitry. #polygon

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