PCB Design Assistance

flux

1:11

아래 표는 W5500(IC32) 주변 전원핀 디커플링 커패시터까지의 2D 거리(mm) 계산 결과입니다. 가이드라인인 “1 mm 이내”와 비교하였습니다.

Table

커패시터위치 (X,Y) mmIC32 위치 (8, 0) mmΔX (mm)ΔY (mm)거리 (mm)권장 여부 (≤ 1 mm)
C11(8.963, –1.761)(8, 0)+0.963–1.7612.00×
C34(0.8, 0)(8, 0)–7.200.007.20×
C28(17, –11)(8, 0)+9.00–11.0014.21×
C47(0.8, 8.3)(8, 0)–7.20+8.3010.99×
C59(0.8, 4)(8, 0)–7.20+4.008.24×
C18(18.174, 3.137)(8, 0)+10.174+3.13710.65×
C68(17, –6.8)(8, 0)+9.00–6.8011.28×
C11(8.963, –1.761)(8, 0)+0.963–1.7612.00×
결론:
  • 모든 디커플링 캐패시터가 IC32 전원 핀에 1 mm 이하로 가까이 배치되지 않았습니다.
  • 특히 C11(≈2 mm)이 가장 가깝지만, 권장 ≤ 1 mm를 크게 벗어나 있습니다.
  • 나머지 캐패시터는 7 mm 이상 떨어져 있어, 디커플링 성능(ESL/ESR 저감 및 전기적 안정성)에 악영향을 줄 수 있습니다.
회로 무결성을 위해:
  • 각 전원 핀(C34, AVDD, VDD 등)에 인접 디커플링을 0.5 ~ 1 mm 이내로 재배치하세요.
  • IC32 주변에 최소 두 개 이상의 고주파/저주파 병렬 디커플링을 핀 바로 옆에 근접 배치해 EMI/전압 강하를 억제해야 합니다.
  • DRC에서 “missing decoupling_caps” 경고가 없는지 다시 확인하고, 필요 시 Auto-Layout 규칙으로 “1 mm 이내” 규칙을 추가하세요.
DRC 규칙 추가
C11 위치 조정
자동배치 활용
병렬 디커플링 추가
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M1
R52
Resistance
10kΩ
R31
Resistance
10kΩ
R71
Resistance
10kΩ
R73
Resistance
10kΩ
R62
Resistance
33 Ω
R21
Resistance
33 Ω
R26
Resistance
10kΩ
R27
Resistance
10kΩ
R69
Resistance
33 Ω
R6
Resistance
49.9 Ω
R53
Resistance
33 Ω
R2
Resistance
49.9 Ω
R23
Resistance
300 Ω
R9
Resistance
300 Ω
R60
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10kΩ
R1
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49.9 Ω
R7
Resistance
49.9 Ω
R64
Resistance
0 Ω
R66
Resistance
1MΩ
R9
Resistance
49.9 Ω
R29
Resistance
10kΩ
PMODE0
RX
ACTLED
RX
SC
TX_N
EXRES1
TX_P
PMODE1
MOSI
PMODE2
3V3
MISO
SC
1V2O
SCK
RX_P
TOCAP
RX_N
LINKLED
ACTLED
TX
RX_N
TX
3V3
3V3
INT
RST
RX_P
MOSI
TX_P
TX_N
LINKLED
SCK
MISO
C3
Capacitance
6.8nF
C11
Capacitance
0.1uF
C1
Capacitance
22nF
C28
Capacitance
0.1uF
C18
Capacitance
0.1uF
C59
Capacitance
10uF
Voltage
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C34
Capacitance
0.1uF
C83
Capacitance
18pF
C4
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C77
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C39
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C68
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C2
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C81
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4.7uF
C5
Capacitance
1nF
Voltage
2kV
C47
Capacitance
0.1uF
IC32
J1
Y81
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WIZ550 board

WIZ550 board thumbnail
Simple Ethernet board used WIZ550 with real MAC address and configures the network setting automatically.

Properties

192.168.1.2

docs.wiznet.io/Product/ioModule/wiz550io/#overview

Pricing & Availability

Distributor

Qty 1

Digi-Key

$5.85–$7.83

LCSC

$4.78

Mouser

$8.78

Controls