射频芯片测试电路设计
1:31
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Project
Schematic
Analyzing floating resistors.
Reviewing USB-C connections.
Confirming component connections.
Assessing R5 for current sensing.
Using Knowledge Base Tool.
Using Schematic Tool.
Using the knowledge tool.
确实，这三只电阻目前是悬空的。我检查了原理图，发现它们还没有被接到目标网络上，所以被 ERC 判定为未连接。
它们各自的设计意图与正确接法如下：
- R2 / R3：这两只标为 5.1 kΩ 的电阻是 USB‑C 受电端（UFP）的 CC 下拉电阻（Rd），用于向源端表明“我是用电设备”。应分别将其一端接到 J1 的 CC1(A5) 与 CC2(B5)，另一端接 GND。当前尚未连到 CC1/CC2，所以显示悬空。
- R5：这只 0.1 Ω 分流电阻是做电流检测用，目标是测 USB 供电电流，应串接在 VBUS 与 LDO 输入之间。应把 J1 的 VBUS1/2/3/4 汇到 R5 的一端，R5 的另一端再接 U1 的 IN。当前没有插入 VBUS 回路，因此悬空。
建议的修复连线
- 将 R2 P1 接 J1:CC1(A5)，P2 接 GND；将 R3 P1 接 J1:CC2(B5)，P2 接 GND（分别标注 CC1、CC2 便于 ERC）。
- 将 R5 串入 VBUS：J1:VBUS1/2/3/4 -> R5:P1 -> R5:P2 -> U1:IN；同时在 R5 两端各放一个测试点做电流/电压测量。若你更想监测 3.3 V 轨电流，也可把 R5 放在 U1:OUT 与 3V3 之间，并做 Kelvin 引线到测试点。
可选细化
- 在 USB D+/D- 近 U3 端各加 22–33 Ω 串联电阻，并在 CC1/CC2、D+/D- 加 ESD 防护器件。
- 给 R5 两端丝印箭头标注电流方向与量测极性，便于实验。
需要我现在把以上三处连线和测试点帮你接好吗？你确定用“VBUS 侧检测”还是“3.3 V 侧检测”，我就按你的选择实施。
把CC电阻接地
确认R5测量位置
改R5阻值封装
增加测试点
加USB-C保护器件
55 days
Plan completed.
Show Plan
J3
U1 OUT - U2 VR_DIG
J1 GND4 - U1 GND
U3
J1 GND4 - U1 GND
U2 DIO0 - J4 1
X2 1 - Y1 GND
X2
R1
Resistance
10kΩ
J2
U1 OUT - U2 VR_DIG
Y1
C4 P2 - J2 2
GND
J1 GND4 - U1 GND
J1 VBUS4 - U1 IN
C2
Capacitance
100nF
U1 OUT - U2 VR_DIG
C4 P2 - J2 2
J1 VBUS4 - U1 IN
J1 GND4 - U1 GND
U2
C3
Capacitance
100nF
C1
Capacitance
100nF
C4
Capacitance
100nF
U1
U4
Reviews
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #powerjharwinbarrozo11.4M
- A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #genericsjharwinbarrozo15.5k
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlinkjharwinbarrozo1.2M
- 10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcanjharwinbarrozo1.2M
- Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlinkjharwinbarrozo1.1M
SX1276 LoRa RF Test Board with USB-C Power, On-board USB-SPI Bridge Control, TCXO Clock, and 915 MHz 50 Ω RF Front-End
Properties
MHz
Pricing & Availability
Distributor | Qty 1 |
|---|---|
Arrow | $14.91–$22.01 |
Digi-Key | $12.31–$16.92 |
LCSC | $20.52 |
Mouser | $19.67 |
TME | $0.29 |
Verical | $12.40–$27.06 |
Assets
Assets are files uploaded to this project which can be used in various ways.
Controls
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