Medical-Grade PCBA Design

dondon2200

dondon2200

stage 1 "Update the power strategy: Use J2 (USB-A) 5V VBUS as the primary power source. Connect J2 VBUS to the 3.3V LDO input. Power U1 (CYPD3171) and U2 (Retimer) from the 3.3V LDO output. Crucially, configure U1 (CYPD3171) in 'Sink-only' or 'Data-only' mode to ensure the cable never sources power to the monitor at J3."
stage 2 "Route the DisplayPort Main Links from J1 through 0.1uF AC coupling capacitors and common mode chokes to the input of U2 (Retimer). Connect U2 high-speed outputs to J3 (USB-C) TX/RX pairs. Add I2C pull-up resistors (2.2k ohm) and exposed test pads to U2’s SDA/SCL pins so we can manually tune the EQ/Gain settings for the 10ft cable loss."
stage 3 "Place all ESD protection arrays (U3, U4, D1-D5) physically close to connectors J1, J2, and J3. Connect the GND pins of all ICs, connectors, and protection diodes to a common Ground net. Add a 'GND' power portal symbol to the canvas to resolve all 'Missing Power' errors for Ground."
stage 4 "Assign differential pair labels to USB_D_P/N (90 ohm) and DP_Lane_P/N (100 ohm) nets. Group J1 and U2 related components visually on the schematic to represent the High-Speed Video Path. Ensure all component designators (R1, C1, U1...) are unique and assigned."
26 days

flux

1:33

Chat History
Project

Reviewing circuit design steps.

Your goal is to reconfigure power/PD, insert a retimer path, finalize ESD/grounding, and set diff-pair rules within ≤10 mm width.
Plan:
  1. Power/PD: feed LDO from J2 VBUS, power U1 from 3.3 V, set sink/data-only so J3 never sources; adjust CC/VCONN.
  2. High‑speed: add retimer (new designator), AC caps + CMCs J1→retimer; retimer→J3; add 2.2k SDA/SCL pullups + test pads.
  3. ESD/GND: place low-cap arrays near connectors; unify GND via portal.
  4. Constraints: label USB_D_P/N 90 Ω, DP lanes 100 Ω; group J1+retimer; enforce ≤10 mm; ensure unique DNs.
Click Start to run this plan.
26 days

Started implementing a plan

#Goal

- Update the DP 1.4a + USB-A to USB-C ultra‑slim active cable design to (1) modify power/PD behavior so the cable never sources VBUS at J3 and power is provided to CYPD3171 (U1) via a 3.3 V LDO from J2 5 V, (2) insert a DisplayPort retimer in the high‑speed path with AC-coupling capacitors, common‑mode chokes, I2C pullups, and test pads for EQ/Gain tuning, (3) finalize ESD protection positioning and unify grounds for improved system integrity, and (4) define differential pair labels and enforce a trace width of ≤10 mm.

#Implementation plan

1. Power/PD Configuration

1. Route USB-A VBUS from J2 to the input of the 3.3 V LDO (U2).

2. Configure the CYPD3171 (U1) to use the 3.3 V supply from U2's output and set it as sink‑only/data‑only so that J3 never sources power.

3. Adjust the CC termination network and any related VCONN features to reflect the new power strategy.

2. High‑Speed Path Retimer Insertion

1. Add a new retimer IC between J1 (DisplayPort connector) and J3 (USB-C plug), ensuring a new designator is assigned for the retimer.

2. Insert AC‑coupling capacitors (for example, 0.1 µF) and common‑mode chokes on the high‑speed signal path between J1 and the retimer input.

3. Connect the output of the retimer to J3’s high‑speed TX/RX paths.

4. Add 2.2 kΩ I2C pullup resistors and place test pads for EQ/Gain tuning adjustments.

3. ESD Protection and Grounding

1. Finalize ESD protection by positioning low‑capacitance ESD arrays near connectors J1, J2, and J3.

2. Unify all ground nets by creating a central ground portal to ensure consistent grounding throughout the design.

4. Differential Pair and Trace Constraints

1. Label differential pairs: assign USB_D_P/N with a 90 Ω differential impedance and DP lane pairs with 100 Ω differential impedance.

2. Visually group J1 (DisplayPort connector) and the newly added retimer as the High‑Speed Video Path.

3. Enforce layout constraints to ensure the board and all high-speed lanes remain within a ≤10 mm width limit.

4. Verify and update designators to maintain their uniqueness.

#Success criteria

- The design never sources VBUS at J3, and U1 is reliably powered by the 3.3 V LDO (U2).

- A retimer with AC-coupling, common‑mode chokes, and I2C test circuitry is integrated successfully between J1 and J3.

- ESD protection is optimized near connectors and all grounds are unified via a ground portal.

- Differential pairs are correctly labeled with target impedance values, and board width constraints (≤10 mm) are enforced, with unique designators maintained.

26 days

Working on your request...

0:23

PCB Layout
Schematic

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26 days

Completed your request.

1:03

Started: Modifying power nets to stop VBUS sourcing

26 days

Updated properties for 1 object

0:11

Set U1's Role Details to "Configure as UFP sink-only/data-only. Do not source VBUS at J3; VBUS pins used only for detection/monitor per datasheet."

26 days
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J2 2 - U1 DM0/GPIO
J2 1 - U2 IN
U1 VCCD - C3 P1
GND
U1 VCCD - C3 P1
J2 3 - U1 DP0/GPIO
J2 1 - U2 IN
D1
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Inspect

Profound Peach Battle Mech

Profound Peach Battle Mech
Description

Created
1 Contributor(s)
dondon2200

Controls

Properties

System Architecture
flowchart TD subgraph HostSide [Host Side] J1[DisplayPort receptacle J1] J2[USB-A plug J2] end subgraph CablePCBA [Ultra-slim active cable PCBA] U1[CYPD3171 PD controller U1] U2[3.3V LDO U2] ESD_DP[ESD array for DP lanes] ESD_CC[ESD for CC and SBU] ESD_USB2[ESD for USB2 D+ D-] ESD_VBUS[TVS for VBUS] R_RP[Rp pull-ups] C_DEC[Decoupling caps] end subgraph TypeCPlug [USB-C plug J3] J3[USB-C plug J3] end J2 -->|5V VBUS| U2 U2 -->|3.3V| U1 J2 -->|5V VBUS source| J3 U1 -->|CC1 CC2| R_RP R_RP -->|CC1 CC2| J3 U1 -->|VCONN on inactive CC| J3 J1 -->|DP lanes AUX HPD| ESD_DP ESD_DP -->|DP Alt Mode lanes| J3 J2 -->|USB2 D+ D-| ESD_USB2 ESD_USB2 -->|USB2 to TypeC| J3 J3 -->|CC SBU| ESD_CC J3 -->|VBUS| ESD_VBUS C_DEC -->|local decoupling| U1 C_DEC -->|local decoupling| U2

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