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KiCad Advanced: Design a smart USB thumb drive

Name: KiCad Advanced: Design a smart USB thumb drive
Rating: 4.6 (22 reviews)

Design a 4-layer USB thumb drive with BGA routing, eMMC length matching, impedance control, and power path management.

Role Play

Created byDr. Peter Dalmaris

Last updated 6/2026

English

English [Auto],

What you'll learn

Route a 153-ball TFBGA eMMC chip using via-in-pad and dogbone escape techniques on a 0.5 mm ball pitch.
Control differential impedance for USB signal pairs and verify trace geometry using an impedance calculator.
Match eMMC data bus trace lengths to within ±3 mm using KiCad's interactive length tuning tool and Net Inspector.
Design a dual ideal diode OR-ing power path using the LM66100 for seamless, efficient dual-port power management.
Create scoped KiCad DRC exceptions to document intentional design decisions without hiding genuine errors.
Produce a complete, DRC-clean 4-layer PCB layout within the physical constraints of a USB thumb drive form factor.

Course content

8 sections • 84 lectures • 26h 2m total length

1.010 What This Course Is About8:48
1.020 The Design Challenges9:38
Explore five design challenges in a smart USB thumb drive — BGA packaging with via-in-pad, USB signal integrity, eMMC timing, power-path management with LM66100, and two-layer constraints.
1.030 Bill of Materials Walkthrough30:17
1.040 Tools & Setup8:08
Start with KiCad 10 release candidate, learn version differences and upgrade paths, and set up a new project, adjust preferences, and configure the 50 mil grid for schematic design.

2.010 Schematic Best Practices for Complex Designs13:14
Employ hierarchical sheets with clear label types and descriptive net names, and use power flags, annotation, and documentation to prevent downstream errors.
2.020a Power Architecture: Dual Ideal Diode OR-ing Part A8:22
Explore dual USB-C power architecture using power-o-ring with ideal diodes. Understand why Schottky diodes fall short and how the LM66100 enables low-loss reverse-current protection on a compact 5-volt rail.
2.020b Power Architecture: Dual Ideal Diode OR-ing Part B18:47
2.030 Schematic - Sheet Structure & Netclasses7:26
This KiCad advanced lecture introduces starting a schematic in KiCad 10, organizing with a root sheet and power subsheets, and setting up net classes and a datasheets directory.
2.031 Schematic - Power: OR-ing17:30
Explains implementing an OR-ing power design in KiCad 10 using LM66100 ideal diodes, voltage dividers, and hierarchical nets to detect powered USB ports via an RP2040 and route 5V safely.
2.032 Schematic - Power: Buck Converter15:19
Explain the buck converter power stage for a smart USB thumb drive using the ADC variant and LM2734X to generate 3.3V, with key components and protection.
2.040a USB 2.0 Signal Integrity Fundamentals Part 117:31
Explore USB 2.0 signal integrity fundamentals, including differential signaling, 90 ohms impedance, rise times, transmission line behavior, and managing discontinuities to prevent reflections.
2.040b USB 2.0 Signal Integrity Fundamentals Part 223:48
Explore how common mode noise, ESD protection, and eye diagram govern USB 2.0 signal integrity for high-speed 480 Mbps and full-speed 12 Mbps paths, with practical KiCad layout rules.
2.050a Schematic — Storage USB & ESD Protection Part 118:14
Explore wiring USB-C receptacles for a KiCad schematic, including CC pull-downs, shield RC network for EMI and ground loops, and integrating a USB2244 bridge for eMMC storage.
2.050b Schematic — Storage USB & ESD Protection Part 214:32
2.051 Schematic - RP2040 USB and ESD Protection15:43
Copy the USB storage circuitry to the RP2040 sheet, add a TVS diode array and 27.4 ohm resistors, and route the D+ and D- for USB protection.
2.060a eMMC Interface: How It Works Part 122:06
Explore the eMMC bus fundamentals and voltage rails, detailing clock, cmd, dat signals, 1-, 4-, and 8-bit mode switching via CMD6, CRC enforcement, and USB 2244 implications.
2.060b eMMC Interface: How It Works Part 218:29
Analyze 0.5 mm tf-bga-153 eMMC layout, via-in-pad with epoxy fill per ipc4761 type 7, 3.3 v vcc/vccq rails, vddi bypass, decoupling, and rstn/ecsd enablement.
2.070 Schematic - eMMC and Power Decoupling29:43
2.080 Schematic - RP2040 Core and Supporting Circuits14:02
Adapt the RP2040 core schematic in KiCad using the Raspberry Pi minimal design, wiring USB D plus and D minus, clocks, GPIOs, and planning I2C, SPI, SWD, and power connections.
2.085 Schematic - Add TVS Diode Protection Array for the USB Ports12:26
Place and label a TVS diode protection array for the CC pins in a KiCad schematic, then define net classes for power, VBUS, USB diff pairs.
2.090 Schematic Review and ERC5:36
2.092 Schematic - Implement the INA230 Sensor13:22
Implement INA226 current, voltage, and power monitors in KiCad to measure USB bus power, using shunt resistors on VBUS storage and VBUS MCU, and integrate with RP2040 via I2C.
2.095 Schematic Implement RP2040 Breakouts9:37
2.097 Schematic - Implemenet OLED3:16
Connect the 128×32 oled display (SSD1306) to the RP2040 via I2C using a standard 1.27 pitch header. Wire VCC, ground, SCL, and SDA, then link OLED1306 library and run annotator.
2.100 Schematic Milestone Review20:15
During a schematic milestone review, this KiCad advanced lecture runs ERC, identifies I2C bus labeling issues and missing hierarchical labels, and demonstrates planned fixes.
2.110 Schematic ERC11:13
Add test points for vbus and eMMC, and place mounting holes to prepare for the prototype. Validate footprints, use net ties, and annotate designators (X100) before moving to layout.
Defending Your Design Decision: Monitoring Subsystem Go or No-Go

3.005 PCB Stackup and Layer Strategy Primer16:32
Define the printed circuit board stack-up before routing to control impedance and return paths, using an even number of layers with a solid ground plane.
3.010 PCB Stackup and Layer Strategy on 2-Layer Boards13:18
Explore the two-layer PCB stackup, return current behavior, and impedance control, and learn why this design shifts to a four-layer stackup for better ground integrity, routing feasibility, and USB/EMC considerations.
3.015 PCB Stackup and Layer Strategy on 4-Layer Boards17:46
Discover four-layer pcb SGPS stack-up, placing a solid ground plane under the top signal layer to reduce loop area and EMI, enable controlled impedance, and reliable power distribution.
3.020 Impedance Control: Theory and Math - Part 124:04
Explore impedance control fundamentals for high-speed pcb layout, including microstrip and stripline structures, Wheeler's equation, and achieving 90 ohm differential impedance for usb 2.0.
3.025 Impedance Control: Theory and Math - Part 223:08
Explain how trace width, substrate height, copper thickness, and dielectric constant set impedance, and apply a simplified formula to design 50 ohm single-ended and 90 ohm USB 2.0 lines.
3.040 Layout editor setup and basic configuration14:39
Learn to configure KiCad 10 for high-density boards by setting precise grid and a four-layer stack up, enabling BGA escape routing with impedance control and interactive router modes.
3.050 Board outline and import components5:33
Import the netlist and footprints, fix missing footprints, then re-import to ensure zero errors; draft a 77.8 by 39.55 mm two-layer edge-cut outline and place components for optimal routing.
3.060 Impedance and stack-up calculations14:26
3.062 Impedance and stack-up calculations in KiCad15:32
Use KiCad's microstrip and coupled microstrip calculators to compare a 50-ohm single-ended trace and a 90-ohm differential pair with NextPCB results, highlighting tightly coupled USB layout guidance.
3.065 Impedance and stack-up calculations in the Tech Explorations calculator6:23
Explore impedance and stack-up calculations using the Tech Explorations calculator for microstrip and differential pair on a 4-layer PCB, comparing mils and millimeters and validating results against other calculators.
3.067 A new impedance calculation5:34
Compare 90-ohm differential impedance from NextPCB and KiCad calculators for usb d-plus and d-minus traces, seed with five mils, and choose stack-up two while updating KiCad.
3.070 Design rules and net classes configuration18:33
Configure constraints and net classes in KiCad, align USB differential pair width and gap to 90 ohms, and reconcile NextPCB and KiCad impedance results; update stackup for manufacturing capabilities.
3.080 Component placement strategy17:29
3.082a Component placement23:25
3.082b Component placement18:54
Place and optimize power delivery components for a USB-C design, focusing on ideal and protection diodes, buck regulator, USB bridge, and VDD5V connections.
3.082c Component placement39:05
Master advanced KiCad techniques for precise component placement in the smart USB thumb drive design, focusing on efficient layout and practical placement strategies.
3.082d Component placement40:12
Explore advanced KiCad techniques to design a smart USB thumb drive, focusing on precise component placement and board layout considerations.
3.085 Component placement review31:02
3.090 Layout routing strategy9:38
Recommending a Stackup: Making the Case to Move from 2 to 4 Layers

4.010a BGA packages challenges and solutions24:26
Explore ball grid array fundamentals, including pitch and ball count, and master escape routing with dogbone fanout, via-in-pad, and hybrid strategies for high-density BGA designs in KiCad.
4.010b BGA packages challenges and solutions15:52
Learn how vip veering under bga pads enables 0.5 mm pitch bga escape routing, with type 7 filled and capped veers, ipc 4761 guidelines, and reliability considerations.
4.015 Copper pours6:44
Select the first stackup, with signal on top, inner ground and power, for routing and length matching the eMMC data bus, while planning 3.3V and 1.1V/Vbus islands.
4.020a eMMC via in pads4:59
Learn via-in-pad techniques for BGA escape routes by designing custom via sizes and DRC rules for the VGA U601. Place vias under BGA pads to route the data bus.
4.020b eMMC start routing of the data bus46:04
4.030 eMMC length matching of the data bus tracks20:11
Learn length matching of the eMMC data bus between the eMMC chip and the USB 2244, targeting 30 mm total with ±3 mm data and ±5 mm clock.
4.050 Signal length matching theory12:19
Explore signal length matching theory for high-speed eMMC buses, learn how timing skew affects setup and hold margins, and apply time-domain tuning and via-in-pad to improve signal integrity.
Debating a Cost Decision: Justifying Via-in-Pad for the eMMC BGA Fanout

5.010 USB 2.0 routing rules15:23
Master usb 2.0 routing rules to achieve 90 ohm differential impedance, proper trace spacing and length, and emi control with vias, 45-degree bends, and common mode chokes for compliance.
5.020 Layout route USB differential pairs18:54
Route USB differential pairs in KiCad with impedance checks and symmetry. Achieve length-matched traces from the USB port through an ESD array to the RP2040, using vias and manual routing.
5.030 KiCad-ESD and USB layout verification6:54
5.040 KiCad-Power fills46:33
Master KiCad power fills in advanced board design, applying power plane techniques to a smart USB thumb drive project.
5.050a Review and refactoring of eMMC routing PART 122:28
Refactor the eMMC data bus routing to fix vs asymmetry, standardize via sizes, and improve reference planes, then streamline the USB/eMMC layout and decoupling placement.
5.050b Review and refactoring of eMMC routing PART 227:07
5.050c Review and refactoring of eMMC routing PART 335:01
Review and refactor the eMMC routing in KiCad for a smart USB thumb drive, part 3.
5.060 Power distribution and remaining eMMC tracks38:19
Master power distribution and remaining eMMC tracks to design a smart usb thumb drive in a KiCad advanced workflow.
5.070 RP2040 continue routing25:56
5.080 RP2040 route SWD and Boot11:27
Defending Your Routing Approach: USB Differential Pair Sign-off Discussion

6.005-How To Route I2C Explainer13:34
6.010-Route I2C for onboard bevices27:21
6.020 Routing Remaining Signals - GPIOs32:54
Master KiCad advanced routing to connect the remaining signals and GPIOs for a smart USB thumb drive design, focusing on GPIO routing and signal integrity.
06.025 Review routing before DRC (add stiching vias to GND zones)11:18
06.030 Re-route protection diode arrays21:25
Re-route the protection diode array to be as close as possible to the USB cc1 and cc2 source pads, remove unused diodes, and redraw for symmetry and differential pair integrity.
06.035 Route current sensors and other remaining nets35:33
Route current sensors and remaining nets in KiCad advanced design of a smart USB thumb drive, teaching precise net routing for reliable power and data paths.
6.040 I2C pull-ups and improvements16:35
Add reliable I2C pull-ups on a KiCad advanced board by installing 4.7k resistors for SDA and SCL near the RP2040, noting internal pull-ups limits and optional unpopulated pull-up pads.
6.050 Repair Vccq_eMMC net5:23
Diagnose and fix a misconnected VCCQ eMMC net by tying it to the 3.3-volt rail, streamline the layout, and plan ground pour improvements in inner copper layers.
6.060 Improve GND fill geometry25:42
6.070 More via-in-pads22:22
learn to convert pads to via end pads to reduce loop area and inductance by direct connection to ground or 3.3 v planes, while considering solder wicking and manufacturability.
6.075 Silkscreen32:31
Explore silkscreen in KiCad for a smart USB thumb drive, as part of the KiCad Advanced course focused on silkscreen design.
6.080a DRC Part 117:09
Perform a KiCad design rules check for a smart USB thumb drive, addressing ground connections, pad numbering, solder mask overlaps, and via constraints.
6.080b DRC Part 221:40
Address drc and clearance violations in KiCad by rerouting, via management, and applying custom rules for bga u601/u502 and 0402 pads to enforce 0.15 mm and 0.1 mm clearances.
6.080c DRC Part 317:09
Explore drc in KiCad 10 pcb editor, implementing courtyard-based rules to detect via-in-pad and enforce annular width for U601, U402, and other components.
6.080d DRC Part 418:31
Fix design rules for via-in-pad and annular width on U601, close the courtyard. Export gerbers, run manufacturing checks with NextPCBase, and prepare the BOM for fabrication and ordering.
Presenting a DRC Triage: Recommending Which Violations to Fix or Waive

7.010a PCB Fabrication primer Part 119:23
Walk through the pcb fabrication process from copper clad laminate to a finished board, outlining photoresist, etching, drilling, plating, solder mask, silkscreen, and finishes.
7.010b PCB Fabrication primer Part 220:32
Prepare fabrication-ready PCB files in KiCad, including RS274X Gerber files for each layer, Exelon drill file, and fabrication notes, then verify with a Gerber viewer before placing the order.
7.020 Generate Gerber files3:43
Export Gerber and drill files for manufacturing, review edge cuts, copper, paste, mask, and silkscreen layers, and perform design for manufacturing checks before sending to production.
7.030 Design for Manufacturing testing with HQDFM21:06
Utilize HQDFM with NextPCB to validate KiCad gerber files, run DFM and PCB A analysis, and export a detailed report for manufacturing readiness.
7.040 BOM & BOMExplorer34:34
Explore bill of materials workflows in KiCad using BOMExplorer as you design a smart USB thumb drive, mastering BOM generation, management, and analysis.
07.050 Order for PCB and assembly14:58
Handling DFM Violations: Recommending Whether to Proceed with the Fabrication Order

Requirements

Basic KiCad experience is required. You should be comfortable with schematic entry, footprint assignment, and simple PCB routing.
No prior experience with BGA components, high-speed interfaces, or multi-layer boards is needed; this course covers all of it.
A computer capable of running KiCad (Windows, macOS, or Linux). No hardware purchases required.
The free NextPCB DFM Tool is used for impedance calculations. A Windows machine or VM is helpful but not essential.

Description

This course takes you beyond beginner PCB design and into the techniques that professional electronics engineers use every day.

You'll design a complete, manufacturable Smart USB Thumb Drive, a 4-layer board built around the RP2040 microcontroller, a USB2244 bridge IC, and a 64 GB eMMC chip in a 153-ball TFBGA package. Every major design challenge in this project maps directly to a skill used in professional high-speed PCB design.

What you'll work through:

BGA escape routing. The eMMC chip has 153 solder balls on a 0.5 mm pitch. You can't route it like a normal component. You'll learn via-in-pad technique, dogbone escapes, and how to create scoped DRC exceptions in KiCad that document intentional design decisions rather than hiding them.

USB signal integrity. USB 2.0 uses differential signalling with a 90-ohm impedance target. You'll learn how trace width, gap, and layer stackup combine to control impedance, how to verify your geometry with a calculator, and how to route differential pairs correctly in KiCad.

eMMC length matching. A parallel data bus only works reliably if all signals arrive within a tight timing window. You'll use KiCad's interactive length tuning tool and the Net Inspector to match eight data lines to within ±3 mm and the clock to within ±5 mm.

Power path management. The board accepts power from two USB ports simultaneously. You'll implement a dual ideal diode OR-ing circuit using the LM66100 — achieving near-zero voltage drop with no reverse current flow, following the recommended application topology from the datasheet.

4-layer constrained layout. Working within a USB thumb drive form factor forces every routing decision to be deliberate. You'll learn how to assign signals, power, and ground to a 4-layer stackup, manage return current paths, and make engineering trade-offs under real physical constraints.

Who this course is for: You should already be comfortable with KiCad (schematic entry, footprint assignment, and basic routing). No prior experience with BGA, high-speed interfaces, or multi-layer boards is required. If you've completed a foundational KiCad course and want to work on something that genuinely challenges you, this is the next step.

What you'll produce: A complete, DRC-clean, 4-layer KiCad project ready for fabrication, including manufacturing outputs, impedance documentation, and a full set of design files you can use as a reference for future high-speed projects.

Who this course is for:

KiCad users who have completed a foundational PCB design course and want to tackle a professionally challenging project.
Electronics hobbyists and engineers ready to move into BGA routing, high-speed interfaces, and multi-layer design.
Designers who want practical, hands-on experience with the techniques used in professional high-speed PCB design.

KiCad Advanced: Design a smart USB thumb drive

What you'll learn

Explore related topics

Course content

Module 1: Introduction &amp; Project Overview4 lectures • 57min

Module 2: Schematic Design23 lectures • 5hr 31min

Module 3: PCB Layout Foundations20 lectures • 5hr 55min

Module 4: BGA Routing & Via-in-Pad Techniques8 lectures • 2hr 11min

Module 5: USB Differential Pair & Signal Integrity Routing11 lectures • 4hr 8min

Module 6: Remeaining routes16 lectures • 5hr 19min

Module 7: Manufacturing Outputs & Fabrication7 lectures • 1hr 54min

Course debrief1 lecture • 8min

Requirements

Description

Who this course is for: