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USB-C PD Sniffer for Logic Analyzer

mschwingen·hardware·USB-PD-Sniffer/USB-PD-Sniffer_V1.kicad_pcb

USB-C PD Sniffer for Logic Analyzer PCB layout, top view — open source AVR/Arduino board by mschwingen

About the USB-C PD Sniffer for Logic Analyzer PCB

USB-C PD Sniffer for Logic Analyzer is an open source AVR/Arduino PCB design by mschwingen, published on GitHub. It is a 2-layer board measuring 23 × 26 mm, with 17 components from 14 distinct parts.

Its main chip is the ATMEGA32U4-MU, from the AVR/Arduino family. By type, the board carries 8 resistors, 4 connectors, 2 diodes, 2 capacitors and 1 IC.

It belongs with the power & battery and test & measurement designs in this gallery.

From the project

Hardware designs by Michael Schwingen, michael at schwingen dot org

When debugging USB power delivery problems, a deep look into what is happening on the CC signals on the wire is helpful. Fortunately, the sigrok/pulseview software that works with many cheap USB logic analyzers has decoders for the USB PD protocol.

However, the logic "1" voltage on the CC lines during the PD handshake is only in the order of 1V - too low for most logic analyzers.

USB-C PD Sniffer for Logic Analyzer, from the project README
From the project README

Main components on the USB-C PD Sniffer for Logic Analyzer

ATMEGA32U4-MU

USB-C PD Sniffer for Logic Analyzer bill of materials (BOM)

17 components, 14 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA32U4-MU
LM393
U1
1
CONN_01X16
Conn_01x02_Pin
J1
1
CONN_01X12
Conn_01x04_Pin
J2
1
CONN_01X05_MALE
USB_C_Receptacle_USB2.0_16P
J3
1
USB_C_Receptacle_USB2.0_16P
J4
1
SM6T6V8A
D1
1
LED
D2
2
22PF
100nF
C1, C2
1
82k
R1
2
470
R2, R4
1
18k
R3
1
1k
R5
2
10k
R6, R7
1
47K
10k
R8

USB-C PD Sniffer for Logic Analyzer design files

The KiCad project lives in the mschwingen/hardware repository on GitHub; these links point at the commit this page was built from.

USB-C PD Sniffer for Logic Analyzer: common questions

What microcontroller does the USB-C PD Sniffer for Logic Analyzer use?

The USB-C PD Sniffer for Logic Analyzer is built around the ATMEGA32U4-MU, from the AVR/Arduino family.

How big is the USB-C PD Sniffer for Logic Analyzer PCB?

The USB-C PD Sniffer for Logic Analyzer measures 23 × 26 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the USB-C PD Sniffer for Logic Analyzer?

17 components, from 14 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the USB-C PD Sniffer for Logic Analyzer design files?

From the mschwingen/hardware repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the USB-C PD Sniffer for Logic Analyzer design in my own project?

The repository has no license, so all rights stay with mschwingen. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the USB-C PD Sniffer for Logic Analyzer without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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