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Beagle I2C/SPI Protocol Analyzer


Part Number: TP320121

Availability: In-Stock

Non-intrusive bus monitor for embedded engineers working on I2C- or SPI-based products.

Receive 15% off any cable and 20% off any board with purchase of select devices. Discount applied at checkout.

The versatile Beagle™ I2C/SPI Protocol Analyzer is the ideal tool for the embedded engineer who is developing an I2C, SPI, or MDIO based product. The Beagle analyzer provides a high performance bus monitoring solution in a small, portable package. Perfect for engineers in the field and in the lab.

Not sure which product is right for your needs? The Product Selector Guide provides a brief summary table of key features for our I2C/SPI Total Phase products.

Detailed technical information about the Beagle I2C/SPI Protocol Analyzer can be found in the User Manual.

We also have a Quick Start Guide to help you get started.

  • Non-intrusively monitor I2C up to 4 MHz
  • Non-intrusively monitor SPI up to 24 MHz
  • Non-intrusively monitor MDIO up to 2.5 MHz (Clause 22 and Clause 45)
  • Real-Time Data Capture and Display - Watch I2C, and SPI packets as they occur on the bus.
  • Bit-level timing down to 20 ns resolution.
  • Fully Windows, Linux, and Mac OS X compatible
  • Includes full function monitoring tools
  • Low Cost

Actual SPI capture performance is dependent on CPU speed and SPI bus throughput. 24 MHz SPI capture has been tested for typical applications (e.g., captures of a few hundred SPI packets). Depending on user configuration, the maximum achievable capture throughput for continuous streaming applications may be less than 24 MHz.

MDIO monitoring is available in the current versions of the API and version 2.20 of Data Center, which can be downloaded from the Data Center Product Downloads section.

What is Included
Non-intrusive capture I2C, SPI, and MDIO data

The Beagle analyzer has high-impedance inputs so it will not affect the system under test and distort the results. Simply attach the Beagle I2C/SPI analyzer inline to passively capture the data traffic to the target devices.

Nearly Limitless Capture

Captured data is streamed via High-Speed USB directly to your computer. The amount of data captured is limited only by the amount of physical memory that is available on the machine.

Bit-Level timing

Not only can you get timings for an entire packet, it is also possible to get timing for each individual bit in the packet. The Beagle analyzer can return bit-level timing down to a 20 ns resolution.

High-Speed USB 2.0

The Beagle monitor is a bus-powered, High-Speed USB 2.0 device. This provides two major benefits. As a high speed device, all the data captured by the Beagle monitor are transferred to the test computer at 480 Mbps. As a bus-powered device, the Beagle monitor does not require a power adapter. This makes the Beagle monitor the ideal tool for engineers in the field. Just plug it into a High-Speed USB 2.0 port on your laptop and you are ready to go.

Low Cost

No Hidden Fees

The Beagle I2C/SPIProtocol Analyzer comes complete with software for only $395 in single unit quantities. Additional discounts are available for larger volumes.

The low cost makes it affordable for a company to provide every developer with their own analyzer. The benefits of every developer having their own analyzer are:

  • Less time wasted because developers do not have to share analyzers or go to the lab to debug simple problems.
  • Less wasted time means higher productivity because developers can identify and fix problems quickly and easily with less down-time.
  • Higher productivity means shorter development cycles. Projects get done on time and on budget.

By saving just a few hours of engineering time, the Beagle I2C/SPI analyzer will have paid for itself.


The Beagle monitor is completely field-upgradable via USB. Total Phase is committed to improving the Beagle analyzer and making these improvements available to our customers.

You will never have to worry about being out of step with the latest software features. Eligible Software and firmware upgrades are always freely available in the Downloads section of this website.

General Requirements
Available Software  Required Software
TP201110: Data Center Software      TP207010: USB Drivers - Windows   
TP202110: Beagle LabVIEW Driver    TP207210: USB Drivers - Linux
TP200210: Beagle Software API Mac OS X (no drivers required)



PC Requirements & Supported Operating Systems (32-bit and 64-bit)
•    Windows: 7, 8, 8.1, 10
•    Linux: Red Hat, SuSE, Ubuntu, Fedora
•    Mac OS X: 10.7-10.14

Minimum Hardware requirements
•    Intel or AMD processor operating at 2 gigahertz (GHz) or faster
•    1 gigabyte (GB) physical RAM (32-bit) or 2 GB RAM (64-bit)
•    2 GB or more available hard disk space
•    High-speed USB port
•    VGA capable of 1024x768 or higher screen resolution
•    Internet access is helpful

Beagle Protocol Analyzer User Manual
Beagle I2C/SPI Protocol Analyzer Quick Start Guide

Related Products


Beagle I2C/SPI Protocol Analyzer
Completely lived up to my expectations, just plug it in, install the software, and go. Data Center was intuitive and easy to configure, and I was into debugging my I2C issues within 10 minutes of opening the box.
Anurag R.
Does a good job in parsing I2c packets
Does a good job in parsing I2c packets, however sometimes I see it fails to properly parse the most significant nibble of a byte. And for some reason, it keeps picking up some glitches as a start condition.
Got it
Got it
Michael L.
Worked well
Intuitive interface, was able to quickly find what I needed.
Mark S.
Works perfectly
What more is there to say. It works out of the box. Small, compact, no need to carry around a scope.
shawn m.
fast and easy to use
Took my new engineers less than 5 min to start capturing data - great tool for I2C or IPMI busses.
Stefan A.
works out of the box
Was able to verify my writes from host processor to I²C camera, affordable price, easy to use.
Deanna D.
Great Support
The factory personnel gave great support and help
Glenn V.
A nice I2C Analyzer
What I like about this I2C analyzer is that it detects errors and it shows the data for each packet. In my situation, I had nothing but good packets. What I was looking for was bad data. I had an I2C analog to digital chip sending out bogus data intermittently. The input was zero volts and ever so often it would send out a value that was not zero. You need an I2C analyzer to see what the actual value was in order to verify you had the error. I bought the accessory cables that go with the unit. I bought both the pin version and the hook version of the cables needed to interface with the unit. The extra cost was insignificant to the cost of the issue I had which was stopping our production line. The cables were well marked with their function names on the wires (GND, SCK, SD). There were two wires marked ground; I hooked up both to my return line. Once I started gathering data, it was easy to filter through the data looking for my error. The software was very helpful in filtering out data on the bus that was not for the address I was looking at. It also showed packet errors on my system (for which there were none in my case). The analyzer cleaved out all the things that weren't wrong and led me to the what was wrong. In all the analyzer and software combination was what I needed. You can buy of course O-scopes with this kind of feature, but you'd pay about $10K for it. This was quick and easy to use and was only $518.00 (including cables). To me, it was worth every penny as it solved my problem without breaking my wallet. The software was very intuitive as I did not spend a lot of time going through the manual on how to use this analyzer. I am sure could have done a better job of filtering the data had I read the darn thing. I am glad though that the software was easy to manage. The data log files it creates when collecting data can get quite large but not as large as I thought they would get. I actually collected data on the design over the weekend. The file ended up being 1.1g bytes. This is large but not as large as I expected. Because of all the data that it collected, the filtering part of the software became very important. Overall, this is a good product. As I use it on other issues and become more familiar with the filtering process, I can probably give a better review. Currently though, I am quite happy with the product.
Teemu L.
Using for SPI analysis
Good data rate, reliable operation
John G.
Rather a lifesaver
I was recently implementing a project in which the processor needed to access a SPI memory via an I2C bus. While I wasn't able to watch both sides of the conversation at the same time, this analyzer did allow me to monitor both buses. I would have awarded five stars but for two very annoying UI artifacts, related to "reminding you" that it's doing you a favor by changing the "protocol lens" when switching modes, and a scroll enable feature that won't stay enabled. Would I buy another? Absolutely.
Dylan C.
Good product and fast delivery.
Good product and fast delivery.
Mark S.
Very quick to debug the protocol
Its very quick to see the messages and debug the problem.
Great service and quick shipments
Great service and quick shipments
Jonas H.
simply works
Slavica M.
Fast delivery.
Fast delivery.
Ralf H.
Connor O.
Beagle I2C/SPI Protocol Analyzer
This has has not only helped to shorten our development cycle it has also enabled us shorten our communications test and validation time and ensuring a more robust/reliable product. Well worth the money.
Rod D.
Works as expected. No surprises
My Beagle Trace tool arrived the day after I placed the order and works as expected. I am already familiar with the Beagle tool and very satisfied with its usefulness.
Paula O.
Worked well for my engineers
Worked well for my engineers project
David D.
Beagle I2C/SPI Protocol Analyzer Review
I have had the opportunity to start using my newly purchased Beagle analyzer. As with all products from Total Phase, the unit installed without difficulty and I found it easy to use. My only complaint is that the unit is sold without the 10-pin split cable: as I recall, my Aardvark unit was supplied with the cable included at no extra charge so I was expecting it to be included. However, no harm was done in this case as I am able to move the split cable between the two units as required. Personally, I would have preferred a unit that combines the functions and capabilities of the Aardvark and Beagle units but I can live with having them separate. Actually, when I purchased the Aardvark it was advertised as having a monitor function for I2C, which I have used extensively over the years. Albeit, it did not work well at 400 kHz due to its internal buffer filling up too quickly, but it was useful in many situations. At some point, Total Phase quietly issued a PC software update that removed the monitor function and so I started using two different PC software versions for different sessions: the old version for I2C monitoring and the latest version for everything else. That seemed a rather odd move and probably left quite a
Khor H.
so far so good
Mikko M.
Versatile and easy to use product
It was easy getting started with Beagle, got the system analysed in minutes. Problem solved !
Nick R.
Excellent Tool
Great job... Very nice tool. Probably the best out there. Only one minor issue - would be nicer if you could hide "both" spi data streams when looking at miso and mosi. At present you can only display: both + miso + mosi. Would be better as: miso + mosi, or both. Wish it was less expensive too :-)
Hadi Z.
Thank you
I recommend this product. It is flawless
Mike C.
Great product!
This did exactly as advertised. No issues installing drivers, etc., and the deep trace buffer helped us solve several issues we couldn't capture with a storage scope.
Wanseok S.
Principal Engineer
It is very helpful to analyze the I2C transaction.
Peter H.
Easily snooped an SPI interface with ten minutes of opening the box.
Easy to use. Only one complaint: The timestamp on the transactions only has a single format of ss.mmm.uuu Other formats would be nice especially a microsecond only which would be easy to sort in a spreadsheet after export. Otherwise this thing Rocks!
Xavier L.
Beagle I2C/SPI
The tool does what I needed to do. It would be very interesting to let the user define device registry maps and populate the register values as they get captured (last written and last read).
Al B.
Senior Firmware Engineer
Great product... Easy to use and fast... Thanks, Al
Steven S.
Beagle I2C Analyzer easy to set up and take data
After taking the Beagle out of the box, following the simple software installation, and connecting the board to my device under test, I was taking data in a few minutes. I ported the .csv file to Excel to analyze the data, and found my issue quickly. The device is simple, affordable, and flexible to work in a variety of applications. Thanks for a great product.
Katsuyoshi K.
Very good items, our support should be efficient.