SQ Series: 4 channels logic analyzer and pattern generator

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SQ series (ScanaQuad) logic analyzer let capture, analyze and generate logic signals on 4 channels, at sampling rates up to 200MHz. They connect via USB to a computer running our free ScanaStudio software to display, decode and analyze captured signals.

Being 4 channels makes it a low budget device, while still covering all serial protocols analysis and debugging needs. That includes (but not limited to): SPI, I2C, USART, 1-Wire, CAN, LIN, I2C, RS232, RS485, TWI and much more (click for full list of supported protocol decoders).

Capture and generate logic signals

ScanaQuad is also able to generate captured signals (play back), or build genuine arbitrary test patterns, like UART, SPI or I2C packets. It can also be used to compose and generate Frequency modulation (FM) signals and pulse width modulation (PWM) signals. Thanks to the mixed mode, SQ devices can even capture and generate digital signals simultaneously. Mixed mode is specifically designed to allow engineers to stimulate a circuit with test signals and capture its response.

Embedded memory

SQ series logic analyzers come with an embedded memory to store captured samples, as well as the patterns to be generated. Hence, SQ devices do not live-stream captured signals over USB. This has one big advantage: the performance do not depend on the host computer USB port performance

Powerful trigger options

  • Edge trigger
  • Logic change on one or various channels
  • Trigger on a sequence of timed logic signals
  • Trigger on a protocol word or event (like serial word or I2C address acknowledge)

SQ family overview

SQ series is composed of 4 different versions: SQ25, SQ50, SQ100 and SQ200. All versions have 4 channels. They cover sampling rates from 25MHz up to 200MHz, and sampling depths of 256K points / channel up to 4M points / channel. The table below summarizes the main differences between the 4 models.

Sampling rate (Max)25 MHz50 MHz100 MHz200 MHz
Sampling depth (Max per channel)256 Kpts1 Mpts2 Mpts4 Mpts
Trigger optionsEdge, level, pulseEdge, level, pulse,
arbitrary pattern,
serial protocol
Edge, level, pulse,
arbitrary pattern,
serial protocol
Edge, level, pulse,
arbitrary pattern,
serial protocol
Differential input pairs001

Typical applications

By combining logic analyzer and pattern generator capabilities in a single low price device, SQ is a perfect solution for students and small design houses. For more channels and more performances, check SP series logic analyzers.

  • Embedded systems
  • Firmware development and debugging
  • Educational work
  • Serial protocols analysis, like I2C, SPI, UART or 1-Wire (non exhaustive list)
  • Reverse engineering


  • Get quick insight into your serial communication application.
  • Software lets you view decoded signals in many different levels of abstractions (Packets or detailed bits and bytes)
  • Device performance do not depend on USB connection bandwidth
  • Software running on Windows, macOS and Linux.
  • Software is intuitive and very easy to use.
  • Generate test patterns to stimulate a system without any other equipment.