Good little bit of kit for troubleshooting and reverse engineering serial devices
Sebastian Mann
SparkFun
USB Logic Analyzer - 24MHz/8-Channel
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An 8-channel USB logic analyser with sampling rates up to 24 MHz, ideal for debugging UART, I2C, SPI, and other digital communication protocols. Compatible w...
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An 8-channel USB logic analyser with sampling rates up to 24 MHz, ideal for debugging UART, I2C, SPI, and other digital communication protocols. Compatible with both 3.3 V and 5 V logic levels and powered directly via the USB Type-C connection.
Works with PulseView and the open-source sigrok software suite for cross-platform signal analysis on Windows, macOS, Linux, and Android.
Key Features
- 8 Channels – Monitor multiple signals simultaneously
- Up to 24 MHz Sampling – Configurable down to 20 kHz
- 3.3 V and 5 V Compatible – 2.0 V minimum logic-high, 5.25 V maximum input
- USB Type-C – Modern connector, USB-powered
- Open-Source Software – Compatible with sigrok/PulseView
- Cross-Platform – Windows, macOS, Linux, Android
Specifications
- Channels – 8
- Maximum Sampling Rate – 24 MHz
- Maximum Input Voltage – 5.25 V
- Logic-High Threshold – 2.0 V minimum
- Logic-Low Threshold – 0.8 V maximum
- Input Impedance – >100 kΩ, 5 pF
- Connector – USB Type-C
- Dimensions – 54.7 × 27.4 × 14.1 mm
Ideal For
- Debugging UART, I2C, SPI, and other serial protocols
- Reverse engineering unknown communication buses
- Verifying timing and signal integrity
- Electronics workbench and embedded development
Package Contents
- 1× 24 MHz / 8-Channel USB Logic Analyser
- 1× 10-conductor female-to-male jumper wires
- 1× USB Type-C cable
Note: On some units, the GND pin adjacent to input 6 may output a clock signal instead of ground. Avoid using that pin.
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- Impedance
- Impedance is the total opposition a component or circuit presents to alternating current, measured in ohms, combining resistance with frequency-dependent reactance. It appears in many contexts, such as matching a speaker's impedance (for example 4 ohm or 8 ohm) to an amplifier or the input and output impedance of signal circuits, and a correct match helps avoid weak signals, distortion or damage.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- Type-C
- USB Type-C (USB-C) is a small, reversible USB connector used for charging, power, and data transfer on many modern devices. A Type-C port or plug indicates the cable and charger connection needed to power, charge, or communicate with a device.
- UART
- UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.
- USB Type-C
- USB Type-C is a small, reversible USB connector used for power, data and sometimes video on many modern devices. The connector itself does not guarantee a particular speed or voltage, so check the supported USB version, data rate and whether it carries more than 5V via USB Power Delivery.
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