The Sony Spresense Extension Board enhances the capability of your Spresense Main Board, offering a broad range of audio, storage, and interface expansions. Designed for IoT developers, edge AI engineers, and embedded system prototypers, this board delivers flexible connectivity options with digital/analog microphone support, microSD storage, headphone out, and USB MSC functionality.
Whether you're developing a voice-based interface, sensor gateway, or data logger, the Spresense Extension Board provides the critical features needed for advanced edge deployment.
Key Features
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4 analog or 8 digital microphone input channels
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3.5mm headphone jack with amplifier
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microSD card slot for FAT32-formatted storage
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Dual USB interfaces for MSC and programming
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Selectable GPIO voltage (5V or 3.3V)
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B2B connector for main board stacking
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Includes spacers for stable board stacking
Specification
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Model: CXD5602PWBEXT1
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Size: 68.6 mm × 53.3 mm
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Audio I/O: 4 ch analog mic input / 8 ch digital mic input / headphone out
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Digital I/O: 3.3V or 5V logic
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Analog Input: 6 channels (5V range)
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External Storage: microSD slot (FAT32 required)
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USB Support: Mass Storage Class via USB-B
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Operating Temp: 10–40 °C, Humidity: 30%–80% (non-condensing)
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Storage Temp: -20–60 °C, Humidity: 10%–80%
I/O & Interface Breakdown
| Name | Description |
|---|---|
| CN3 | B2B connector for main board |
| CN4 | microSD card slot |
| CN6 | Micro USB Type-B (MSC function) |
| CN7 | 3.5mm headphone jack |
| JP1 | Jumper to select 3.3V or 5V GPIO |
| JP10 | Microphone connector |
| JP14 | Digital mic jumper setting |
| microSD | FAT32 required format (for SDHC cards only) |
Mounting the Extension Board
The extension board includes 4 plastic spacers for secure installation.
To attach it:
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Insert spacers into the four mounting holes on the extension board.
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Align the USB connectors of both boards to face the same direction.
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Stack the main board onto the extension board and press down to connect via the B2B socket.
Application Scenarios
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Voice-enabled IoT devices
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Smart audio edge processors
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Sensor aggregation and storage nodes
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Real-time data logging with SD backup
Shipping List
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Sony Spresense Extension Board ×1