SONY CXD5602PWBEXT1E Spresense Extension Board
The Spresense extension board is a board which extends the interfaces compared to the Spresense main board. The Spresense main board and the Spresense extension board are connected by a Board-to-Board (B-2-B) connector. The Spresense extension board has Arduino Uno pin compatible shape and pin socket locations.
There are some differences between the Spresense and the Arduino Uno though, primarily as the Spresense runs at 1.8V, so the expanson board utilises a level shifter to convert signals to 3.3V or 5V. This can cause compatibility issues with some shields and devices. For a list of other differences, Sony have compile a LIST!
The Spresense extension board has the following connectors in addition to Arduino Uno compatible pin sockets:
- 3.5 mm headphone jack
- Micro SD card
- An extra USB port
- Multiple microphone pins
The extension boards configuration is set by jumpers.
The micro SD card that can be used with the Spresense extension board must be formatted in FAT32.
The only "SDHC" micro SD card is formatted with FAT32 at the time of shipment from the manufacturer.
For cards formatted with other file systems, format them in FAT32 using a formatting tool for SD cards in a PC etc. beforehand.
The following block diagram shows the extension board design: