Overview
Adafruit SPI Flash SD Card - XTSD 512 MB is a breakout for a unique storage chip that looks like an SPI flash IC, but works like an SD card in an SMT package. Connect it like a standard SD card breakout and use familiar SD card libraries with your microcontroller.
The board appears as a 512 MB FAT-formatted storage device and comes pre-formatted for quick setup. It is compatible with the built-in Arduino SD library, and CircuitPython users can work with it using the sdcard library.
This makes it a practical choice for embedded logging and file storage where removable media is inconvenient, such as high-vibration devices, space-limited designs, or projects where the microcontroller exposes files over USB mass storage. Unlike raw SPI flash, the onboard NAND controller manages wear leveling and ECC internally, so you can read and write it like a normal SD card. Important: this breakout is intended for microcontroller use and cannot be plugged directly into a computer like a MicroSD card.
Specification
Technical details for Adafruit SPI Flash SD Card - XTSD 512 MB.
| Specification | Details |
|---|---|
| Storage Capacity | 512 MB |
| Interface | SPI mode, SD card compatible |
| File System | FAT, pre-formatted |
| Maximum Clock | Up to 50 MHz |
| Write Speed Class | Class 8 |
| Logic Compatibility | 3V and 5V logic support via onboard level shifters |
| Power Features | Onboard 3.3V regulator and CS pull-up |
| Memory Handling | Built-in wear leveling and ECC management |
Pinout
| Pin | Type | Description |
|---|---|---|
| VIN | Power input | 3-5V DC input. Use the same voltage level as your microcontroller logic. |
| 3V3 | Power output | Regulated 3.3V output from the onboard regulator, available for up to 100mA. |
| GND | Power | Common ground for power and logic. |
| SCK | Input | SPI clock input. |
| MISO | Output | SPI data output from the storage chip to the microcontroller. |
| MOSI | Input | SPI data input from the microcontroller to the storage chip. |
| CS | Input | Chip select input. Pull low to begin an SPI transaction. |
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