6039-ADA Adafruit SPI Flash SD Card - XTSD 4 GB
This breakout board features a unique chip that resembles an SPI Flash memory chip, but it's actually a surface-mount SD card in disguise. It connects like a typical SD card breakout, allowing you to use standard SD card libraries with your microcontroller. For example, it works with Arduino's built-in SD library or CircuitPython's sdcard library. The chip behaves like a 2GB FAT-formatted SD card right out of the box.
While it can't be removed and plugged into a computer like a traditional microSD card, it's ideal for certain applications—such as in high-vibration environments where you don't want a removable SD card to come loose or when size is a concern. Additionally, this chip may be useful when the microcontroller itself acts as a USB mass storage device.
Unlike plain SPI flash memory, this chip handles wear leveling and error correction (ECC) internally, so you don't need to worry about manually erasing blocks. It supports clock speeds up to 50 MHz and has a write speed class of 8, though with basic SPI you may not achieve the same speeds as with SDIO.
The breakout is designed to make working with this chip easy. It operates in SPI mode with level shifters for compatibility with both 3V and 5V logic, a built-in 3.3V regulator, and a pull-up resistor on the chip select (CS) pin. Just connect the SPI pins to your microcontroller, use your preferred SD library, and you're good to go in no time.
Specifications:
- Capacity: 32Gbit (4GByte)
- Operation Conditions Temperature Range: Ta = -25 to +85°C
- Storage Conditions Temperature Range: Tstg = -40 to +150°C
- Supports up to 50Mhz clock frequency
- Built-in HW ECC Engine and highly reliable NAND management mechanism
- Write speed up to class 8
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