Pololu Breakout Board for microSD Card with 3.3V Regulator and Level Shifters

Pololu Breakout Board for microSD Card with 3.3V Regulator and Level Shifters

10,95 € (Net 9,20 € )

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SKU: PO2587
GTIN: 4060137107856
Category: Storage
Manufacturers: Pololu
MPN: 2587
Storage Tiers: Maintain

Description
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This compact board breaks out the pins of a microSD card connector necessary to interface with the card through SPI (Serial Peripheral Interface), and it can be directly integrated into 5 V systems thanks to its on board 3.3 V regulator and level shifting circuits. The 0.1″ pin spacing allows compatibility with standard perfboards, solderless breadboards, and 0.1" connectors.

This carrier board makes it easy to interface a microSD memory card (originally known as TransFlash) with an SPI-capable microcontroller, offering a convenient and inexpensive way to add gigabytes of non-volatile storage to an embedded project. It includes a 3.3 V regulator and level shifters on the four SPI lines, enabling direct integration into 5 V systems, and it provides access to the all of the connections through single 1×9 row of 0.1″-spaced through-holes. A breakaway 0.1″ male header strip is included, which can be soldered in to use the board with breadboards, perfboards, or 0.1″ female connectors, and the board has two mounting holes for #2 or M2 screws.

For 3.3 V projects, we carry a smaller Breakout Board for MicroSD Card without the 3.3 V regulator, level shifters, and mounting holes. This more basic module (shown in the right picture below) breaks out all of the microSD pins (including the ones used for the SD bus mode interface) rather than just the SPI-interface pins.

For a microSD socket and user-programmable microcontroller on a single board, consider our A-Star 32U4 Prime controllers, which essentially use the same level-shifting circuits to interface a microSD card with an Arduino-compatible ATmega32U4 MCU running at 5 V.

Pin Description

EN: Enables the 3.3 V regulator. This pin is pulled-up to VDD through a 100 kΩ resistor to enable the regulator by default.
CD: Card detect. This pin is pulled up to VDD through a 100 kΩ resistor. When a card is inserted, it is high; when no card is inserted, it is shorted to ground.
CS: Chip select (must be driven low to talk to the microSD card)
SCLK: SPI clock
DO: SPI data out (MISO) level shifted to 5 V
DI: SPI data in (MOSI)
3V3 (OUT): Output from the 3.3 V regulator
GND: Power and logic ground
VDD: Supply voltage (5 V)

Dimensions

Size: 0.94″ × 0.9″ × 0.12″. Without a microSD card or the included optional header pins. When inserted, a microSD card will extend approximately 35 mil (0.85 mm) past the edge of the board.
Weight: 1.8 g. Without a microSD card or the included optional header pins.