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MT-SD MicroSD Card Slot with 3.3V LDO regulator and voltage translator

Availability: In stock

Accepting MC, VISA, AMEX, Discover, PayPal

Quick Overview

Note that the card detect pin does not work (it is always grounded).


The MT-SD is a MicroSD card slot with an onboard 3.3V LDO regulator and a level translator to convert between 3.3V and the microcontroller Vcc rail (3.3V to 5.5V), all mounted on a 26mm (1”) square PCB with flexible configuration and connection options. The card slot has a push-push spring mechanism to secure the card in place. The board can be connected using the 9 pin single inline header with 100 mil pin spacing (typically using 6 or 7 pins). A SPI header is available which can be used to mount to the ISP/SPI or PDI/SPI connectors of many MattairTech boards, or to mount to the ISP-only connectors found on most AVR development and Arduino boards (must route CS separately). The regulator input can be up to 16V. It can output up to 250mA which can be used by external devices using the 3.3V pin. Both the regulator and the level translator have very low quiescent current consumption (2uA and 3.5uA, respectively). Eight pullup resistors ensure that all lines are pulled high when not driven by the MCU or MicroSD card. A green LED indicates 3.3V power. It can be disconnected to save power. The PCB is high-quality with ENIG (gold-plated) finish, blue soldermask, and white screenprinting showing the pinout. There is one 3mm mounting hole (~5mm pad). The PCB itself measures 26mm x 26mm x 1.6mm (1” x 1” x 0.062”).


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* Required Fields




*    MicroSD card slot with push-in/push-out spring action
*   Onboard 3.3V, 250mA LDO regulator
           Up to 16V input on Vin pin
           extremely low quiescent current (2.0uA typical)
           low dropout (525mV typical @ 250mA, 725mV max. @ 250mA)
           Over-current and over-temperature protection
           Can use 3.3V output for external devices
           Can disconnect regulator and supply your own 3.3V
*   Vcc (MCU) to 3.3V (SD card) level translator onboard
           Vcc (MCU IO voltage) can be from 3.3V to 5.5V
*   100Kohm pullup resistors
           All SPI pins (CS, SCLK, SI, and SO) have pullups on both sides of the translator
*   Green power LED (can be disconnected)
*   All MicroSD pins routed to headers, including card detect, and D1 & D2 (4-bit SD mode)
*   Can be mounted on an ISP header (AVR based boards)*
           With MT-DB-xx boards, all connections can be routed through ISP or PDI header
           With Arduino or other boards, all but CS are routed through the ISP header
*   Solder jumpers for flexible configuration
*   High-quality PCB with gold-plated finish
*   One 3mm mounting hole (~5mm pad)
*   Measures 26mm x 26mm (1” x 1”) and 1.6mm (0.062”) thick


   User Guide



This development board/kit is intended for use for FURTHER ENGINEERING, DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is not a finished product, and may not (yet) comply with some or any technical or legal requirements that are applicable to finished products, including, without limitation, directives regarding electromagnetic compatibility, recycling (WEEE), FCC, CE, or UL (except as may be otherwise noted on the board/kit). MattairTech LLC supplied this board/kit AS IS, without any warranties, with all faults, at the buyer's and further users' sole risk. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies Atmel from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge and any other technical or legal concerns.

The authors disclaim all warranties with regard to this software, including all implied warranties of merchantability and fitness. In no event shall any author be liable for any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or profits, whether in an action of contract, negligence or other tortious action, arising out of or in connection with the use or performance of this software.

Accepting MC, VISA, AMEX, Discover, PayPal