“SD Card Module Guide: SPI/MMC Modes, Pin Definitions, Technical Specs & Bulk Integration”

An SD card module enables seamless reading/writing of SD/TF cards using a single-chip microcontroller. Designed for bulk integration, this low-voltage flash memory product supports two standard operation modes: high-speed MMC (with complex control signals) and simplified SPI (slower but requiring fewer lines). Ideal for embedded systems, it simplifies mass storage solutions without demanding advanced file system knowledge.

Content

1. Overview | 2. Technical Background | 3. Technical Specifications | 4. Operation Functions | 5. Pin Definitions | 6. Operation Commands | 7. Application Areas | 8. Development Kits

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1. SD Card Module Overview for Bulk Integration

The SD card module integrates a built-in file system, allowing direct file operations like directory traversal, creation/deletion, file editing, and card formatting. Compatible with microcontrollers, it eliminates the need to understand SD card storage structures or file system intricacies. As SD cards dominate consumer and industrial storage, embedding read/write functionality into systems has become essential for modern embedded solutions.

2. Technical Background

Traditional microcontrollers often lack resources to support file systems, limiting direct SD card interactions. This module bridges the gap, enabling file-level operations without complex firmware development. It reduces R&D risks, accelerates product launches, and cuts costs for bulk SD card integration in embedded devices.

3. Technical Specifications

1. FAT File System Support: Cards are computer-readable via standard FAT formatting.
2. Expandable Slots: Built-in Micro SD slot with support for SD/MMC cards up to 2GB (larger cards function as 2GB).
3. SPI Communication: Up to 4M bps speed; read/write speeds of 128KB/s and 64KB/s respectively.
4. Compact Design: 50mm x 20mm size with universal 2.54mm pin headers.

4. SD Card Module Operation Functions

– Capacity Management: Check total/remaining space, format cards.
– Directory Control: Create/delete directories, navigate folders.
– File Operations: Create/delete/modify files, read/write/append data.
– Diagnostics: Detect card presence, check firmware versions, monitor power states.

5. Pin Definitions

6. Operation Commands

7. Application Areas

Bulk SD cards are widely used in:
– Consumer Electronics: Dash cams, treadmills, medical devices (blood glucose monitors, ECG machines).
– Industrial Systems: CNC machines, data loggers, parameter configuration tools.

8. Development Kits

The DSM-100 development board uses the STC89C52 microcontroller to demonstrate large-capacity storage integration. Connect via USB to access serial commands for formatting, file/directory management, and data logging. Includes a full source code package for seamless product adaptation.