Why does the STM series MCU use SMD T card instead of traditional T card?

雷龙发展

Why does the STM series MCU use SMD T card instead of traditional T card? [Copy link]

Recently, we have sorted out some customer questions and discussed many storage issues. For example, when using small-capacity T cards, have you encountered some problems? 1. What should I do if the size (volume) of the T card is too large? 2. Poor contact of T card may cause looseness. Even the final product may be returned due to poor contact of T card during transportation from the factory to the end user. 3. The T card is very difficult to solder. 4. The T card is pluggable. I am always worried that the data will be copied out. 5. The quality of T cards purchased from the market is not very good. The quality is uneven, some batches are good, and some batches are not. 6. The system always prompts that it cannot find the T card. 7. The system always prompts to format the T card. Regarding 1234 type of problems, this is determined by the technical standard of the T card itself. It is a standard designed for a pluggable module, not a standard designed for a chip soldered on a PCB board. For the 4567 type of problems, it is the target market of the T card that determines it. The internal architecture of the T card can be simply understood as: NAND Flash wafer + controller + Firmware. Since the T card is currently mainly aimed at ordinary consumers, it is difficult and unnecessary to make the three elements of each T card exactly the same, so the T cards on the market are a messy combination of these three elements. In addition, some merchants use ink die NAND Flash wafers, which makes the quality and consistency of T cards unguaranteed. SD NAND can solve the above problems. SD NAND is commonly known as SMD T card or SMD TF card. It is a WSON-8 package, 6x8mm, small in size, with few pins, and easy to solder on the PCB board; because the chip is built into the product, it is relatively difficult to copy the data inside, reducing the risk of product data leakage. SD NAND has the longest life and most stable SLC NAND wafer among all NAND Flash. The erase and write life can reach 100,000 times and it is more resistant to high and low temperature and current shock. Very good consistency: unified Flash wafer, unified controller, unified Firmware. Some people also care about "appearance". The use of T card in products makes end users feel a little low (think about the time when Steve Jobs launched the iPhone without T card interface), and the style is not high enough. At this time, the use of SD NAND can also meet this demand. Currently, many customers who are using small-capacity T cards have switched to using SD NAND. If you are interested in SD NAND, please feel free to comment and reply.

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Some products have a small space for memory cards, so small capacity T cards can meet the requirements and are low cost. The original poster wants to recommend SMD T cards, without having to avoid the cost of chip-level cards.