PCB News - SD card PCB design considerations

SD card PCB design considerations

1. Pay attention to the accuracy of the part number and board name. The part number and board name include the name of the schematic diagram, the schmetic file name under the schematic diagram, and the document description part in the lower right corner of the schematic diagram. The schematic diagram does not have the pins connected to the network to be crossed. If there was a network lead connector before, after deleting the network name, there will still be a network name, such as NET-XXX with a system number. At this time, the DRC will make an error, and the lead wire needs to be completely deleted and crossed.

2. Export the CAD file and send the file with the extension DXF to the manager of the engineering department. Note that the unit is mm.

3. SD card layout, first place the files according to actual needs. Coordinate positioning must be adopted to place the documents to ensure that there is no difference. Note that the main control and FLASH should not be close to the edge, and at least 0.5mm of space should be reserved for production considerations.

4. Wiring must first clarify the primary and secondary relationship between the signal lines. The main signal lines are CLK and VSD. Generally speaking, the CLK signal line needs to be surrounded by ground or ground.

5. After completing all wiring for the ground signal, lay copper and observe to make the ground as large as possible and the gap between the signal lines as small as possible, so that the ground can be enlarged. The ground of the top layer and the bottom layer should be connected reliably, and if there are copper skins on the top and bottom, more holes should be drilled to connect.

6. For the test points, try to distribute the test points in a balanced state, and the spacing must be consistent, so that they can be more fixed.

7. To make a board, the files that need to be exported include GERBER files and puzzle drawings. Pay attention to the material requirements that need to be noted when requesting the board.

The above is the introduction of SD card PCB design considerations. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.