Pay attention to the use of card edge connector?
Release time: 2023-01-31
When the card edge connector is designed to connect more than 3 points, the line passes through each point regularly, which is convenient for later testing and the line length is shortened as much as possible. Avoid wiring around the pins, and pay special attention to reducing the wiring design between and around the IC pins. Next, we will talk about the small knowledge points related to the use of the card edge connector, hoping to bring help to more people and make it bring more benefits.
When the card edge connector is designed to connect more than 3 points, the line passes through each point regularly, which is convenient for later testing and the line length is shortened as much as possible. Avoid wiring around the pins, and pay special attention to reducing the wiring design between and around the IC pins. Next, we will talk about the small knowledge points related to the use of the card edge connector, hoping to bring help to more people and make it bring more benefits.
The adjacent layers of the card edge connector should not be connected in parallel. The same floor is still possible. For example, it is enough to output 8 address buses and 8 data buses in parallel. In theory, as long as the lines of the card edge connector are parallel, there will be interference, but this does not mean that it cannot work effectively. Minimize bending and kinking of cables to avoid electromagnetic radiation. For multiple logic circuits, the ground and power lines are designed to be at least 10-15 mils or more. Try to connect pavement polylines to increase ground area. The card edge connectors should have neat lines from row to row. In the early stage of wiring, the reserved space should be considered, and the components should be uniformly arranged in the later stage to facilitate the installation, connection and welding operations of subsequent components. The text is placed on the current character layer in a reasonable position, pay attention to the direction, avoid occlusion, and facilitate processing and production. The installation of components in rows of card edge connectors is considered from the perspective of space. The positive and negative poles of SMT components are marked on the package and at the end to avoid space conflicts. When the card edge connector is wired, factors such as current consumption have more influence. The components of the function block shall be assembled as far as possible to facilitate the later inspection. Special reminder: the zebra pattern and other components near the LCD screen should not be too close. The through hole should be coated with green oil (set to double negative).
Do not place pads or space under the battery base of the card edge connector to ensure the firmness of repeated use. The size of PAD and VIL should be reasonable. Need to check carefully: after the wiring is completed, carefully check whether each connection (including NETLABLE) is really connected (available lighting method). The components of the oscillation circuit should be as close as possible to the IC chip, and the oscillation circuit should be as far away as possible from the antenna and other vulnerable areas. The ground pad should be placed under the crystal oscillator. More attention should be paid to the use of armor, hollow parts and other ways to avoid excessive radiation sources. It should be noted that the power supply layer and the ground layer of the card edge connector are adjacent to each other, and the parasitic capacitance between the two layers of copper foil is used to achieve a better high-frequency decoupling effect of the power supply in order to produce the same effect similar to that of the filter capacitor. Each component signal trace layer should be adjacent to the power layer or ground layer, which can minimize the signal loop area. Pay special attention to the proximity of the signal line of the high-speed clock to the ground plane.
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