Please tell me how to draw the differential line of this USB

吃星星的狼

Please tell me how to draw the differential line of this USB [Copy link]

For this kind of USB package, the pads of the data port are asymmetrical. How should I draw the differential lines?

qwqwqw2088

The pad centers are on two lines, that is, the two Y coordinates are consistent.

Determine the coordinates of one hole, and locate the rest according to the coordinates.

qwqwqw2088

Then try to run the lines symmetrically and in parallel, with consistent line width and line spacing, etc.

吃星星的狼

qwqwqw2088 posted on 2020-4-24 16:17 Then try to make the lines symmetrical and parallel, with consistent line width and line spacing, etc.

Thank you. I saw some samples directly used pads 2 and 4 as data ports, and pad 3 was not used. How was it done?

lcofjp

The wolf who eats stars posted on 2020-4-24 16:21 Thank you, I saw that some samples directly use the 2nd and 4th pads as data ports, and the 3rd pad is not used. How is it done?

You have to make sure your package is correct. Which pad to use is determined by the USB socket. If the sample you are referencing has the same USB socket as the one you are using, there may be something wrong with your package.

吃星星的狼

lcofjp posted on 2020-4-24 16:41 You have to make sure your footprint is correct. Which pad to use is determined by the USB socket. If the sample you are referring to has the same USB socket as the one you are using, it may be...

Thanks, I understand.

chineseboyzxy

The wolf who eats stars posted on 2020-4-24 16:21 Thank you, I saw that some samples directly use the 2nd and 4th pads as data ports, and the 3rd pad is not used. How is it done?

Pin 4 is generally not used, so you can just short-circuit pins 4 and 3, which makes it easier to draw lines.

qwqwqw2088

qwqwqw2088 posted on 2020-4-24 16:17 Then try to make the lines symmetrical and parallel, with consistent line width and line spacing, etc.

To draw the PCB diagram according to the principle drawing,

If pads 3 and 4 are shorted, you need to convert the PCB drawing after changing it on the schematic. This is the process