[Lanqiao Cup Exercise 1] 51 Microcontroller Development Board

Lanqiao Cup EDA Competition Design and Development Subject Design Part 1 Training Questions

(Provided by Lichuang EDA, for training purposes only)

Question library document design (5 points)

        Create a new component package and name it: LQ-DIP-40. The package design requirements are shown in the figure below. (5 points)

Figure 1 Package design (LQ-DIP-40)

Design requirements:

• Set pad 1 (lower left corner) as the coordinate origin.
• Pad size: hole outer diameter is 1.8mm, inner diameter is 1.0mm
• Pad shape: round (multi-layer)

Question 2 Schematic Design (20 points)

New Construction;

        Open the schematic file sch.json provided in the "Resource Data Package"; complete the schematic design according to the following requirements.

1. According to the sample diagram given, complete the placement of component symbols, line drawing and network addition in the buzzer driver circuit design area (Buzzer Driver). (12 points)

Figure 2 Digital tube drive circuit

Design requirements

• The placement of components is basically the same as the sample picture.
• The number, value, network label name, component network connection relationship, etc. of the components need to be completely consistent with the schematic diagram, otherwise the score will be zero.

2. In the LED design area (LED Drivers), according to the given circuit connection relationship, calculate the values ​​of resistors R12 and R13 (assuming VF is 2V and the conduction current is 15mA), and fill in the calculation results into the R12 and R13 components in the name of the attribute. (8 points)

Schematic design description:

• The component number and network connection relationship that have been given in the "resource data package" schematic diagram cannot be modified.
• Symbol libraries other than "resource packages" cannot be used.

Question 3 Printed circuit board design (45 points)

1. Preparation

• Open the PCB.json file provided in the Resource Pack and add it to the project file.
• According to the symbol-package correspondence given in the table below, add device packaging information to the schematic diagram and import it into the PCB.

Note: All package libraries are searched and bound in the library list of Lichuang Mall.

2. Component layout

• LCD1602 1 pin coordinates (12.996mm,-10.76mm).
• All devices are placed on the top layer.
• common enquiries:

        Reasonably arrange the layout. Components should be arranged parallel or vertically to each other in order to be neat and beautiful. Overlapping of components is not allowed. The arrangement of components should be compact, and the components should be evenly distributed and dense throughout the entire layout.

3. Wiring design

• Complete the wiring design within the given PCB border layer.
• PCB design requirements

        Minimum line width: ≥14mil Line spacing: ≥6mil

        Via size: 20mil/40mil Number of wiring layers: 2

        Character layer: The top silk screen layer requires the characters to be placed neatly. Copper layer: top layer, bottom layer, GND network.

        Cloth rate: 100%

4. File export

Export the netlist from the schematic (Free PCB format) and rename it to USER.net.

*Document submission requirements

1. Complete the design of the LQ-DIP-40 package according to the design requirements of the first library file of the test question, export the Lichuang EDA package library file, and name it LQ-DIP-40.json.

2. According to the schematic design requirements of question 2, complete the drawing of the schematic diagram, export the EasyEDA schematic diagram file, and name it SCH.json.

3. Complete the PCB design according to the PCB design requirements of question three, export the EDA PCB file, and name it PCB.json; export the netlist file (Free PCB format) to USER.net.

4. The compressed file package finally uploaded by the contestant should contain four files: LQ-DIP-40.json, SCH.json, PCB.json, and USER.net.

5. Contestants who fail to name and submit documents as required will have their points deducted or zero points as appropriate. Contestants who submit documents that do not meet the test question requirements will have their points deducted as appropriate.

Video teaching materials: https://www.bilibili.com/video/BV1LP4y1E7Hd?p=4

Test question package: Please download it from the attachment.