PCB design guidelines 1. Purpose and function 1.1 Standardize design operations, improve production efficiency and improve product quality. 2. Applicable range 1.1xxx's VCD Super VCDDVD audio and other products. 3. Responsible for all electronic engineers, technicians and computer plotters of the 3.1xxx Development Department. 4. Qualifications and Training 4.1 has an electronic technology basis; 4. There is a basic operation common sense of computer; 4.3 Familiar with the use of computer PCB drawing software. 5. Work guidance (in size in size) 5.1 Copper foil minimum line width: panel 0.3mm, panel 0.2mm edge copper foil minimum 1.0mm5.2 copper foil minimum gap: panel: 0.3mm, panel: 0.2mm.5.3 The core of the copper foil and the plate side is 0.55mm, the minimum distance of the element and the plate edge is 5.0 mm, and the minimum distance of the disk and the plate is 4.0mm5.4 The size (diameter) pore size of the pads of the spool mounting element, The double panel minimum 1 is 5mm, the single-sided plate is a minimum of 2.0mm, and if the circular pad is not used, the waist disc is not used, as shown in the following figure (if there is a standard element library, The element library is subject to the long side of the weld, the short side and the hole is: 5.5 Electrolytic capacitance does not touch the heating element, high power resistance, sensitive resistance, presser, heat, etc. The interval of the capacitor and the heat sink is at least 10.0 mm. It is a minimum of 2.0 mm. 5.6 large components (eg, a transformer, a diameter of 15.0mm or more, a large current socket, etc.) increase copper. The foil and upper tin area are shown below; the shaded part is small to be equal to the pad area. 5.7 Screw hole radius 5.0 mm does not have a copper foil (required to ground outside). (Required by structural diagram). 5.8 Tin is not silky printing oil. 5.9 The center of the pad is less than 2.5mm, and the adjacent pads are wrapped around, and the binder width is 0.2 mm (discussed 0.5mm). 5.10 Jumpers Do not place under the IC or motor, potentiometer, and other large-volume metal housing. 5.11 In a large-area PCB design (about more than 500 cm 2 or more), the PCB plate bending when the tin furnace is prevented, and a 5 to 10 mm wide voids (traces) are left in the middle of the PCB board, which is used to cross the tin furnace. Plus the pressure strip to prevent the PCB plate, the shadow zone of the following figure: 5.12 Each type of triode must be marked on the silk printing. 5.13 The component that needs to be soldered after tin furnace, the disk is to be opened, reverse the direction of the tin direction, the size of the visual hole is 0.5mm to 1.0mm as shown below: 5.14 When designing the double panel, pay attention to the metal housing The element, the outer casing is in contact with the printed plate, and the top pad is not open, and it must be covered with green oil or silk printing (eg, two-legged crystal). 5.15 In order to reduce the short circuit of the solder joint, all double-faced plates, the over-hole will not open the green window. 5.16 Each PCB must be marked with a solid arrow. The direction of the tin furnace is required: 5.17 hole distance is 1.25mm (dual panel invalid) 5.18 layout, the direction of the DIP package must be in the direction of the tin furnace Vertical, not parallel, as shown below; if there is difficult to layout, the horizontal placement IC (the IC placement direction of the OP package is opposite to DIP). 5.19 The wiring direction is horizontal or vertical, and it is necessary to take 45 degrees from the vertical transfer level. 5.20 components are placed in horizontal or vertical. 5.21 The silk screen is placed horizontally or right. 5.22 If the width of the copper foil into the width of the circuition is less than the diameter of the circular pad, it is necessary to add tears. Figure: 5.23 Material coding and design numbers To place on the board. 5.24 Reasonably uses the place where the wiring is not properly used. 5.25 Wiring as short as possible, pay special attention to clock lines, low level signal lines, and all high-frequency circuit wiring is shorter. 5.26 The ground line of the analog circuit and the digital circuitry and the power supply system must be completely separated. 5.27 If there is a large area of ground and power lines (more than 500 square millimeters) on the printed board, the window should be opened. As shown in Figure 5.28 The positioning holes of the 5.28 electrical plug plate regulations are as follows, the shaded portion is not placed, except for the handbased element, the range of L is 50,30mm, and the range of H is 50250mm, and the fruit is less than 50x50 to be puzzled. Plug, if more than 330x250 is changed to a handset. The positioning holes need to be on the long side. Read more
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