{"id":15978,"date":"2017-07-28T15:01:52","date_gmt":"2017-07-28T07:01:52","guid":{"rendered":"http:\/\/www.seeedstudio.com\/blog\/?p=15978"},"modified":"2017-11-09T16:36:29","modified_gmt":"2017-11-09T08:36:29","slug":"fiducial-mark-structure","status":"publish","type":"post","link":"https:\/\/www.seeedstudio.com\/blog\/2017\/07\/28\/fiducial-mark-structure\/","title":{"rendered":"Fiducial Mark Structure – PCB DFM 11"},"content":{"rendered":"

11.2.1 Panel Fiducial Marks and Image Fiducial Marks<\/strong><\/p>\n

[97] Size\/Shape: a solid filled circle with a diameter of 1.0 mm.
\nSolder mask opening: 2.00mm in diameter and concentric with the Fiducial.
\nCovering copper: an octagonal copper ring 3.00mm in diameter concentric with the Fiducial and clearance
\nArea.<\/p>\n

\"Structure<\/p>\n

Figure 60: Structure of Panel and Image Fiducials.<\/p>\n

11.2.2 Local Fiducial<\/strong><\/p>\n

[98] Size\/Shape: a solid filled circle with a diameter of 1.0mm.
\nSolder mask opening: 2.00mm in diameter and concentric with the Fiducial.
\nCovering Copper: not needed.<\/p>\n

\"Structure<\/p>\n

Figure 61: Structure of local Fiducials.<\/p>\n

11.3 Position of Fiducials<\/strong><\/p>\n

[99] In General: PCBs which require SMT automated assembly must have Fiducial marks on the necessary
\nlayers. PCBs which only require manual soldering do not require Fiducial marks.
\nFor single-sided boards, Fiducial marks are only required on the side where the SMD components are to be
\nsoldered.<\/p>\n

For double-sided boards, both sides must have Fiducial marks. The position of the Fiducial marks must be
\ngenerally consistent (except for mirror panels).<\/p>\n

\"double
\nFigure 62: Both sides of a double sided PCB should generally be consistent with each other.<\/p>\n

11.3.1 Panel Fiducial Marks<\/strong>
\n[100] Panel Fiducials and image Fiducials should be located on the panel margins and on individual
\nsub-boards respectively. There should be three panel Fiducials per board and three local Fiducials per
\nsub-board, arranged in an \u2018L\u2019 shape as far from each other as possible, as shown in Fig. 63:<\/p>\n

\"pcb
\nFigure 63: Fiducial positioning requirements on the panel margins and individual boards.
\nWhen using mirrored panelization, the panel Fiducial marks must be consistent after flipping.<\/p>\n

11.3.2 Image Fiducial Marks<\/strong>
\n[101] There must be three Fiducial marks per sub-board, arranged in an \u2018L\u2019 shape, located as far as possible
\nfrom each other. The distance from the origin of the Fiducial mark and the edge of the sub-board should be
\ngreater than 6.00mm. If it is not possible to ensure that the four edges satisfy this requirement, then the
\nrequirement must be satisfied for the primary side at least.
\n12.3.3 Local Fiducial Marks
\n[102] For devices with gullwing pins and a pin pitch of 0.4mm, and surface array packaged devices with a
\npin pitch of 0.8mm, local Fiducial points are required.
\nTwo local Fiducial marks are required per component and must be symmetrical on both sides of the origin of
\nthe component.<\/p>\n

\"Local
\nFigure 64: Local Fiducials must be symmetrical about the component\u2019s origin.<\/p>\n

If you already know about the design rules, then turn to Seeed Fusion for pcb manufacturing and assembly<\/a> now!<\/p>\n

More Chapters:<\/strong>
\n1.\u00a0Brief Introduction<\/a>
\n2.\u00a0Seeed Fusion PCB Specification<\/a>
\n3.\u00a0Panelization and Bridge Design<\/a>
\n4.\u00a0Component Layout Considerations<\/a>
\n5.\u00a0PCB Hole design<\/a>
\n6.\u00a0Solder Mask Design<\/a>
\n7.\u00a0Copper Trace Design<\/a>
\n8.\u00a0Silkscreen Design<\/a>
\n9.\u00a0PCB Lamination Structure<\/a>
\n10.\u00a0PCB Dimensions Specification<\/a>
\n12.\u00a0Surface Treatment<\/a>
\n13.\u00a0Files for Manufacture Requirements<\/a>
\n14.\u00a0Appendix\u00a0<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

11.2.1 Panel Fiducial Marks and Image Fiducial Marks [97] Size\/Shape: a solid filled circle with<\/p>\n","protected":false},"author":40,"featured_media":15979,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"iawp_total_views":0,"footnotes":""},"categories":[1],"tags":[4,648],"class_list":["post-15978","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-pcb","tag-pcb-dfm"],"yoast_head":"\nFiducial Mark Structure - 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