LD-PULSE-6A rev B0 — 製造說明 / Fabrication & Assembly Notes
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Board: ld6a (LD-PULSE-6A), revision B0          Date: 2026-10-01
Contact / 聯絡人: 楊鈞杰  0933010935 yang140@itri.org.tw



1. 檔案清單 / Files
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01_PCB/ld6a_gerbers.zip              Gerber X2 (9 layers) + Excellon drill (PTH / NPTH, mm) + drill maps + job file
01_PCB/ld6a_IPC-D-356_netlist.ipc    Netlist for electrical test (飛針電測用)
02_Assembly/ld6a_BOM.csv             BOM, 81 lines, with manufacturer part numbers (MPN)
02_Assembly/ld6a_CPL_jlcpcb.csv      Pick & place, JLCPCB column format (145 placements)
02_Assembly/ld6a_CPL.csv             Pick & place, KiCad native format (same data)
02_Assembly/ld6a_assembly_drawing.pdf  Assembly drawing 組裝圖, 6 pages:
                                       p.1 whole board, p.2-5 four enlarged quadrants (every part labelled),
                                       p.6 orientation check list for all polarized and THT parts
03_Drawings/ld6a_fab_top.pdf         Top copper / mask / silkscreen, for reference
03_Drawings/ld6a_fab_bottom.pdf      Bottom copper / mask / silkscreen (mirrored), for reference


2. PCB 製版規格 / PCB specification
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Layers 層數                 2
Size 尺寸                   110.0 x 80.0 mm, R2 rounded corners 圓角
Material 板材               FR-4, standard Tg
Thickness 板厚              1.6 mm
Copper 銅厚                 1 oz (35 um) outer, both layers
Surface finish 表面處理     ENIG 化金  ** REQUIRED 必要 **
                            (U9 is a 0.5 mm pitch VQFN; HASL is not flat enough.
                             The job file says "Finish: None" — please ignore it and use ENIG.)
Solder mask 防焊            Green 綠色, both sides
Silkscreen 文字             White 白色, both sides
Min track / space           0.20 mm / 0.20 mm (actual min clearance 0.225 mm)
Min drill 最小孔            0.35 mm (vias, 322 pcs)
Plated slots 電鍍槽孔       7 (USB-C shield tabs, DC jack) — in the PTH drill file
NPTH 非電鍍孔               6 (4 x 3.2 mm mounting holes, 2 x 0.65 mm USB-C locating pegs)
Impedance control 阻抗      Not required 不需要
Electrical test 電測        Yes, 100 % (IPC-D-356 netlist provided)
Coordinate origin 原點      Board lower-left corner, units mm


3. 貼片 / Assembly (PCBA)
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Sides 面數                  Top side only 單面（底面無零件）
SMD                         138 parts
THT 插件                    7 parts: J2, J3, J4, J7 (terminal blocks / DC jack), J5, J6 (2.54 mm headers), SW1
                            -> 板廠焊接 Assembled by fab (included in BOM and CPL)
                               Terminal blocks J2/J3/J4: wire entry faces the board edge. J7: plug opening at the edge.
Fine pitch 細間距           U9 TPS54824RNVR, VQFN-HR-18, 3.5 x 3.5 mm, 0.5 mm pitch (custom footprint;
                            stencil openings are as drawn in F_Paste)
                            C32, C56: 0402
Stencil 鋼板                Top only, from ld6a-F_Paste.gbr

Not placed 不需貼裝（BOM 有列，但沒有實體零件）:
  TP1-TP6   bare copper test pads 裸銅測試點
  NT1       copper net tie 銅箔短接（PCB 的一部分）
  H1-H4     M3 mounting holes 安裝孔
  (These are not in the CPL, and are drawn dashed / grey in the assembly drawing.)

No MPN in BOM — generic parts OK 未指定料號，可用通用品:
  J5        1x5 pin header, 2.54 mm, vertical
  J6        1x3 pin header, 2.54 mm, vertical
  SW1       6 x 6 mm THT tactile switch

Substitution 替代料:
  NO substitution without approval 未經同意不可替代:
    U1-U12, Q1, Q3, Q5-Q8, R17 (0.020 ohm 4-terminal shunt), L1, L2, C1, C2, C26, D1, D5, F1, J1
  Passive R / C may use equivalents with the same value, size, tolerance, voltage and dielectric.

Placement & polarity 位置與極性 — please check in your DFM / placement preview:
  CPL positions and rotations were checked part by part against the PCB (145/145 match).
  KiCad rotation convention is used in the CPL. Verify the orientation of all ICs (U*), transistors (Q*),
  diodes and LEDs (D1-D9), and polarized capacitors C1, C2, C26 against 02_Assembly/ld6a_assembly_drawing.pdf:
  red pad = pin 1;  K = diode / LED cathode;  + = capacitor positive.  Full list on page 6 of the drawing.
  Reference designators and polarity marks are also printed on the board silkscreen (03_Drawings/ld6a_fab_top.pdf).

Programming 燒錄:
  U5 (PIC16F18346) is NOT programmed by the fab. 板廠不需燒錄，韌體由客戶經 J5 (ICSP) 燒錄。
