gokul/lora-device

docs/assembly-orientation.md

# Assembly orientation reference

Coordinates are millimetres in the PCB coordinate system: origin at board centre, +X right, +Y up in the top-view drawing. Bottom components are listed in these same board coordinates. Use the bottom drawing as labelled; do not mirror the coordinate list twice. The native rotation column records the authored PCB rotation and is not a supplier feeder angle.

| Ref | Side | MPN | Pad 1 / cathode X | Pad 1 / cathode Y | Board rotation |
|---|---|---|---:|---:|---:|
| D1 | top | LTST-C190KGKT | 10.2510 | -5.5001 | 0° |
| D2 | top | LTST-C190KFKT | 14.2510 | -5.5001 | 0° |
| D3 | top | LTST-C190TBKT | 18.2510 | -5.5001 | 0° |
| J1 | top | TYPE-C-31-M-12 | 22.3251 | -33.5943 | 0° |
| J2 | top | B3B-PH-K-S | -21.0000 | -7.5000 | 0° |
| SW1 | top | TS-1088-AR02016 | -13.1849 | -6.5000 | 0° |
| SW2 | top | TS-1088-AR02016 | -5.1849 | -6.5000 | 0° |
| SW3 | top | TS-1088-AR02016 | 2.8151 | -6.5000 | 0° |
| U1 | top | ESP32-S3-WROOM-1-N8 | -3.1002 | -30.6046 | 180° |
| U2 | top | BQ24074RGTR | 18.5000 | -20.2498 | 0° |
| U3 | top | TPS63021DSJR | 4.4999 | -22.4501 | 0° |
| U4 | bottom | Wio-SX1262 | 21.4700 | -16.0000 | 0° |
| U5 | top | SAM-M10Q-00B | -6.6000 | 19.8000 | 0° |
| U6 | top | USBLC6-2SC6 | 17.0500 | -29.6491 | 0° |
| U7 | bottom | TPS22918DBVR | 5.6500 | -5.9500 | 0° |
| U8 | bottom | SN74LVC2G125DCUR | 4.4000 | -8.2500 | 0° |

D1, D2 and D3: pad 1 is the cathode. All three cathodes face left in the top PCB view. J2: physical pin 1 is BAT+, pin 2 is GND and pin 3 is NTC. TP1–TP3 are bare test pads and are excluded from BOM and placements.

Use `placements-native.csv` and this reference for assembler reconciliation. The generic JLCPCB placement export contains unresolved orientation metadata and is deliberately excluded from the manufacturing package.