AnasSarkiz/NEMA14_CH32X035G8U6

docs/sources.md

> Historical baseline document: this predates the opposite-edge v1.11.0 draft. See [current draft and blockers](opposite-edge-review.md) for current evidence.

# Sources and evidence

- Motor requested by user: https://www.omc-stepperonline.com/nema-14-bipolar-0-9deg-11ncm-15-58oz-in-0-4a-10v-35x35x28mm-4-wires-14hm11-0404s . Manufacturer drawing verified: https://www.omc-stepperonline.com/download/14HM11-0404S.pdf . It confirms 0.40 A/phase, 25 Ω ±10%, 24 mH ±20%, 0.9° steps, and front-face 26 ±0.2 mm M3 mounting pitch. Rear attachment dimensions are absent.
- Official WCH SDK: https://github.com/openwch/ch32x035 . Its Snake board embeds a CH32X035G8U6 symbol and QFN28/4×4/0.4/2.6×2.6 footprint.
- Current KiCad symbols: https://gitlab.com/kicad/libraries/kicad-symbols , inspected revision `e1bb0a65cb243525367c5dc7294665b9fd57fc4d`; `MCU_WCH_RiscV/CH32X035G8U6` and `Interface_USB/CH224K` establish pin mapping and package selection.
- Current KiCad footprints: https://gitlab.com/kicad/libraries/kicad-footprints ; `SSOP-10-1EP_3.9x4.9mm_P1mm_EP2.1x3.3mm` and `SOT-89-3` establish the corrected PD and regulator land dimensions.
- Published PD reference: https://github.com/tomorrow56/CH224K_PDDecoy , `toragi/img/04_Schematics.png` independently confirms CC1 pin7 / CC2 pin6. https://github.com/UNIT-Electronics-MX/unit_proto_power_delivery_decoy_ch224k at `36e92b99cba94163813b383ca9a16cd6f7f6ef62` documents CFG1/2/3 = 0/1/1 for 15 V.
- Driver package/pin reference: https://github.com/adafruit/Adafruit-A4988-Breakout-PCB at `f10f6b1d10aeeabc7a4a3445b81925c0a51d0e45`, Eagle A4983_LOGICAL / QFN28_5MM used on that A4988 carrier. Manufacturer A4988 electrical accuracy/rating review remains required before release. Current pads and models come from the genuine JLCPCB import, not this reference footprint.
- USB footprint: https://github.com/KiCad/kicad-footprints/blob/master/Connector_USB.pretty/USB_C_Receptacle_HRO_TYPE-C-31-M-12.kicad_mod . Converted to TSX using the current tscircuit CLI; physically shared USB pads are represented once.
- Freerouting fallback: https://github.com/freerouting/freerouting/releases/tag/v2.0.1 ; Java21-compatible release JAR downloaded over verified HTTPS. The unsupported GUI-only 1.9.0 attempt was abandoned.



Current fitted parts are genuine JLCPCB imports obtained with `tsci import --jlcpcb --download --use-exact-footprint <C-number>`. `src/jlcpcb-catalog.json` records component-to-part mapping, original import hashes and native OBJ/STEP hashes. No fitted part uses a custom replacement footprint. Earlier KiCad/Eagle references establish pin cross-checks only; they do not define the current supplier land patterns.

Current tools: tscircuit 0.0.2764, CLI 0.1.2261, pinned in the lockfile. WCH evaluation-board reference section 5 documents PC17-high cold-start ROM USB programming. RP2040 and AP63203 manufacturer PDFs used for power/boot/reference checks are cached in the RP2040 project's `references/` directory. The AP63203 PDF is DS41326 Rev 3-2, November 2024, including the fixed-output pin map and PCB layout guidance. Additional direct Allegro/Raspberry Pi document retrieval during this review returned HTTP 403; no new manufacturer qualification is claimed from those failed requests.