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20261006-1156-air-hub-highest-certification-level Develop Air Hub to the strictest certification levels with chip-down radios and re-check the design

  • status: completed
  • createdAt: 2026-10-06 11:56
  • approvedAt: 2026-10-06 11:56 (owner: "看看是否符合emc和安全认证 按最高级别产品认证要求开发 用芯片不用模组")
  • relatedTask: 20261006-1156-air-hub-highest-certification-level

Context

章节标题：“Context”

Spec R1.2 carries REG-01…05 at the levels of EN 301 489-1 with IEC 60945 as a voluntary target, and AIR-O-14 left three choices open: chip or pre-certified module for EFR32MG21, target markets, the US 433 MHz antenna interface. The assessment listed A-class schematic gaps: no EMI filter at the harness terminal, a 600 W input TVS, no ESD protection at the SMA port, the Ethernet shield bonded straight to ground, a fuse without a stated DC breaking rating. The Pro first board was placed and routed by script; its EMC rule check gave 87 findings.

The owner now decides: chip-down, strictest certification level.

Proposal

章节标题：“Proposal”
  1. Spec R1.3: REG-01…05 move to the strictest of EN 301 489-1 / EN 55035, IEC 60945 and IACS UR E10 (ESD ±8 kV contact / ±15 kV air, 10 V/m, EFT ±2 kV / ±1 kV, surge, 10 V conducted RF), ISO 7637-2 level IV and ISO 16750-2 load dump test A on the supply, IEC 60945 emission limits as a requirement, safety with a CB report and an NRTL listing for North America, V-0 materials; new REG-06 marine environment (IEC 60945 protected equipment); AIR-O-14 records chip-down and one reverse-polarity SMA for all SKUs and keeps markets, lab plan and the optional class type approval and ignition-protection questions open. BOM figures follow the added parts.
  2. hub_common.py (both boards): 2 A time-lag fuse with DC rating, 5 kW TVS, −60 V P-FET, common-mode choke plus pi filter, 100 V bulk capacitor; RC termination of the RJ45 shield; ESD suppressor at the 433 MHz port and RP-SMA.
  3. gen_hub_pcb.py: anchors addressed by functional group and value so added parts do not shift them; board 110 x 102 mm; ESD parts placed at their connectors; hub_stitch.py adds a ground return via next to signal vias. Re-route Air Hub Pro and re-run the EMC rule check.
  4. Docs: evaluation (levels, what is fixed, re-check), reference-board page (circuit, part list, BOM, board), guide, changelog, task and plan.

Risks

章节标题：“Risks”
  • The strictest levels are development targets chosen from published standards, not a lab's test plan; a lab may regroup or relax some of them.
  • Differential-pair matching, RF trace impedance and shield cans cannot be delivered by the automatic placement and routing flow; they remain manual layout work.
  • Added input parts raise the BOM of an entry product that is already above its cost cap.

Scope

章节标题：“Scope”

Workspace: hub_common.py, gen_hub_pcb.py, hub_stitch.py, both regenerated projects, the Pro board and exports. Docs: spec, guide, evaluation, reference-board page, changelog, task / plan.

Alternatives

章节标题：“Alternatives”
  • Pre-certified EFR32MG21 module: rejected by the owner.
  • Keep EN 301 489-1 levels and treat IEC 60945 as voluntary: rejected by the owner.

Annotations

章节标题：“Annotations”
  • 2026-10-06: "用芯片不用模组" is read as the answer to the EFR32MG21 question; replacing the ESP32-C6 module or the core boards with chip-down designs is not in scope and would be a separate decision.