abse/smartwatch-flex-top-only

qualification/supplier-questions.txt

Unsent technical questions for the already selected parts and enclosure.

Display / Crystalfontz CFAL368448A0-0193DW:
Please confirm that the drawing and connector orientation apply to the exact supplied module. Provide the XY positions and maximum heights of all populated flex parts on both faces, stiffener extents, permitted bend zones, minimum static bend radius, and the assembled folded-flex envelope. The module drawing shows tail width6.00±0.10mm; Hirose FH35C-19S-0.3SHW(50) recommends±0.05mm. Please approve mating tolerance and contact orientation. Confirm worst-case start-up and running current. Our complete enclosure maximum is39×50.5×14.5mm; the module body CAD alone does not demonstrate populated-flex fit.

Flex fabricator / assembler:
Review actual Gerbers, drill files, coverlay, six stiffeners and the twoR3.9mm static bends. Propose a finished4-layer stack with total thickness/tolerance compatible with the modeled0.20mm board. Provide finished copper thickness on each layer, dielectric/coverlay/adhesive data and a50ohm RF impedance calculation using the actual geometry. Confirm nine0.45mm pad/0.30mm drill U1 exposed-land vias can be resin-filled and copper-capped to IPC-4761TypeVII. Confirm stencil windowing and low-profile0201/ACH assembly, including R58's local0.10mm courtyard. Do not substitute ordinary tented thermal vias. L5 Coilcraft0402DC-2N0XJRW requires sourcing/consignment confirmation.

Existing battery / probe harness suppliers:
Retain Adafruit4237 / PKcellLP552530350mAh protected pack and its25.5×32.5×5.7mm maximum modeled body. Confirm actual supplied cell/PCM revision, continuous and pulse current limits, swollen/aged maximum envelope, and factory JST-ACH harness/strain relief. Retain10kΩ B3435 battery NTC specification and selected ACH interfaces. Provide orderable factory-wired probe identifiers, fullR/T curves, tolerances, thermal time constant, dissipation constant, sealed envelope and compatible crimp lead/conductor specification. Confirm the separate receiver-coil probe curve against BQ51013B requirements. No cable is hand-soldered during final assembly.

These questions have not been sent. Supplier answers are required evidence, not inferred approval.

Fabricator capability exceptions to review explicitly: current0.45/0.30mm via geometry;0.127mm minimum copper clearance versus exposed-pad/coverlay rules; filled/capped via process on4-layer0.20mm flex. JLCPCB published flex profile is not an automatic match. Approve an actual stack/process or identify the required manufacturing revision before ordering.