Covered capacitive-sensing electrodes¶
The current master fits AW96105DNR, with three independent rear electrodes and no exposed manual wire pads. Bridge B is the only permanent island support. See the design reference for the fitted circuit and AW routing checkpoint for initial route evidence; sensing performance remains unqualified.
Three approximately 1mm-wide rear copper strips follow the perimeter, separated by 2mm gaps. The areas below describe the original three-electrode checkpoint; later contour refinements do not establish new measured areas.
| Net anchor | Region | PCB net | Approximate copper area |
|---|---|---|---|
| T1 | Short side | /TOUCH_SIDE_A |
38mm² |
| T2 | Long side | /TOUCH_SIDE_B |
68mm² |
| T3 | Tip | /TOUCH_TOP |
26mm² |
The 2026-10-27 covered-electrode revision removes the former 2.5×1mm oval wire lands and their coverlay openings. Each region retains a 0.8mm copper-only net anchor wholly inside its existing electrode fill, excluded from BOM/CPL. These anchors have neither mask nor paste apertures; the rear tape covers the former access notches. All three anchors are represented in the schematic and routed to the AW: T1 to CS4/pin 9, T2 to CS0/pin 7 and T3 to CS3/pin 8. The 0.127mm feeds have short rear electrode entries and avoid overlap with another rear electrode. The ear connector carries I2C to the AW; it does not carry the raw electrode nets. Close surrounding copper and through-fur performance remain experimental.
The AW generation checks independent region nets, connected copper at each covered anchor and AW terminal, spacing, assembly exclusions and the absence of exported coverlay openings over the entire electrode. Inspect each run's DRC/parity/CAM results; historical checks do not certify a later source snapshot.
Use the AW manufacturing workflow for the rail-free L/R pair below 109mm width, with removable blank moat infill retained through shipping. JLC supplies external panelisation/carriers. The ear-stack contract specifies 0.12mm finished flex and 0.5oz copper per side; supplier handling and actual finished white-coverlay construction still need confirmation.
The 2026-10-23 output checkpoint records the earlier LED-only circuit, isolated-label ERC findings, rounded L/R exports, measured pair bounds and validation evidence. Its unfitted-sensor and two-bridge descriptions are historical.