{ "revision": "A2 band · M4 housing · D2 dock", "designDate": "2026-10-23", "electronicsEvidenceDate": "2026-10-21", "mechanical": { "features": { "continuous_jacket_width_mm": 8.5, "jacket_min_radial_wall_mm": 0.319718, "jacket_bond_gap_mm": 0.08, "trim_min_radial_wall_mm": 0.23, "exposed_edge_radius_mm": 0.12, "central_bore_mm": 19, "entry_bore_mm": 19.9, "mic_hole_count": 7, "mic_hole_diameter_mm": 0.35, "mic_open_area_mm2": 0.6734789251133119, "mic_guard_to_membrane_min_gap_mm": 0.09807821940563252, "outer_jacket_min_package_gap_mm": 0.18463864253031234 }, "intersections": [], "referenceDrift": [], "audit": { "revision": "A2-M4 / D2 compatibility", "cad_sha256": "a0d5363ef8001226914fa2446062260c1786c695887ba4f07d573c0ef985d08d", "solid_count": 80, "dock_intersections": [], "central_bore_intrusions": [], "outside_envelope": [], "dock_minimum_guide_radial_clearance_mm": 0.2, "mic_membrane_to_switch_gap_mm": 0.09000000000000018, "limits": "Nominal CAD only. Dock clamp, contact force, tolerance accumulation, acoustics, RF, sealing, surface finish and wear have not been physically tested." } }, "dimensions": { "bore": 19, "outside": 27.1, "width": 10.2, "radial": 4.05, "flexLength": 49.313724, "flexWidth": 9, "flexThickness": 0.12 }, "checks": { "native_drc_errors": 0, "native_drc_warnings": 0, "unconnected_items": 0, "erc_violations": 0, "schematic_pins_checked": 159, "pcb_footprints": 50, "fitted_components": 39, "via_count": 93, "via_pad_drill_overlap_hits": 0, "flex_rule_violations": 0, "cad_intersections_and_intrusions": 0, "formed_flex_solids": 1, "firmware_interface_errors": 0, "sent_battery_inquiry_hashes_match": true }, "dockChecks": { "erc": 0, "opens": 0, "drc_findings": 0, "minimum_USB_ground_to_NPTH_gap_mm": 0.2918767828, "source_connected_pins": 31, "source_errors": 0, "cad_ring_and_assembly_intersections": 0, "qualification": "Custom land offset requires supplier/first-article solder inspection; physical charging tests not performed" }, "optical": { "revision": "A2-M3", "sensor": "MAX30102", "native_side": "B", "native_angle_deg": 0, "source_outline": "21-1048 Rev B in Maxim MAX30102 Rev0 p32; pin orientation p8", "source_url": "https://orwintech.com/static/user/datasheet/MAX30102.pdf", "apertures": [ { "name": "PD", "center_local_y_mm": -0.822, "package_aperture_mm": [ 1.97, 2.75 ], "clear_window_mm": [ 2.17, 2.95 ], "clear_edge_allowance_mm": 0.1 }, { "name": "LED", "center_local_y_mm": 1.64, "package_aperture_mm": [ 1.97, 1.094 ], "clear_window_mm": [ 2.17, 1.294 ], "clear_edge_allowance_mm": 0.1 } ], "central_opaque_bridge_mm": 0.24, "window_sensor_face_normal_radius_mm": 9.7, "installed_seal_height_at_max_package_mm": 0.240000000000002, "package_height_range_mm": [ 1.45, 1.65 ], "actual_assembly_gap_acceptance_mm": [ 0.15, 0.5 ], "registration_budget_mm": { "SMT_to_carrier": 0.04, "insert_to_carrier": 0.02, "aperture_measurement": 0.02, "total_worst_case": 0.08, "clear_window_residual": 0.02 }, "seal_process": "Measure each soldered sensor face and aperture registration; fit and dispense on frame in alignment fixture, room-temperature cure before battery installation. Inspect bleed, continuity, optical attenuation and seal. Do not clamp the glass or assume a fixed gasket compression.", "status": "CAD separation complete; reference aperture dimensions require first-article metrology, black materials require measured red/IR opacity, no optical or waterproof performance established" }, "parts": [ { "ref": "U1", "value": "ISP1907-HT-RS", "footprint": "RohanRing:ISP1907_HT", "pins": { "1": "GND", "2": null, "3": null, "4": null, "5": null, "6": "SCL", "7": "GND", "8": null, "9": null, "10": null, "11": null, "12": null, "13": "RESET", "14": "GND", "15": null, "16": "GND", "17": null, "18": "GND", "19": null, "20": "MODULE_RF", "21": "GND", "22": "MODULE_RF", "23": "GND", "24": "GND", "25": "GND", "26": "V1V8", "27": null, "28": "SWDIO", "29": null, "30": "SWCLK", "31": "GND", "32": "SDA", "33": null, "34": null, "35": null, "36": "PDM_DATA", "37": null, "38": "CHG_ENABLE", "39": null, "40": "VBAT_SENSE", "41": null, "42": "CHG_PG", "43": null, "44": "BUTTON", "45": null, "46": "REC_LED", "47": "PDM_CLK", "48": null, "49": null, "50": null, "51": null, "52": null, "53": null, "54": null, "55": null, "56": null, "57": null, "58": null, "59": null, "60": null, "61": null, "62": null }, "x": 4.5, "y": 4.5, "angle": -90, "side": "F", "section": "Radio", "mpn": "ISP1907-HT-RS", "dnp": false, "island": 0 }, { "ref": "C7", "value": "1u", "footprint": "Capacitor_SMD:C_0402_1005Metric", "pins": { "1": "V1V8", "2": "GND" }, "x": 8.4, "y": 5.3, "angle": 90, "side": "B", "section": "Radio", "mpn": "GRM155R60J105KE19D", "dnp": false, "island": 0 }, { "ref": "R2", "value": "4.7k", "footprint": "Resistor_SMD:R_0402_1005Metric", "pins": { "1": "V1V8", "2": "SCL" }, "x": 13.2739, "y": 8.35, "angle": 0, "side": "F", "section": "Radio", "mpn": "RC0402FR-074K7L", "dnp": false, "island": 1 }, { "ref": "R3", "value": "4.7k", "footprint": "Resistor_SMD:R_0402_1005Metric", "pins": { "1": "V1V8", "2": "SDA" }, "x": 33.411499, "y": 5.2, "angle": 0, "side": "B", "section": "Radio", "mpn": "RC0402FR-074K7L", "dnp": 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"end": 28.54645227415097, "length": 7, "apothem": 11.65, "angle_deg": 100.1 }, { "index": 3, "start": 32.411506431609304, "end": 40.411506431609304, "length": 8, "apothem": 10.6, "angle_deg": 154.8 }, { "index": 4, "start": 43.313724189085384, "end": 49.313724189085384, "length": 6, "apothem": 11.4, "angle_deg": 203.70000000000002 } ], "bends": [ { "start": 9, "end": 12.173902662238875, "arc_start": 10.17927618238761, "arc_end": 11.86631143736533, "radius": 1.8, "angle_deg": 53.7, "lead_in": 1.1792761823876114, "lead_out": 0.3075912248735463 }, { "start": 18.373902662238876, "end": 21.54645227415097, "arc_start": 19.781304193755318, "arc_end": 21.239003185020984, "radius": 1.8, "angle_deg": 46.4, "lead_in": 1.4074015315164434, "lead_out": 0.3074490891299848 }, { "start": 28.54645227415097, "end": 32.411506431609304, "arc_start": 28.85475915475574, "arc_end": 30.57321033626936, "radius": 1.8, "angle_deg": 54.7, "lead_in": 0.30830688060477207, "lead_out": 1.8382960953399454 }, { "start": 40.411506431609304, "end": 43.313724189085384, "arc_start": 41.47424949475009, "arc_end": 43.0104883023555, "radius": 1.8, "angle_deg": 48.9, "lead_in": 1.0627430631407893, "lead_out": 0.30323588672988355 } ], "outline": [ [ 0, 0 ], [ 49.313724189085384, 0 ], [ 49.313724189085384, 9 ], [ 0, 9 ] ], "width_mm": 9, "bore_mm": 19, "module_antenna_keepout_x_mm": [ 0, 4.5 ], "battery": "GRP170722 4.20V 14.5mAh candidate; controlled curved drawing pending", "free_angular_sector_deg": 117.75049364507153 }, "interfaces": { "microphone": { "pcb_drill_xy_mm": [ 14.5599, 3.2 ], "pcb_drill_diameter_mm": 0.6, "radial_duct_diameter_mm": 0.8, "membrane_seat_diameter_mm": 2.7, "source": "Infineon IM69D128S datasheet section 6", "part": "GAW3481.02.6", "seat_diameter_mm": 2.7, "vent_thickness_mm": 0.23, "seat_normal_radius_mm": 12.95, "protective_grille": "Seven 0.35 mm holes; curved 0.12 mm PC guard; acoustic qualification required" }, "button": { "source": "https://industry.panasonic.com/global/en/products/control/switch/light-touch/number/evqp7a01p", "direction": "+axial; press toward -Z", "supplier_height_mm": 1.35, "reserved_height_mm": 1.45, "nominal_travel_mm": 0.2, "nominal_rest_gap_mm": 0.1, "boot_flange_compression_percent": 20, "stop_stroke_mm": 0.35 }, "optical": { "revision": "A2-M3", "sensor": "MAX30102", "native_side": "B", "native_angle_deg": 0, "source_outline": "21-1048 Rev B in Maxim MAX30102 Rev0 p32; pin orientation p8", "source_url": "https://orwintech.com/static/user/datasheet/MAX30102.pdf", "apertures": [ { "name": "PD", "center_local_y_mm": -0.822, "package_aperture_mm": [ 1.97, 2.75 ], "clear_window_mm": [ 2.17, 2.95 ], "clear_edge_allowance_mm": 0.1 }, { "name": "LED", "center_local_y_mm": 1.64, "package_aperture_mm": [ 1.97, 1.094 ], "clear_window_mm": [ 2.17, 1.294 ], "clear_edge_allowance_mm": 0.1 } ], "central_opaque_bridge_mm": 0.24, "window_sensor_face_normal_radius_mm": 9.7, "installed_seal_height_at_max_package_mm": 0.240000000000002, "package_height_range_mm": [ 1.45, 1.65 ], "actual_assembly_gap_acceptance_mm": [ 0.15, 0.5 ], "registration_budget_mm": { "SMT_to_carrier": 0.04, "insert_to_carrier": 0.02, "aperture_measurement": 0.02, "total_worst_case": 0.08, "clear_window_residual": 0.02 }, "seal_process": "Measure each soldered sensor face and aperture registration; fit and dispense on frame in alignment fixture, room-temperature cure before battery installation. Inspect bleed, continuity, optical attenuation and seal. Do not clamp the glass or assume a fixed gasket compression.", "status": "CAD separation complete; reference aperture dimensions require first-article metrology, black materials require measured red/IR opacity, no optical or waterproof performance established" }, "recording_indicator": { "ref": "D1", "lightpipe_diameter_mm": 0.8, "led_face_gap_mm": 0.05, "status": "Must remain clear of opaque exterior finishes; visibility and sealing unqualified" }, "sealing": { "revision": "A2-M4", "materials": { "shell_and_carrier": "Unfilled polycarbonate, CNC for five prototypes; clear bonding regions until cure, opaque finish after cure. Supplier to identify traceable skin-contact grade; no printed resin against skin.", "window": "Clear optical-grade polycarbonate; polished skin and sensor faces; no opaque coating over optical aperture", "boot_and_duct": "Platinum-cured LSR, nominal Shore A 40; molded prototype parts, post-cure and extractables/skin compatibility review required", "adhesive_candidate": "LOCTITE AA 3926 for PC-to-PC, PC-to-window and metal-feedthrough bonds; actual cure/adhesion/leak process must be validated", "contact": "C260 brass or C110 copper, 0.20 mm formed tail, nickel underplate 2.5 um minimum and hard gold 0.75 um minimum on mating face; not a nickel-free claim", "optical_frame": "Opaque polycarbonate insert with separate PD/LED windows; 660/880 nm OD >= 3 at minimum 0.24 mm web is a qualification target, not established performance", "optical_fip_seal": "Opaque two-part addition-cure silicone, room-temperature cure before cell installation; select actual grade by adhesion, cure compatibility, 660/880 nm opacity and extractables testing. Do not substitute a transparent sealant or UV-only cure in shadowed gap." }, "cure": "Clear PC bonding regions until cure verification; opaque finish afterwards", "note": "Bond solids show intended installed adhesive volumes, not a validated process. No IP rating." }, "dock": { "contacts": [ "TP5 DOCK_5V", "TP6 GND" ], "pcb_land_pitch_mm": 1.5, "external_pitch_mm": 2.8, "pad_size_mm": [ 1.8, 1.8 ], "contact_positions": [ { "pcb_ref": "TP5", "name": "Dock_Positive", "center_mm": [ -8.57996583496085, 8.071352626523874, 5.1 ], "normal": [ 0, 0, 1 ] }, { "pcb_ref": "TP6", "name": "Dock_Ground", "center_mm": [ -9.772147851343053, 5.5378368796190225, 5.1 ], "normal": [ 0, 0, 1 ] } ], "external_face_z_mm": 5.1, "tail_thickness_mm": 0.2, "alignment_key_xy_mm": [ -11.076104275996167, 3.0016518897532807 ], "alignment_key_diameter_mm": 0.8, "alignment_key_depth_mm": 0.25, "pogo": "Harwin P70-2000045R, 3.6 mm free / 2.9 mm nominal working height; design at 3.00 +/-0.05 mm within 2.85..3.10 mm limits", "status": "Custom plated contact with bonded feedthrough; dry charging only, assembly and electrical tests required" } }, "dock": { "workingHeight": 3, "tolerance": 0.05, "alignment": { "edge_margin": 0.45, "pin_position": 0.15, "nest": 0.1, "board_location": 0.05, "formed_contact": 0.05, "remaining": 0.1 } }, "firmware": { "flash": 189676, "ram": 50260, "flashAvailable": 499712, "ramAvailable": 131072, "clipLimit": 5000, "healthWindow": 20000, "consentWindow": 3000 }, "gates": [ "Controlled battery geometry, tabs, swelling and electrical limits", "Flex stackup, fine mask/coverlay, two-sided assembly and panel approval", "Exact component allocation, complete assembly scope and quotations", "Optical materials, crosstalk, sealing, RF and wear validation", "M4 thin-wall manufacture, finish durability, grille acoustics and comfort trials" ], "sources": { "hardware/ring-a2-band/ring-a2-band.kicad_pcb": "ba3a7111e8b6c6205bbcfc28f48a7c3fba184a9156decffd5090cb6cfd41ef13", "hardware/ring-a2-band/ring-a2-band.kicad_sch": "1e0616df83eaf1e44046dbf204574d342794162ff6535ba547e5b24a21071e54", "hardware/ring-a2-dock/ring-a2-dock.kicad_pcb": "63241b98c200d591a27194270e94fdb15323cda3aa34c537ee0317d6b27d2b02", "mechanical/a2-m4/zenithra-ring-m4.FCStd": "a0d5363ef8001226914fa2446062260c1786c695887ba4f07d573c0ef985d08d", "firmware/core/ring_app.c": "daf4856d0e174b34cdb5f641aa24ac65e7560abd4cfaadae686b4a763768cae5", "firmware/include/ring_app.h": "3ca2435843cb96c2432bf9079d70e248569dce8908588d655ad1c5d83c75637d" } }