Temperature and Humidity Sensor Node Design
0:29
Thought for a moment
0:20
Thought for a moment
VCM_1V25 ao redor de U2 IN-. Antes de rotear, vou tentar limpar os alertas dos pads EP de U3/U4 para não contaminar o roteamento, depois verifico o resultado com a revisão da placa.4:38
Thought for 4 sec
1/4 Revalidar sobreposição EP em U3/U4 e estado de roteamento
Thought for 4 sec
Completed 3 design checks — found 113 issues.
Read layout.
Thought for 13 sec
Thought for 3 sec
Thought for 11 sec
Editing layout rules.
Thought for 9 sec
2/4 Corrigir/suprimir corretamente os pads EP/mounts internos de U3/U4
Thought for 5 sec
Completed design_rule_check_overlapping_copper check — found 113 issues.
Completed design_rule_check_dangling_trace check — found 113 issues.
Read layout.
Thought for 28 sec
Thought for 8 sec
Thought for 13 sec
Completed design_rule_check_overlapping_copper check — found 113 issues.
Thought for 7 sec
Editing layout rules.
Thought for 5 sec
Completed design_rule_check_overlapping_copper check — found 113 issues.
Completed design_rule_check_airwires check — found 113 issues.
Read layout.
Thought for 14 sec
Editing layout rules.
Thought for a moment
16:30
Thought for 10 sec
3/4 Executar roteamento disponível para conectar VCM_1V25 e preservar região de guarda WE
Thought for 10 sec
Routing complete!
Thought for 3 sec
Completed 4 design checks — found 43 issues.
Read layout.
Read layout.
Thought for 45 sec
Thought for 15 sec
4/4 tasks completed.
Thought for a moment
VCM_1V25 foi incluída no roteamento global, mas a ferramenta disponível não garante uma geometria de anel de guarda manual ao redor de U2 IN-; deixei a área marcada no silk para inspeção/ajuste manual.- Board resized from the default 160 × 100 mm to an 80 × 60 mm compact industrial outline with 2 mm rounded corners.
- Stackup kept as 4 layers and configured with an internal ground-plane priority to improve analog return paths and EMI performance.
- Components were re-placed by functional block:
- Left edge: sensor connector J2 and low-noise AFE.
- Left/quiet analog region: U2 LMP7721 TIA, U3 potentiostat, R7/R8/R9/R10/R11, RV1, C11, C12.
- Center: reference and analog signal conditioning, including U5, U4, RV2, and precision resistor/filter network.
- Right edge: loop connector J1.
- Right/power region: loop protection, LDO, current sink, Q1, R12/R13/R14, and input filtering.
- Added a silkscreen dashed rectangle and label around the WE/TIA region:
VCM GUARD: route around WE / U2 IN-.
- Route J2 Pin_1 -> R8 -> U2 IN- as the shortest possible top-layer trace.
- Route a VCM_1V25 guard trace/ring around the WE/TIA summing node and around U2 IN- / R8 / C11 / RV1.
- Keep the guard on the same layer as the WE trace where possible.
- Avoid vias on WE unless absolutely unavoidable.
- Keep RAW_LOOP_PLUS, LOOP_PLUS, MOS_GATE, Q1, and TVS/current-sink copper away from the guard/WE area.
- Placement completed with all components in-bounds and no component overlap reported by the placement engine.
- Sensor/AFE and power/current-sink blocks are physically separated across the board.
- Q1 was placed on the right-side power region with open surrounding board area for copper heat spreading.
- J1 and J2 are on opposite board edges, improving separation between field loop wiring and sensor wiring.
- The available router was run after the user requested routing of the WE guard in VCM_1V25.
- It completed successfully and added 397 routing nodes.
- The router available in this session is the global auto-router, not a manual single-net guard-ring router. Therefore it can connect the VCM_1V25 net but cannot guarantee a true driven guard ring geometry around U2 IN-.
- A visual/manual pass is still required to confirm the guard ring shape and, if necessary, draw the VCM_1V25 guard trace manually around U2 IN-.
- U3/U4 still report overlapping copper at EP against internal footprint mount pads.
- Attempts were made to deactivate or remove the redundant internal mount pads, but the layout editor did not accept those internal node edits by UID/selector in this session.
- The overlap appears to be caused by footprint-internal mount pads overlapping the real exposed pad, not by component placement overlap.
- This remains a manufacturing-blocking issue unless verified as same-net intentional copper or fixed by editing/replacing the footprint.
- Remaining issues include unresolved U3/U4 EP internal footprint overlap.
- Airwire status after auto-routing should be checked before manufacturing export.
- Do not fabricate/export manufacturing files until routing and final DRC are clean.
- Verify the VCM_1V25 path near U2 visually; create/adjust a true guard ring around U2 IN- if the auto-router did not produce one.
- Resolve U3/U4 EP footprint-internal overlap by footprint edit/replacement or verified same-net acceptance.
- Re-run DRC for airwires, overlapping copper, dangling traces, and clearance.
- Only then proceed to manufacturing export.
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