I couldn’t produce a faithful schematic PDF: the available PDF export covers PCB layers only, and the schematic-rendering fallback loses symbol detail. No PDF was created, and your design is unchanged.
I’ll make a cosmetic-only readability pass using the ten requested blocks, left-to-right signal flow and inter-block net labels. I’ll compare the complete netlist, parts and values before and after, and won’t touch PCB layout.
Thought for 1 min 53 sec
9 days ago
Thought for 7 sec
1/3 Capture baseline component/value inventory and complete netlist invariants
Capture baseline component/value inventory and complete netlist invariants
Arrange ten schematic blocks and clean cosmetic wiring/labels without electrical changes
Compare before/after netlist and visually check readability; stop without PCB layout
Thought for 42 sec
Awaiting 1 task
"Schematic Readability Pass" completed.
Thought for 59 sec
flux
9 days ago
The readability pass is blocked: my available controls do not support schematic canvas placement, frames, or graphical wire/net-label editing, so I made no changes.
Before: 328 components / 188 nets.
After inspection: 328 components / 188 nets.
Parts, values and connectivity remain untouched; no PCB layout started.
I cannot claim the rearrangement or a full before/after netlist comparison was completed. This limitation needs Contact Support.
Latest independent revision finding and completed correction
Independent review conditionally accepted the simplified pump/hand sizing/default pulls/TPs/isolation and bench acceptance, but found direct3V3 PWM→TC4427A unsafe when5V=0 (input absolute maximum VDD+0.3V). Corrected now: U6 SN74LVC1T45DBVT dual-supply translator with manufacturer Ioff/either-supply-atGND high-Z protection,3V3A→5VB direction, R23=10k output pulldown and C10/C11=100nF decouplers. SHUTDOWN_RELAY_PULSE/TP4/R2 boundary retained; new SHUTDOWN_PUMP_INPUT_5V drives IC1IN_A. Missing either rail atGND isolates B and defaults IN_A low; partial brownout/ramp remains supervised and bench-tested. Capacitive energy semantics/Q3/health/floating contact unchanged.
Latest inventory54components/14types,25nets,122connected memberships,12TPs,6NCs supersedes50/24 below. TP4=40kHz;TP8 namesQ3 notQ2. ExactC9 procurement explicitly left order-stage. AQY212 LED pins1/2 confirmed but indexed drawing polarity not independently resolved; no rewiring. Full correction evidence, limits and completion matrix in latest addendum of shutdown-design-notes.
Fresh targeted ERC21:00:39.620Z 4Errors, same listed IC1 pins but IN_A now physically driven byU6B and checker-unrecognized library port semantics, not missing MCU directly; VDD/GND future actual source semantics, IN_B grounded same GND issue. D1 1Warning21:03:37.923Z. No targeted floating/power-connection/conflict/NC/single-pin/endpoint findings; missing footprints none. Read-only airwires 97Errors21:04:12.200Z, unrouted/unplaced PCB. No simulation/PCB changes/second independent review; four new parts await later layout. Bench acceptance unchanged/unattempted; C9 procurement deferred and AQY212 polarity confirmation unresolved. Commits83a02988/1a63d77f/64c46ad2. Correction batch completed separately from overall design; user pause waived, lead proceeds Block2 after targeted inspection.
Current revision — user-approved simplification, 2026-10-10
This revision supersedes every older active-dump topology, final-value simulation, fixed 5mA acceptance target, and simulated qualification conclusion below. Older material is retained only as a historical review record. No SPICE or behavioral simulation was called for this revision. The user's subsequent “After this proceed to the next step without review” waives the user-review pause: hand off Block1 to the lead, who will inspect it and separately build Block2 without another confirmation. EE/bench qualification remains mandatory; this worker does not expand into Block2 or layout.
Controlling user review was read in full. Detailed current inventory, conservative hand calculations, control semantics and bench checklist are in the current-revision section of shutdown-design-notes.
Implemented revision and evidence
Removed dump-only Q1, Q2, R7, R8, R10, R19, R20; deleted all four SHUTDOWN_DUMP_* nets. IC1 channel A remains; IN_B is grounded and OUT_B is intentional NC. The datasheet instructs grounding any unused driver input. Unloaded output is an engineering disposition, not an extracted explicit manufacturer instruction.
R9=22ohm1% CRCW251222R0FKEGHP (existing2512/1.5W retained); C1=1uF50V1206 Samsung CL31B105KBHNNNE; C8=1uF50V0805 TDK C2012X7R1H105K125AB; R11=10kohm1%; prototype RELAY_PULSE=40kHz50%duty, stopped by firmware on trip/disarm/not-ready. R1 remains180ohm1%0.5W. The 1.5W R9 package was not shrunk because retaining the footprint is in scope and provides conservative short-load dissipation headroom, not because the normal pump needs high power.
R5=2.2kohm1%: two70kohm-minimum internal MR pullups equivalent35kohm give MR=4.5mA, command<=1ms, static-pulse decay, thermal | Unattempted |No boards; stuck-pin decay acceptance limit was not supplied and must be agreed after measured result. |
| Room-temp output<=10uA | Unattempted |Requires complete assembled output and appropriate leakage instrument/probe loading correction. |
| Block2/layout/readback/simulation | Unattempted |Outside authorization; simulation explicitly prohibited for this revision. |
Commits:8888a611 channel/probe rewiring;9f784a58 seven removals;ea952e22/58b2f26d/277ec1e3/d6f82953 obsolete nets;95e88fbd values/procurement/probe warnings. First TP10 unnamed-pin syntax was rejected without mutation, then UID-qualified pad succeeded; no component defect was introduced.
Historical focused review — superseded topology and simulation acceptance
Draft Checkpoint and Scope
Focused fixes requested by the lead after independent read-only review; no second broad review and no other subsystem or layout edits. The shutdown is a wired draft requiring EE and bench review, not certified protection. Final count remains 57 components, 28 nets, 127 connected pins/net-label stubs, 5 intentional no-connects, 12 testpoints. Component-property commits b001a334 and 9104f0e0 changed values/ratings/procurement annotations only; no connections, packages, positions, board rules or routing changed.
Independent Findings and Requirements Disposition
Table
Finding / requirement
Result and disposition
No definite internal wiring/power-pin error; floating output/default inhibit/pin maps sound
Lead's independent finding retained, not replaced by a new broad review.
Conditional calculation: 5.25/(180×0.99)=29.461mA with zero LED/Q3 drop and reservoir≤5.25V. R1 worst zero-drop continuous power=0.1547W. With verified100ppm/K TCR and ±15°C from25°C, Rmin=177.933Ω and bound29.505mA. Overshoot/transient reservoir maximum, aging and actual rail bounds still need validation. Resistor family100ppm/K/1% ratings are sourced.
Maintain≥5mA LED
Blocked qualification: Vreservoir≥1.5+0.2+0.005×181.8=2.609V under prior testpoint assumptions. Final simulation passes assumed driver≤20Ω but fails30Ω at low rail; TC4427A lacks guaranteed5V loaded output resistance. Do not label30Ω a datasheet maximum or all-temperature acceptance.
R9/R10 pulse and indefinite-inhibit thermal load
Completed candidate procurement: CRCW25124R70FKEGHP/CRCW251210R0FKEGHP,1.5W2512,1%, no substitutes. Family P70=1.5W; R1 HP family P70=0.5W. Numerical pulse-curve extraction conflicts; repetitive/startup pulse acceptance and assembled PCB thermal resistance remain blocked, not certified by family title.
Bias/ripple-qualified pump capacitors
Nominal sourcing completed, qualification blocked: C1 KEMET C1206C475K4RACTU4.7µF16V10%X7R1206; family nominal codes verified. C8 KEMET C0805C225K3RACTU2.2µF25V10%0805,-55…125°C nominal data verified at1kHz/1Vrms. Effective capacitance/ripple/ESR/self-heating/aging limits at actual50kHz are not established; annotated candidates, not accepted production parts.
RELEASE_N boundary
R5=1kΩ requires later release hardware to source≈3.3mA and defaultLOW on reset/upload. Actual reset/Teensy and all required IEPE/analog-rail integration deferred to later blocks.
Trip latch
No hardware trip latch in this block. Firmware must latch trips and deliberately rearm only after cause clears; power/health recovery alone is not firmware permission.
HEALTH_ACK timeout
IC2 nominal9.91232ms, preliminary9.519–10.312ms before TC/aging/interface effects; separate hang detection, expressly outside≤1ms command spec.
≤1ms command-to-contact-open10–40°C
Unqualified: U1 .2ms max is25°C/IF5mA/maxload, not≈0.8mA across10–40°C. Logic/gate delays, Q3 drive-dependent saturation storage and optical tail need bounds/measurement; supervisor20µs assertion is nominal, no MAX. Prior500µs allocations are not guarantees.
TVS and total leakage
D1 conditional SMAJ24CA-Q: max38.9V@10.3A10/1000µs,50.6V@51.5A8/20µs. Latter exceeds U1 recommended48V but is below absolute60V by9.4V under stated pulse conditions. Undefined surge/ESD overshoot/temp/wrong-BNC energy and relay+TVS+PCB≤10µA over10–40°C remain validation gates.
Insulated rear BNC
Drawing31-5486-1010 identifies isolated low-profile50Ωright-angle jack with PBT housing. Retrieved1500Vrms has no identified panel-shell test points. Grounding terminal/hardware/support and actual assembled shell-panel insulation remain unresolved. Investigational candidate only; selection/import/mechanics deferred. X1 remains WAGO internal two-wire connector, NOT BNC. No added off-board hardware.
Existing layout data
Corrected record: provisional/default160×100mm rectangular4-layer board object,57 footprints132pads/onefill/no route segments; component bounds x[-78.43,39.81], y[-155.44,-55]mm. These are unreviewed existing placements, not selected outline/finished layout; untouched.
Final-Value Simulation: Behavioral Sensitivity, Not Qualification
Ngspice ran final R1=180Ω,R9=4.7Ω,R10=10Ω,R11=1kΩ,C1=4.7µF,C8=2.2µF,50kHz50%duty20ns-source-edge model. Topology matches actual capacitor pump, D2ground clamp, D3reservoir rectifier, C8/R11 reservoir shunts, R1/U1LED/Q3series path, R10/Q1dump path. Source4.75/5/5.25V is a planning±5% range; optional4.64V tests low supervisor sensitivity, not a validated supply. Driver0/5/10/20/30Ω is explicitly assumed sensitivity, no guaranteed5V maximum available. Diodes each fixed0.55V+0.1Ω; LED1.5V/Q3closed0.2V; Q1ON10Ω/OFF1GΩ; ideal switch opening; no contact/temperature/ESR/ESL/recovery/current-limit models. Values from prior device testpoint evidence are not simultaneous10–40°C bounds. Reduced2.35/1.1µF and high5.17/2.42µF are assumptions, not proven capacitance limits.
Normal Run and Low-Rail Corners
Measurements over19.8–20ms. AdverseR1=181.8Ω,R9=4.747Ω,R11=990Ω; nominal/reduced caps. All cases with assumedRdriver≤20Ω passed instantaneous5mA. At4.75V/Rdriver20Ω/reduced caps minimum5.688mA; atoptional4.64V minimum5.333mA. At30Ω/4.75V nominal/reduced minima4.829/4.721mA; at4.64V minima4.517/4.414mA. Thus credible sensitivity exists, guaranteed minimum does not. Highest reported final normal-current maximum11.908mA at5.25V/0Ω/nominal caps; zero-drop algebraic upper bound addresses an additional conservative envelope.
At5.25V/0Ω driver, idealQ3 opening at5ms reduces LED to≤2.42nA immediately in the model; dump starts20µs later. This proves the modeled series interruption, not physical command/contact timing. Continued PWM replenishes C8: final reservoir nominal1.786–2.253V, reduced1.419–2.272V, high1.819–2.246V; dump is not a complete zero-voltage discharge while pumping. Because Q3 is OFF, that residual does not maintain LED drive in the ideal model.
Pulse stuckHIGH/LOW at5ms with Q3ON/dumpOFF, phases0/5/10/15µs, R11=1010Ω: worst tested LED<0.4mA delay2.386msHIGH/0.74176msLOW, high caps. These are fault-decay estimates, not commanded trip delay or guaranteed contact times. Healthy ACK alone cannot supply steady pump energy. C1 remains charged with staticHIGH even once LED off. High-cap maximum startup stored energy19.492µJ; highest sampled stuckHIGH stored energy49.222µJ at20ms is not an infinite-time bound.
Power loss sourceLOW/Q3OFF/dumpOFF retains reservoir voltage; at10ms after start (5ms after loss) nominal0.3911V/high0.4816V. Series cutoff avoids putting this passive bleed on the command critical path. Full timing traces are within the complete analysis; simulator supplied unsigned historical CDN trace pointers with uncertain future access, so do not represent their retention as permanent archival proof.
Indefinitely Continuing PWM During Inhibit
Q3OFF/Q1ON fromstartup;5.25V, steady19.8–20ms. Waveform-integrated values, not averaged-current guesses:
Zero-loss startupR9peak5.848W/1.115A, energy132.615µJ first200µs; R10startuppeak0.5324W. Fixed-drop nominalstartupR9peak4.495W/0.978A,54.109µJ first200µs. These numerical powers/energies require explicit manufacturer pulse-curve comparison and PCB thermal test, not merely1.5W labeling. At5.25V/-1%R9 ideal algebraic current≤1.128A absent negative initial capacitor voltage/overshoot, still conditional.
Fixed-drop nominalQ1power≈0.106W, no junction-rise guarantee. InhibitC1voltage1.347–1.792V/C8voltage1.787–2.254V; zero-lossC1=1.315–2.070V/C8=1.316–2.086V. Bias is within nominal voltage ratings but rating does not prove capacitance or ripple heating. Required manufacturer acceptance targets include at least modeled C1≈0.362Arms/C8≈0.188Arms at50kHz with margin and real waveform, plus startup. Inhibit thermal/netlist/traces,compact data.
No temperature claim follows from changing a SPICE temperature variable on ideal fixed-drop parts. Limits over10–40°C require vendor bounds or measured qualification. Do not claim a datasheet-bounded conservative minimum LED model where driver5V resistance and diode/cap limits are not bounded.
Exact ERC Interpretations and Checks of Fixes Only
Post-property targeted readback verified R1=180Ω0.5W0805 and R9/R10=4.7Ω/10Ω1.5W2512 with exactMPNs/no substitutes; packages and six associated pin-net memberships unchanged. C1/C8 candidate annotations preserve values/packages and connectivity. Fresh targeted ERC at2026-10-10T17:40:55Z retained 4 Errors,1 Warning:
Table
Exact finding
Interpretation; not suppressed
IC1:IN_A not driven by any output
Connected SHUTDOWN_RELAY_PULSE boundary withR2/TP4; future MCU source absent, NOT dangling.
IC1:VDD not driven by any output
Connected5Vboundary, future power source absent.
IC1:GND not driven by any output
Connected localGND network; no power-output source declared, NOT unconnected ground.
Warning is library semantics for bidirectionalTVS, not a detected floating net/polarity reversal. Actual surge/leakage qualification remains independent.
No fake sources/power flags/pin-type overrides were added to hide these. Error=wrong according to checker and remains open; its engineering cause is explicitly documented, not automatically a dangling connection. Warning=possibly wrong pending review; Info=noteworthy. This is not clean ERC or board-release status.
Assigned Batch Completion
Completed: safer LED upper-current envelope revision; concrete pulse-resistor procurement annotations; final-value behavioral normal/trip/static/power-loss/continuous-inhibit evaluation; boundary/no-latch/timeout/timing/TVS limitations; exact ERC interpretation and existing-layout correction; targeted readback and project-file verification.
Failed to qualify / blocked: guaranteed≥5mA LED, resistor repetitive pulse and PCB thermal acceptance, bias/ripple-qualified capacitor envelope, guaranteed≤1ms10–40°C contact release, surge coordination and≤10µA total output leakage. Specific missing facts/models above; no false guarantees.
Deferred/unattempted: actual insulated rearBNC import/mechanical stack/isolation test; physical fault-injection/bench/EE approval; power/reset/all-rail integration, other subsystems, layout and power-loss logging. No new readback or second optocoupler.
Stop here as a wired shutdown draft. Overall hardware, safety and manufacturing completion are separate and not claimed.
Latest independent revision finding and completed correction
Current revision — user-approved simplification, 2026-10-10
Implemented revision and evidence
Read-only verification, not qualification
Completion matrix and open acceptance
Historical focused review — superseded topology and simulation acceptance
Draft Checkpoint and Scope
Independent Findings and Requirements Disposition
Final-Value Simulation: Behavioral Sensitivity, Not Qualification
Normal Run and Low-Rail Corners
Command Trip, Static Pulse Faults and Power Loss
Indefinitely Continuing PWM During Inhibit
Exact ERC Interpretations and Checks of Fixes Only