Board Bring-Up Plan
HOLD —connected schematic checkpoint, not assembly or flight release
2026-10-08:78 components/68 nets; motor/UART/I2C/powerOR/sense blocks wired. Final repeated ERC12 source-inference errors remain individually justified in interface-and-firmware-gates. No floating-pin errors. PCB not placed/routed;39mm fit and footprints unverified. All tests below are planned unless explicitly recorded as tool simulation.
Before manufacture
- Independently review actual netlist, custom header numbering and schematic readability. Functional Group organization exists; detailed arrangement is blocked by missing editor mutation API.
- Verify STM32LQFP64, ESD array, PTCS and header footprints/physicalpin1. Confirm mounting geometry, connector height and enclosure/stack clearance before layout.
- Build/archive custom firmware with active8MHzHSE bypass and absent-feature disables. Verify USB no-VBUS-sense behavior sincePA9 isUART1TX.
- Complete layout/thermal/DFM/ERC/DRC and independent review. No exports authorized here.
First power
Props removed, ESC/motors/accessories disconnected. Inspect polarity,pin1,short resistance and solder bridges. Use current-limited5V source initially100mA in a suitable USB fixture or J7pin1. J7pin1 ONLYregulated4.75–5.25V, neverLiPo. J7pin3 is sensing-only, NOT power. J2pin1 is3V3sense, not debugger supply.
Measure input,fuse drop,CORE_5V_OR,U4/U5outputs,isolatedVCAP1/2 andNRST. Compare current with180.16mA bounded active allocation; before USB authorization keep2.290909V;30Vmaxratio1%corner->2.777269V;current5V->2.5Vnominal/2.525Vcorner. Cutoffs157.721/265.258Hz;1%settling4.652/2.768ms afterrampstart. Models omitADCload,clamps,regulators andsurges;not hardwarequalification.
ApplyknownDCstimuli onpoweredFC,currentlimit,andcompare measuredADC/VDDAatmultiplepoints. Configure480cyclesampling initially andverifyaccuracy. Calibratevoltage andexternalcurrentsensorslope/offset;donotreusereferencecurrent scale36. CharacterizeESCtransients;30Vscreeningceiling isnot avalidatedsurgerating. Verifypoweredoffinjection/leakage beforeaircraftintegration;addoffboardisolation/transientconditioning ifrequired.
Motor and safety validation
ScopeDShot300outputs to dummyload/testESC withcommonGNDfirst; verifybootlow,arming,failsafe,reboot/powerlossandtiming. NoESC/Motorpowerpasses throughFCsignals. Thenonlytestmotorswithpropsremoved. BidirectionalDShot,flightreadiness,55AESCperformance andOX32supportareNOTestablished.