Embedded AI Processor Recommendation

flux

The schematic PDF is readable and shows several important differences from the current Flux design, including added DW01A/FS8205A battery protection and an AT2659 RF stage. The STEP file did not load in the first inspection, so I’m retrying the mechanical review separately while verifying the current Flux layout and stack-up.

flux

Review started but is blocked because no ACUs are currently available.
Completed:
  • Inspected the schematic PDF and extracted its major circuits, components, and nets.
  • Flagged preliminary concerns: limited USB protection, charging-only USB implementation, power-tree/current-capacity validation, RF-layout dependence, and incorrect U10 inductor designator.
  • Confirmed the PDF includes DW01A/FS8205A battery protection and AT2659 RF circuitry not reflected in the current Flux BOM.
Remaining:
  • Inspect the STEP model and physical placement.
  • Verify the current Flux schematic, footprints, stack-up, keepouts, and DRC state.
  • Complete power, signal, RF, thermal, and manufacturability analysis.
  • Generate the production-readiness review report and rating.
No project changes were made.
Retry full review
List mismatches
Inspect STEP placement
Check missing circuits

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BOM / Footprint Cleanup Report
Date: 2026-07-06 Project: AI Spectral Reflectance Analyzer Scope: Pre-layout cleanup only. No PCB placement or routing was started.
Summary
Performed the approved pre-layout cleanup pass for the Rev A schematic. The prior manufacturing issue set contained 34 missing manufacturer part number findings across generic capacitors, resistors, inductors, and 1x4 connectors. Real manufacturer/MPN metadata was assigned to the affected parts, and component-level pre-layout constraints were added for the boost converter, buck regulator, charger/power path, GPS RF path, LED-ring current path, and modular optical-head isolation.
Cleanup Applied
Capacitors
Assigned Murata MLCC MPNs to C1-C17 according to schematic value, package, and voltage requirement:
  • 10uF 0805, 10V-class: Murata GRM21BR61A106KE19L
  • 22uF 0805, 6.3V/10V-class rail bulk: Murata GRM21BR60J226ME39L
  • 100nF 0603: Murata GRM188R71H104KA93D or GRM188R71C104KA01D depending voltage role
  • 2.2uF 0603: Murata GRM188R61A225KE34D
  • 47nF 0603: Murata GRM188R71C473KA01D
  • 1uF 0603: Murata GRM188R61C105KA93D
All capacitor substitutions are allowed only where electrical value, dielectric, voltage rating, package, and DC-bias effective capacitance remain appropriate.
Resistors
Assigned Yageo 0603 1% MPNs for CC pull-downs, I2C pull-ups, feedback, compensation, and configuration resistors:
  • 5.1k: RC0603FR-075K1L
  • 4.7k: RC0603FR-074K7L
  • 178k: RC0603FR-07178KL
  • 56k: RC0603FR-0756KL
  • 100k: RC0603FR-07100KL
  • 43.2k: RC0603FR-0743K2L
Assigned Vishay CRCW08051R50FKEA for R12/R13 1.5Ω LED current-sense resistors. These remain Rev A optical-current placeholders and should be rechecked after LED-current testing.
Inductors
  • L1 TPS61088 boost inductor: Würth 744311150, 1.5uH, shielded, high-current, low-DCR candidate retained.
  • L2 LMR33630 buck inductor: Bourns SRN6045-2R2Y, 2.2uH shielded candidate.
  • L3 GPS RF bias choke: Murata LQW18AN47NG00D, 47nH RF inductor candidate.
Connectors
  • J4 AS7341 modular optical-head I2C connector: Samtec TSW-104-07-G-S.
  • J7 modular LED-ring connector: Samtec TSW-104-07-G-S.
Pre-Layout Constraints Added
TPS61088 / 5V_SYS boost path
  • Place U7, L1, input caps, output caps, R5/R6, R10, R11/C16, and C14 as a tight boost power cell.
  • Keep VIN-L1-SW and VOUT/5V_SYS loops compact and wide.
  • Keep SW copper short and away from GPS RF, AS7341, SPI, and LED sense/control traces.
  • Stitch exposed pad and power ground with thermal vias to solid ground copper.
  • Do not route sensitive signals under L1 or the SW node.
LMR33630 / 3V3_RAIL buck path
  • Place L2, C10, C11, C12/C13, R7/R8, and C15 tight to U3.
  • Keep buck feedback away from SW node.
  • Keep U3/L2 away from GPS RF and optical-head connector.
GPS RF / U.FL path
  • Place J6 at board edge with cable exit clearance.
  • Route RF_IN as controlled 50Ω with continuous ground reference and via fence.
  • Keep RF feed away from boost/buck inductors, SW nodes, clocks, SPI, and LED current loops.
  • Place L3 close to the GPS RF bias injection node.
LED-ring current path
  • Keep U6, R12/R13, and J7 LED-current paths compact.
  • Size LED traces/returns for Rev A test current.
  • Keep LED return current out of the AS7341 ground reference.
  • Keep PWM/control traces away from boost SW and GPS RF.
Optical-head isolation
  • Keep AS7341 and LED ring connectorized for Rev A.
  • Maintain physical and electrical separation between J4 AS7341 I2C and J7 LED current paths.
  • Reserve mechanical/optical isolation space around the modular optical-head interface.
MP2667 power path
  • Place U1 near USB-C and battery connector.
  • Keep IN/SYS/BATT paths short and wide with thermal copper.
  • Keep charger heat/noise away from AS7341 optical-head connector.
  • Confirm charge-plus-load behavior during bring-up.
Check Results
After cleanup, manufacturing/MPN check readback returned no matching open ERROR/WARNING items for the queried manufacturing/component-review categories. The BOM readback now shows MPN/manufacturer metadata for the previously affected generic capacitor, resistor, inductor, and connector groups.
Remaining Risks Before Layout Release
  1. L1 exact footprint risk: Würth 744311150 is retained electrically, but the generic Flux footprint is set to a closest available large shielded-inductor footprint. Replace/verify against the vendor land pattern before manufacturing.
  2. Grouped generic BOM display: Flux BOM groups generic capacitors/resistors/inductors by part type in the summary view, so individual per-designator MPNs should be rechecked in full BOM/export before ordering.
  3. TPS61088 thermal/current density: Must be verified during layout with copper width, vias, hot-loop area, and Radxa peak-load assumptions.
  4. TPS61088 compensation: R11/C16 are still provisional and should be bench-validated for stability.
  5. LED current setpoints: R12/R13 define provisional LED channel current for Rev A optical testing; final value depends on LED-ring optical measurements.
  6. GPS RF path: Requires controlled-impedance stackup/trace geometry during layout.
  7. AS7341 optical isolation: Mechanical light shielding and LED/sensor geometry remain Rev A experimental items.
Stop Condition
Stopped after BOM/MPN/footprint cleanup, constraint annotation, check readback, and report generation. PCB placement, layout, and routing were not started.

  • Summary

  • Cleanup Applied

  • Capacitors

  • Resistors

  • Inductors

  • Connectors

  • Pre-Layout Constraints Added

  • TPS61088 / 5V_SYS boost path

  • LMR33630 / 3V3_RAIL buck path

  • GPS RF / U.FL path

  • LED-ring current path

  • Optical-head isolation

  • MP2667 power path

  • Check Results

  • Remaining Risks Before Layout Release

  • Stop Condition

AI Spectral Reflectance Analyzer thumbnail
Portable AI-powered spectral reflectance analyzer based on a Radxa Zero 3W carrier PCB, with AS7341 spectral sensing, GPS, SPI touchscreen LCD, microSD logging, USB-C LiPo charging, and integrated optical LED measurement head.

Properties

Pricing & Availability

Distributor

Qty 1

Arrow

$8.57–$18.57

Digi-Key

$7.88

HQonline

$6.94

LCSC

$17.47

Mouser

$21.70

TME

$2.43

Verical

$6.56–$72.98

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