Embryo Heartbeat Detector PCB Design
Worked for 9 mins 54 sec
I started the comprehensive cleanup and got through Phase 1 and Phase 2, then began Phase 3 routing cleanup before execution credits stopped.
Completed in this session:
-
Phase 1 — Schematic integrity
- Reviewed STM32F303, AFE4404, USB-C, display, SWD, regulator, ESD, crystals, and key passives.
- Marked unused USB-C pins as no-connect: SBU, SuperSpeed TX/RX, and artifact pins.
- Marked AP2112K
NCas no-connect. - Marked unused AFE4404 optional pins as no-connect:
CLK,DNC,TX2,TX3. - Added the missing AFE4404
RX_SUPfilter network:R2210 Ω series filterC2010 µFC21100 nFC2210 nFC231 nF
- Rewired
U2:RX_SUPthrough the new filtered rail. - Reconnected
U2:IO_SUPto 3.3 V with local decoupling after the filter edit exposed it as a single-pin net.
-
Phase 2 — PCB placement review
- Found one new AFE filter capacitor outside the board.
- Replaced only the new AFE RX_SUP filter parts near
U2. R22,C20,C21,C22, andC23are now clustered near AFE4404.- Placement tool reported no overlap or out-of-board problems for the adjusted parts.
-
Phase 3 — Routing cleanup started
- After placement, old traces around USB-C and the new AFE filter became stale and caused many airwire/overlap reports.
- I deleted stale routing on affected nets:
VBUSUSB_DPUSB_DMUSB_CC1USB_CC23V3AGND
- This intentionally removed bad/stale copper so those nets can be cleanly rerouted.
Current state:
- Schematic is improved but should be re-reviewed.
- PCB is not fabrication-ready.
- Several major nets have had stale routing removed and now need rerouting.
- Gerbers should not be exported yet.
Remaining work:
- Re-run DRC/ERC after the stale-route deletion.
- Route
VBUS,3V3,AGND, USB D+/D−, CC1/CC2, and the AFE RX_SUP filter nets. - Delete any remaining dangling traces and floating copper.
- Re-run review until airwires, dangling traces, floating copper, overlaps, and clearance issues are zero.
- Verify analog/digital separation.
- Perform manufacturing readiness check.
- Wait for your approval before Gerber export.
Continue rerouting
Run ERC/DRC
Prioritize cleanup
Check AFE filter
Verify USB-C wiring
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