电子戒指FPC设计要求

flux

Work done
  • Started the ring FPC redesign: removed the charging socket/header-class parts and bulky feedback items from the schematic/BOM, including the JST battery socket, SWD header, buzzer, vibration motor, extra switches, and larger LEDs.
  • Added smaller ring-FPC-oriented parts: U4 NRF52832-CIAA-R7 WLCSP BLE MCU, SW4 EVQPUJ02K single microswitch, D4 LNJ347W83RA 0402 LED, direct low-profile battery pads P3/P4, and SWD test pads P5/P6/P7.
  • Reclassified existing P1/P2 as magnetic charging contacts and kept them wired as CHG_5V and GND.
  • Updated passives to 0402 metadata, rewired the new MCU power/reset/SWD/button/LED/charger-status nets, added R9 as the MCP73831 STAT pull-up, and set the board outline request to 72.26 mm × 5.5 mm with 0.15 mm keepout.
Success criteria review
  • ✅ Charging sockets removed from the active BOM/schematic; magnetic charging contacts are present as P1/P2.
  • ✅ Component count and footprint area were substantially reduced; BOM is now focused on compact MCU/charger/LDO/passives/button/LED/contact pads.
  • ⚠️ Button centering was not completed in PCB placement; SW4 is wired but still needs physical placement at the FPC centerline.
  • ⚠️ Dual-sided anti-interference placement was not completed; the PCB needs final top/bottom distribution and rolled-ring clearance verification.
  • ⚠️ ERC/DRC validation was not completed; routing and review remain to be run after placement.
Next steps
Credits ran out before I could finish placement, routing, and validation. The next pass should place all components on the 72.26 mm × 5.5 mm FPC with SW4 centered on the width, distribute small passives on both sides to avoid rolled-ring interference, route the nets, then review ERC/DRC and remaining mechanical constraints.
U3
U4 VDD - U4 VDD
U2 PROG - R1 P1
P1 1 - U2 VDD
U3 EN - C3 P1
U2 VBAT - C2 P1
U2 VBAT - C2 P1
R9 P2 - U2 STAT
GND
GND
U2
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Electronic Ring FPC thumbnail
Flexible 72.26mm × 5.5mm electronic ring FPC designed to roll around a 23mm midline diameter with reserved MCU, LiPo, LED, and magnetic-contact zones.

Properties

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Qty 1

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$3.29–$3.46

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$3.67–$3.91

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$2.06

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$6.24–$6.27

Mouser

$7.42

TME

$0.32

Verical

$0.78–$1.20

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