PCB Design Execution Plan

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Design Notes
Requirements Snapshot
  • Board target: 35 mm x 25 mm wearable pod
  • Stackup target: 4-layer
    • Top: components and signals
    • L2: solid GND plane
    • L3: 3.3 V plane
    • Bottom: signals and antenna traces
  • Power target: 500 mAh LiPo, average load about 30 mA, estimated runtime about 16.7 h ideal before derating
  • Manufacturing target: JLCPCB assembly with LCSC-sourceable parts where practical
Initial Architecture Decisions
  • Use ESP32-C6-MINI-1-N4 as the main wireless MCU.
  • Use MAX-M10S-00B as the GNSS receiver with external active/passive antenna via u.FL.
  • Use BMI323 on I2C for the IMU.
  • Use a simple USB-C 5 V sink with CC pull-down resistors, VBUS TVS, and LiPo charge management.
  • Use a low-IQ 3.3 V LDO plus a dedicated load switch to isolate peripherals for deep sleep.
  • Use SPI microSD for log storage and optional I2C fuel gauge.
BOM Direction
Open Technical Tradeoff
  • Very-low-IQ and guaranteed 300 mA+ LDO availability in-library is weak. Likely path:
    • choose a compact low-IQ LDO for always-on rail, and
    • add a load switch so GNSS, microSD, and sensors can be power-gated.
Finalization Notes
  • R1 and R2 updated to 1 kOhm.
  • USB-C CC pull-down connectivity remains on the dedicated USB_CC1 and USB_CC2 nets.
  • microSD VDD is fed from 3V3_SW through U5, which is the intended switched rail for low sleep current.
  • Target layout remains 35 mm x 25 mm, 4-layer, with GNSS RF area requiring a 5 mm keepout discipline around U2 and the antenna path.

    Requirements Snapshot

    Initial Architecture Decisions

    BOM Direction

    Open Technical Tradeoff

    Finalization Notes

Documents

    Design Notes

    Project Specification

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Wearable GPS IMU Tracker

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