Board Refactor Plan

flux

1:34

Following system rules for planning.

Clarifying tool usage for planning.

Planning queries and project guidelines.

Clarifying formatting and tool use.

Accessing knowledge base.

Creating a detailed execution plan.

I’ve built a plan to refactor your board to LoRa‑E5 only with solar LiFePO4 VSYS, SWD, and SMD edge pads, preserving RF to U4 → J2.
  1. Cleanup & RF
  • Remove legacy/THT power/IO; keep U4/J2. Clear orphans. Define VSYS (set net types/voltages).
  1. Solar LiFePO4 → VSYS
  • Add Solar+/Solar− and Batt+/Batt− pads.
  • PFET ideal‑diode reverse protection + OVP on solar input.
  • LiFePO4 charger capped at 50 mA; power‑path to VSYS; charge/protect indicators.
  1. Rails from VSYS
  • Low‑Iq 3.3 V LDO with proper decoupling; verify dropout vs LiFePO4 min voltage (include peaks).
  • 5 V boost 30 mA cont / 40 mA peak, with in/out caps and 5V_OUT pad.
  1. Debug & I/O pads
  • Tag‑Connect TC2030 SWD: SWDIO/PA13, SWCLK/PA14, NRST (pull‑up), optional SWO/PB3, 3V3, GND.
  • Castellated SMD 2.54 mm pads:
    • I2C SDA/SCL with 4.7 kΩ pull‑ups to 3V3; note maximum 400 pF bus capacitance.
    • UART pads on PA2/PA3.
    • Two one‑wire pads on PB13/PB15 with 2‑pad jumpers selecting 3.3 V (default) or 5 V pull‑ups.
    • Adjacent 3V3/5V/GND pads.
  1. Layout & finalize
  • Compact square outline, U4 centered, blue soldermask; keep power away from RF; preserve 50‑ohm feed to J2.
  • Replace generics with real MPNs; run ERC/DRC and fix; update description/BOM.
Let me know if you want any tweaks; otherwise click Start on the plan bar to execute.
Pick charger IC
Select 3.3V LDO
Choose 5V boost
Flux net settings
I2C pull-up sizing
67 days
1
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    The Green Dot 2040E5 Board thumbnail
    The "Green Dot 2040E5" Board is a Node that interfaces RS485 Sensor probes and can log information to the cloud using LoRa Connectivity. It uses the XIAO RP2040 and the LoRa-E5 (STM32WLE5JC) modules from Seeed Studio to do its magic. It also has amazing power management capabilities (Solar charging, Battery protection, etc) that make it very useful for IoT applications #internetOfThings #smartHomeDevices #SeeedStudio #XIAO #LoRa #RP2040 #IoT

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