Battery-Powered LoRa PCB Design

I'm building a compact, battery-powered LoRa sensor node for permanent outdoor deployment, so the board must combine low-power performance with solid RF discipline. The project is a 2-layer PCB that integrates: an Arduino-compatible ultra-low-power MCU (USB-programmable; you may recommend the specific part — e.g. SAMD21 / STM32L class) a pre-certified 900 MHz LoRa module with its RF path tuned to an on-board SMA connector a USB-C power-path circuit able to run, charge and program through the single port a MAX17048 fuel gauge for accurate state-of-charge reporting on-board status LEDs (power, charge status, LoRa TX activity, error) external sensor and button breakouts on JST-PH connectors (settled on JST-PH over XH/SM) Key specifications: External sensor connectors (JST-PH, 3.3V logic): 3× devices on a shared I2C bus, plus 1× device on a UART. Each on its own connector. Provide appropriate I2C pull-ups and a switchable, power-gated sensor rail; I'll confirm exact addresses and current draw. Total external sensor load is low (a few mA). Buttons (external, JST-PH): a reset button to the MCU reset pin, and a power button using a latching circuit for a true OFF (zero battery draw when off). Battery & power: 3.7V LiPo, 10,000 mAh. The board must support a runtime of at least one week from a full charge at a ~10-second transmit interval — firmware sleep logic is my responsibility, so what I'm assessing here is the hardware's contribution: low-quiescent regulators throughout, minimal sleep-state leakage, a deep-sleep-capable MCU, and sensor rails that can be power-gated off during sleep. Please include an estimated hardware power budget (active and sleep current) in the design notes. LoRa: 900 MHz band (902–928 MHz / 915 MHz). Module variant and on-board RF match to suit; SMA antenna to be a 900 MHz type. Environment: permanent outdoor mounting (vibration, wind, dust, rain, sun). Please advise on conformal coating and sealed / IP-rated buttons. The board outline will follow shape constraints I'll share once the mechanical housing is final, so please keep component placement flexible until then. Everything must be ready for turnkey assembly at JLCPCB or PCBWay — use parts from their preferred libraries wherever practical and flag any consigned parts. Deliverables: – Complete, well-annotated schematic – 2-layer layout respecting good RF and low-power practice, with impedance-controlled traces where needed for the LoRa path – Gerbers, drill files, pick-and-place and a 3D STEP model of the final board – Consolidated BOM with LCSC / PCBWay part numbers and viable alternates – Brief design notes covering RF considerations and the expected power budget I strongly prefer designers who have shipped LoRa or other sub-GHz RF boards before — please reference a past design that reached production, and tell me briefly how you'll handle the LoRa-to-SMA RF path. KiCad or Altium sources are both acceptable, as long as they compile without errors.

Project ID: 40483346