STM32WLE5JC Design Modification

flux

You want the STM32WLE5JC (LoRa‑E5) to be the only MCU, with SWD via Tag‑Connect, I2C/UART/one‑wire breakouts, solar+LiFePO4 power, and a 5 V output on a rectangular blue PCB.
Plan summary:
  1. Remove unused parts: U6, J1, J3, J6, 12.5 V boost rail (IC1, L1, D4, related passives), RS‑485 (IC2, related), and mounting holes H1/H2.
  2. Make U4 sole MCU; add Tag‑Connect TC2030 SWD pads (SWDIO, SWCLK, NRST, 3V3, GND; SWO optional); keep RF and J2.
  3. Power: add Solar+/Solar− pads; replace U2 with a LiFePO4 charger for 5 V input and 14430 cell; add Batt+/Batt− pads; ensure 3.3 V rail for STM32; add a 5 V boost converter and 5V_OUT pads.
  4. IO breakouts: add solder pads for I2C (SCL/SDA with pull‑ups), UART (TX/RX), and two GPIO for one‑wire (optional pull‑ups), plus nearby 3V3 and GND pads.
  5. PCB/layout: remove headers/holes; place new pads; connect nets; set rectangular outline and blue mask note; run ERC/DRC and availability checks.
This plan is ready to execute. Click Start to begin.
Before I proceed, two quick details to finalize:
  • 5 V rail: what maximum continuous and peak current should we design for?
  • One‑wire sensors: power at 3.3 V or 5 V? Do you want onboard 4.7 kΩ pull‑ups to that rail, or leave footprints unpopulated?
  • Breakout style: edge castellated pads or interior rectangular solder pads (no headers)? Any preferred pad pitch/size?
maj-6

maj-6

Peak current on 5V rail will be 40mA. Continuous 30mA. One-wire sensors will need both 3.3v and 5v. Pads should be 2.54mm castellated.

flux

Your goal: single‑MCU STM32WLE5JC board with SWD, castellated IO, 5 V boost (30 mA cont/40 mA pk), and 5 V/60 mA solar + 14430 LiFePO4 power, on a rectangular blue PCB.
Plan:
  1. Remove legacy circuits and holes; keep LoRa‑E5 RF path.
  2. Redesign power: LiFePO4 charger (5 V solar), 3.3 V rail, 5 V boost, add Solar/Batt/5V pads.
  3. Add 6‑pad SWD, verify reset/decoupling.
  4. Add 2.54 mm castellated I2C (4.7 k pull‑ups, ≤ 400 pF), UART, two one‑wire with 3V3/5V/GND.
  5. Rectangular outline, blue mask; route and review.
Click Start to execute, or let me know if you want tweaks.
Pick 5V boost IC
Select LiFePO4 charger
Castellated pad guidance
One-wire pullup choice
Define breakout pin map
What is this switch for?
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what is the component supplier
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please explain what U4 does.
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design a simple robotic structure
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please explain what IC1 does.
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list all U3 pins in a table format. For each pin provide its pin number, pin nam...
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A XIAO RP2040 tudja kezelni a 2 uart kapcsolatot?
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recommend a replacement for U4.
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what will be the ripple current in this capacitor?
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please explain what +3V3 does.
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how do I use Flux?
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D4 purpose?
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please explain what C6 does.
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explain this project.
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explain this project.
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using the configuration of this project, what is the charging current?
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please explain what R10 does.
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are there any issues in this project?
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recommend a replacement for U3.
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list all ICs and the decoupling capacitors attached to each. Ensure to include a...
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arduino
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explain this project.
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can you provide the BOM with description, maximum voltage that the component get...
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please explain what R9, R6, R1, IC1, L1, D4, R4, VBAT, C10, SW1, 12\_5V, C7 do.
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how do I use Flux?
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create a high level mermaid block diagram of this project. Include key component...
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please add LED with degree of view 30 degree with magenta color with 0402 footpr...
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what is this design?
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are there any issues in this project?
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how to add lora communication?
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please explain what U2 does.
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Explain what each of the components here are, and what and where the connection...
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please explain what D3 does.
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explain this project.
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scanner radio ?
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why do you place here a resistor?
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Hello, This is wrong. It is not like that from its datasheet
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explain this project.
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what kind of soldered patch antenna for lora would you advise instead of the ipe...
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create a high level mermaid block diagram of U6. Include key component's manufac...
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explain this project.
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explain this project.
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recommend a replacement for R5.
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please explain what U4 does.
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Tengo una bateria y su cargador, como puedo hacer un circuito para que la baterí...
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list all ICs and the decoupling capacitors attached to each. Ensure to include a...
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create a detailed step by step plan table for this project to verify its functio...
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explain this project.
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recommend a replacement for L2.
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explain this project.
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120ohm是如何計算出來的呢？
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list all U2 pins in a table format. For each pin provide its pin number, pin nam...
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please explain what D5 does.
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recommend a replacement for U6.
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recommend a replacement for U1.
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add a adc circuit 5v
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hi
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+3V3
VBAT
+3V3
+3V3
C11
Capacitance
4u7 F
U6
VUSB
ENABLE
PIO2
SDA
+3V3
C2
Capacitance
10uF
C8
Not Recommended for New Designs
Capacitance
68pF
RX
NRST
RO
RX
NRST
TX
C10
Capacitance
22uF
DI
ENABLE
SCL
TX
PIO1
DI
C6
Capacitance
100nF
C5
Capacitance
10uF
RO
R9
Resistance
20kΩ
R11
Resistance
22 Ω
R8
Resistance
2kΩ
R7
Resistance
15kΩ
R6
Resistance
150kΩ
R1
Resistance
3kΩ
R10
Resistance
22 Ω
R4
Resistance
4k7 Ω
R13
Resistance
470 Ω
R3
Resistance
68kΩ
R5
Resistance
6k8 Ω
L2
Inductance
2u2 H
R18
Resistance
22 Ω
SW2
U4
D4
D5
Color
Red
SW1
D2
Color
Green
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please explain what U4 does.
nickyhero965

nickyhero965

@copilot please explain what U4 does.
1y

copilot

The component U4U4 is using the part number 317990687, which refers to the Seeed Studio LoRa-E5 module. This module is based on the STM32WLE5JC, which is a chip that combines a microcontroller and a LoRa modem. Here's a brief overview of its main functions and purposes:
  • Microcontroller: The STM32WLE5JC part of the module includes a 32-bit ARM Cortex-M4 processor. This allows it to perform various processing tasks, handle data, and interface with other peripherals.
  • LoRa Connectivity: LoRa (Long Range) is a wireless communication technology designed for long-range, low-power communications. It's commonly used in IoT applications for sending small amounts of data over large distances.
  • I/O Capabilities: The module has multiple I/O pins, allowing it to interface with other components, sensors, or devices to collect data or send control signals.
  • Integrated RF Circuitry: The module includes RF components necessary for wireless communication, which simplifies the design process by reducing the need to design these circuits from scratch.
The U4U4 module in your design is primarily responsible for enabling communication with the cloud using LoRa, which is part of what makes your project suitable for IoT applications. Do you need further details on how to interface this module with other components in your design?
1y
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U3
J2
U2
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The Green Dot 2040E5 Board

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

Properties

Properties describe core aspects of the project.

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