# LoRa Solar charge Controlle (Component) ## Description Solar Node Rev E: Tightened TPS63000 power loop with isolated control-GND; relocated CN3795 MPPT/FB return and added dedicated Kelvin-sense nets; added USB-C ESD protection array and CC Rd resistor network. #SolarNodeRevE #TPS63000Loop #CN3795MPPT #KelvinSense #USBCProtection ## Component Details - **Owner:** v1gmail - **Created:** 12/20/2025 - **Last Updated:** 1/12/2026 - **Visibility:** Public - **Reference Design URL:** https://www.ti.com/lit/ds/symlink/tps63000.pdf - **Connectivity:** USB - **Default via drill size:** 0.3mm - **License:** http://solderpad.org/licenses/SHL-2.1/ - **Power net minimum trace width:** 20mil - **Stackup:** Standard 2 Layer - **Placement Guidelines:** Place J1 (USB-C receptacle) on the PCB edge to align the connector opening with the board outline; keep the connector body fully on-board while allowing shell tabs and mounting holes to sit inside the mechanical keepout from the board edge. Cluster U3 (TPD2EUSB30 ESD array) directly behind or beside J1 so its D+ and D- pins route as very short, direct traces between J1:DP1/DN1 and the rest of the USB data paths. Group U1 (TPS63000) and U2 (CN3795) close together in the power section so that the primary power loops and Kelvin-sense connections stay compact and local. Reserve keepout corridors for high-current paths from J1 VBUS through U1/U2 and to the battery nodes, avoiding signal vias and sensitive traces in these regions. Do not pre-route these connections in the guidelines; instead, leave schematic-to-PCB rats visible so detailed routing can follow these placement constraints and maintain tight power and sense loops. - **Project Notes:** Solar Node Rev E: Tightened TPS63000 power loop with isolated control GND; relocated CN3795 MPPT/FB return with Kelvin sense; added USB-C ESD array and CC Rd network. - **Power Requirements:** Battery - **Domain:** Energy - **System Architecture:** flowchart TD SP[Solar Panel Input] CN[CN3795 MPPT Controller] TPS[TPS63000 Buck-Boost Converter] BAT[Battery] USB[USB-C ESD Protection] CC[CC Rd Network] MCU[Microcontroller] SENS[Sensors] LOAD[Loads] SP --> CN SP --> TPS SP --> BAT SP --> USB SP --> CC SP --> MCU SP --> SENS SP --> LOAD CN --> TPS CN --> BAT CN --> USB CN --> CC CN --> MCU CN --> SENS CN --> LOAD TPS --> BAT TPS --> USB TPS --> CC TPS --> MCU TPS --> SENS TPS --> LOAD BAT --> USB BAT --> CC BAT --> MCU BAT --> SENS BAT --> LOAD USB --> CC USB --> MCU USB --> SENS USB --> LOAD CC --> MCU CC --> SENS CC --> LOAD MCU --> SENS MCU --> LOAD SENS --> LOAD - **Default pad size:** 0.6mm - **Change List Summary:** - Tightened TPS63000 power loop by isolating control-GND and explicitly connecting VIN, VOUT, and PGND - Relocated CN3795 MPPT_RETURN net, added FB_SENSE net portal, and created Kelvin Sense Guidelines project property - Added USB-C ESD protection array (TPD2EUSB30) with D+ and D– net portals connected to J1 DP/DN pins - Added 5.1 kΩ CC1/CC2 pull-down resistors on CC1 and CC2 nets - Updated R1 and R2 footprints to SMD 0603 and configured resistor properties - Added Placement Guidelines project property for J1, U1, and U2 placement and keepouts - Added decoupling capacitors (C1–C4) on all power IC pins - Added pull-up resistor (R3) for U2 nCHRG control pin - **Default signal trace width:** 6mil - **Kelvin Sense Guidelines:** Route MPPT_RETURN and FB_SENSE as true Kelvin-sense returns to U2. For MPPT_RETURN, bring the sense trace from the MPPT network back to U2:MPPT/COM as a matched, tightly coupled pair with minimal shared current path to power grounds; avoid sharing copper with high-current charging paths and connect at the local reference node near U2:COM. For FB_SENSE, route a dedicated, thin sense trace from the feedback divider output back to U2:FB, keeping it away from switching nodes (inductor, DRV, high dV/dt nets) and only referencing ground at the local U2:COM/GND node. Do not pour copper or run wide planes on these sense nets; keep them short, direct, and free from large load or charge currents so the CN3795 sees the true battery/MPPT voltages at its pins. - **Stars:** 1 - **Pin Count:** 44 ## Pins | Pin | Name | Type | |-----|------|------| | - | 1 | | | - | 10 | | | - | 11 | | | - | 12 | | | - | 13 | | | - | 14 GND | | | - | 15 RF_BT | | | - | 16 GND | | | - | 17 NRF_RESET | | | - | 18 SWDCLK | | | - | 19 SWDIO | | | - | 2 | | | - | 20 VBAT_SX | | | - | 21 VBAT_IO_SX | | | - | 22 GND | | | - | 23 | | | - | 24 | | | - | 25 | | | - | 26 | | | - | 27 | | | - | 29 | | | - | 3 | | | - | 30 | | | - | 31 | | | - | 32 | | | - | 33 | | | - | 34 | | | - | 35 | | | - | 36 GND | | | - | 37 | | | - | 38 GND | | | - | 39 | | | - | 4 | | | - | 40 | | | - | 41 | | | - | 42 GND | | | - | 43 | | | - | 44 | | | - | 5 | | | - | 6 | | | - | 7 | | | - | 8 | | | - | 9 | | | - | LED2 | | --- *Generated from [https://www.flux.ai/v1gmail/lora-solar-charge-controlle~5e](https://www.flux.ai/v1gmail/lora-solar-charge-controlle~5e)*