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1. Check the Datasheet: First, look up the TC2050 datasheet or the Tag-Connect website for the exact footprint and spacing of the holes for the Tag-Connect plug you're using. For the TC2050, it's likely a 2x5 array of holes with specific spacing.
2. Create a Custom Footprint: Since the Tag-Connect connector uses a unique footprint, you may need to create a custom footprint in Flux. Here's a simplified process:
   • Go to the PCB layout editor in Flux.
   • Open the footprint editor to create a new footprint.
   • Using the tool's drawing or pad placement features, add pads or NPTH holes according to the Tag-Connect specifications. For the TC2050, you generally need pads with specific diameters at the correct locations corresponding to the 2x5 layout.
   • Make sure to include two additional larger holes or pads at the ends if your Tag-Connect model requires them for alignment or locking purposes.
3. Spacing and Dimensions: The standard pitch (distance between the centers of adjacent pins) for the TC2050 is typically $0.1$ inches ($2.54$ mm). Ensure the pads/hole positions match these dimensions accurately.
4. Placement on PCB: After creating the footprint, you can place it on your PCB layout where you'd like the Tag-Connect to connect to your board. This is often near your microcontroller or target IC for easy programming or debugging access.
5. Routing: Connect the pads of your Tag-Connect footprint to their respective targets on the PCB. For the TC2050, these might include connections to a microcontroller's SWD, JTAG, or other programming/signaling pins.

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titties

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1. USB Connections
   • Connect $U2:VBUS$ to 5V from the USB connector ($J3:VBUS\_1$).
   • Connect $U2:D+$ to USB D+ ($J3:DP1$).
   • Connect $U2:D-$ to USB D- ($J3:DN1$).
   • Connect $U2:VSS$ to GND ($J3:GND$).
2. Bypass Capacitors
   • Place bypass capacitors (e.g., $C1$ and $C2$) between VDD and GND close to the NRF52820.
3. Programming via USB
   • The NRF52820 can be programmed directly via USB. Once the chip is connected to the USB, it can be configured to enter a bootloader mode. You can utilize Nordic's DFU (Device Firmware Update) bootloader and nRF Connect tools for programming.

• Power from USB:
  • Connect $J3:VBUS\_1$ to $U2:VBUS$.
• Data Lines:
  • Connect $J3:DP1$ to $U2:D+$.
  • Connect $J3:DN1$ to $U2:D-$.

• Make sure you have a proper USB bootloader flashed to the NRF52820. You can use a development board or JTAG for the very first programming to flash the USB bootloader if needed.
• This will allow your chip to be programmable via USB, simplifying your design and enabling easy firmware updates.

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1. Supply voltage (VDD) and Ground connections:
   • Connect J1:Vdd to U2:VDD (pins 8, 9, 18, 30, 40 for redundancy and ensuring there's enough supply for all parts of the chip).
   • Connect J1:GND (pins 3, 5, 7, 9) to U2:VSS and VSS_PA (pins 37, 41) to ensure the ground is connected throughout the device.
2. JTAG Interface connections:
   • Connect J1:TMS (Test Mode State) to U2:P0.15. Although the NRF52820 uses SWD (Serial Wire Debug) instead of JTAG for programming and debugging, you can use TMS as SWDIO in this context.
   • Connect J1:TCK (Test Clock) to U2:P0.14. Similar to TMS, TCK can be used as SWDCLK for SWD in the NRF52820.
   • Connect J1:nReset to U2:P0.18/$$RESET to control the reset line. Although not part of the JTAG/SWD interface, tying the reset line allows for hardware resetting of the microcontroller during programming and debugging.
3. Additional considerations:
   • Since the NRF52820 primarily supports SWD instead of JTAG, you'll use two of the JTAG pins to serve the SWD interface. SWD requires only SWDIO (Serial Wire Debug Input/Output) and SWDCLK (Serial Wire Debug Clock), addressed here with TMS and TCK, respectively.
   • Ensure that the TC2050 cable and connector support the signal integrity and power requirements of the NRF52820 for programming and debugging applications.
   • You might need to adjust the firmware and configuration settings within the IDE (Integrated Development Environment) you are using to ensure it supports programming the NRF52820 through SWD.

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1. Battery to Charger Connection: You have already connected the battery (J2:P2) to the BAT pin (U3:7) of the battery charger (U3). This is appropriate for charging the battery.
2. Supplying Power to the System:
   • The SYS pin (U3:4) of the battery charger IC (U3) is generally used to supply power to the system. When the battery is being charged, the SYS output can power the system directly from the input source. When the input power is removed, the SYS pin gets powered from the battery.
   • Connect the SYS pin (U3:4) to the VIN pin of any device that needs to be powered by the battery, which in your case could include the NRF52820-QDAA-R (U2), the STUSB4500QTR (IC1), and potentially other components in your design that require power but are not mentioned here. Since U1: VIN is already part of a net that includes U3:SYS, it looks like you are in the right direction.
3. Ground Connection: Ensure all components, including the battery ground, are properly connected to a common ground. In your net list, the ground connections seem to be handled by net 33c856d857bd5e853676f5cf75bb6346, connecting several grounds together, including IC1:GND, U3:GND, and U1:VSS. Ensure J2:P1 (assuming it's the battery ground) is also connected here if it's not already.
4. Input Power to Charger IC: Assuming J3 is a USB connector given the presence of VBUS, D+, D-, CC1, and CC2 pins, it's already correctly connected to the IN pin of U3 (battery charger) as part of the net 8e5486811bba51e4b3830c05ce04196a. Ensure that the path between the USB connector's VBUS and the BQ25180YBGR's IN pin is capable of handling the charging current.

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1. NRF52820-QDAA-R for Bluetooth Functionality:
   • This component is central to your project's Bluetooth capability. It seems you have it set up for basic connections including power ($VDD, VDDH$), ground ($VSS, VSS_PA$), decoupling capacitors, and antenna connection for Bluetooth functionality.
2. LED Control:
   • The LED1 is connected to the NRF52820-QDAA-R at pin 31 ($P0.08$) for toggling via Bluetooth commands or touch interaction. This is per your description; however, confirmation on the connection between R5 (current limiting resistor for the LED) and the microcontroller is needed, as the net list shows:
     • Connect $U2:P0.17$ to $R5:P2$ (for LED toggling control). This seems to be a typo because you mentioned pin 31 ($P0.08$) for LED control.
     • Correct Connectivity should be planned like: Connect $U2:P0.08$ to $R5:P1$, and $R5:P2$ to $LED1:K$, allowing for the correct LED toggling functionality.
   • Additionally, there should be a connection from $LED1:A$ (anode) to a source of power. Your description implies LED control through GPIO but doesn't specify how it's powered on the high side.
3. Power Management:
   • The inclusion of IC1 (STUSB4500QTR USB-PD controller), $U3$ (BQ25180YBGR battery charger), and $U1$ (XC6206P332MR-G LDO voltage regulator) indicate a sophisticated power management system for handling USB-C input and charging a LiPo battery.
   • The net list confirms connections for charging control and system power regulation including USB-C to battery charging ($U3$) and system power regulation ($U1$).
   • Connection specifics such as:
     • From USB-C to STUSB4500QTR for VBUS handling.
     • From STUSB4500QTR to BQ25180 for charging pathway control.
     • From BQ25180 to the battery indicates proper planning for USB-C charging.
   • The arrangement should ensure that the LiPo battery can be charged via USB-C and provide power to the system.
4. Manual LED Toggle via Touch:
   • The idea to toggle LED by touching a wire connected to PIN 31 ($P0.08$) on the NRF52820 suggests an interactive GPIO handling. Ensure there's proper firmware debounce handling for this functionality to work smoothly.

• Verify Connections:
  • Review the specific connection between the LED, its resistor (R5), and the NRF52820 to ensure it matches your project description.
• Power Management Verification:
  • Ensure that all components related to power management are correctly connected to handle USB-C input, battery charging, and power regulation without causing any issues. Special attention should be given to the power management ICs' ground connections (see net f4076c2185200954c87a6779ab3f6332), ensuring they are all well-connected to avoid potential ground loops.
• Document Review:
  • Cross-check your project against the manufacturer's datasheets for the NRF52820-QDAA-R, STUSB4500QTR, BQ25180YBGR, and XC6206P332MR-G (among other components) to ensure all connections are compatible and meet the operational requirements provided in the datasheets.
• Firmware:
  • Prepare firmware that handles the Bluetooth functionality appropriately, ensures safe battery charging practices, and includes debounce code for the manual LED toggling feature.

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1. VBUS Line: The VBUS lines from the USB Type-C connector (J3) should be connected to the VBUS line of the STUSB4500QTR (IC1). However, since the VBUS lines on J3 are split into multiple pins (VBUS, VBUS$1, VBUS$2, VBUS$$3), you should ensure they are appropriately merged before connecting to IC1.
   • Connect J3:VBUS to IC1:VBUS_VS_DISCH.
   • Note: You may need additional circuitry to safely handle VBUS power paths, such as current limiting or overvoltage protection.
2. CC Lines: USB Type-C connectors have two CC lines for cable orientation detection and communication. Both CC lines from the USB connector need to connect to the CC lines of the STUSB4500QTR for proper USB PD negotiation.
   • Connect J3:CC1 to IC1:CC1.
   • Connect J3:CC2 to IC1:CC2.
3. Ground Connections: Ensure that the GND pins on the USB connector are connected to the GND pins on the IC1 to complete the power circuit.
   • Connect J3:GND, J3:GND$1, J3:GND$2, and J3:GND$$3 to IC1:GND.

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1. VBUS Supply from USB to Charger:
   • The 'VBUS' from a USB connector (presumably through IC1 VBUS or similar pin) should be connected to the 'IN' pin of U3 to provide the input source for battery charging. This assumes you're using IC1 to negotiate power over USB-C and provide a controlled VBUS for charging.
   • Already in your design, IC1 VBUS is taken from Net 1d87530105d95943751cb5c191f2b077. You would route this VBUS directly to U3 IN (pin 2).
2. Enable Signal:
   • If needed, you can use the 'VBUS_EN_SNK' pin from IC1, which is controlled by the USB PD negotiation outcome, to enable U3. However, U3 does not have a direct 'enable' pin, implying it's always enabled as long as there is power. Thus, this step may not be required.
3. I2C Communication (Optional):
   • Both IC1 and U3 support I2C communication. If you need to configure or monitor the charger IC via the USB PD controller, you would connect the I2C lines (SCL and SDA) between them. However, based on your current design, it does not seem like direct I2C communication between IC1 and U3 is contemplated. If this changes, you would connect IC1: SCL (pin 7) to U3: SCL (pin 3), and IC1: SDA (pin 8) to U3: SDA (pin 8). Note that proper pull-up resistors should be added to each I2C line (typically $4.7k$ to $10k$ ohms to the I2C bus voltage level).
4. Ground Connection:
   • Connect IC1 (GND, pin 25) to U3 (GND, pin 5) to ensure that they have a common ground reference.

• Connect IC1:VBUS_VS_DISCH (pin 18) to U3:IN (pin 2). (This assumes 'VBUS_VS_DISCH' refers to a VBUS related pin capable of providing power to the charger; if not, use the appropriate VBUS output from IC1.)

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• Ensure that both IC1 and U2 are supplied with the correct voltages. The STUSB4500QTR typically operates at 5V provided over USB, and the NRF52820-QDAA-R has flexible voltage requirements but commonly uses 3.3V for its operations. You might need a voltage regulator in between if your setup requires the NRF52820 to operate at a lower voltage than what USB provides.

• Connect IC1 (STUSB4500QTR): SCL (Pin 7) to U2 (NRF52820-QDAA-R): P0.20 (or another GPIO configured as I²C SCL in your firmware).
• Connect IC1 (STUSB4500QTR): SDA (Pin 8) to U2 (NRF52820-QDAA-R): P0.17 (or another GPIO configured as I²C SDA in your firmware).

• Connect IC1 (STUSB4500QTR): VDD (Pin 24) to a 3.3V power source suitable for digital ICs. If U2's VDD sources are used, ensure they can supply enough current.
• Connect all ground pins (GND) of both IC1 and U2 together to ensure they have a common ground reference.