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• VCC: Connect to the power source (e.g., USB VBUS).
• GND: Connect to the common ground.
• BAT: Connect to the positive terminal of the Li-Po battery.
• PROG: Use a resistor to ground to set the charge current.
• CE: Used for chip enable, connected to VCC if always enabled.
• TEMP: Used for thermistor, normally connected to a suitable resistor divider or left floating if not used.
• ~CHRG and ~STDBY: Status indicator pins, connect to LEDs as needed.

• DW01A:
  • VDD: Connect to the positive terminal of the battery.
  • GND: Connect to the common ground.
  • CO: Connects to G2 of the FS8205A to control charging protection.
  • DO: Connects to G1 of the FS8205A to control discharge protection.
  • VM: Connect to the battery's positive terminal for voltage monitoring.
• FS8205A (Dual N-Channel MOSFET):
  • S1/S2: Connect together and to ground.
  • G1: Connect to DO of the DW01A.
  • G2: Connect to CO of the DW01A.
  • D1/D2: Connect to the battery positive terminal for current flow control.

1. Connect U3:D1/D2 to the positive terminal of your battery.
2. Connect U3:S1 to the ground, together with S2.
3. U2:DO should be connected to U3:G1 for discharge protection.
4. U2:CO should be connected to U3:G2 for charge protection.
5. U1:BAT should be connected to the positive terminal of the battery (the same connection point where you have U3:D1/D2).

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• VCC (U1:VCC): Connected to the USB VBUS, which corresponds to the J2:V-BUS to supply power.
• GND (U1:GND): Connected to the common ground net, shared with other components.
• BAT (U1:BAT): Should be connected to U3:D1/D2 and the positive terminal of the battery.
• PROG (U1:PROG): Connect to R3:P1 to set the charge current through a resistor.
• ~STDBY (U1:~STDBY): Connect to R1:P2 for LED indication.
• ~CHRG (U1:~CHRG): Connect to R2:P2 for LED indication.
• CE (U1:CE): Enable pin is tied to [Net 11](Net 11), typically connected to VCC to keep the charger enabled.
• TEMP (U1:TEMP): Usually grounded or used with a thermistor; connected to the ground in your project.
• EP (U1:EP): Exposed pad should be connected to the ground for thermal dissipation.

• DW01A:
  • VDD (U2:VDD): Connected to $\text{Net 10}$, which connects to the battery positive terminal for power.
  • GND (U2:GND): Connected to the common ground net.
  • CO (U2:CO): Should be connected to U3:G2 to control the charging MOSFET.
  • DO (U2:DO): Should be connected to U3:G1 to control the discharging MOSFET.
  • VM (U2:VM): Used for voltage monitoring, typically connected to the battery positive.
• FS8205A:
  • S1/S2 (U3:S1, U3:S2): Connected together to allow current flow in both MOSFETs and connected to your circuit's appropriate points.
  • G1/G2: Controlled by the DW01A outputs for charge and discharge protection.
  • D1/D2: Connected to the battery terminal for controlling load and charge current.

• Net 4: Connects U1:BAT, U3:D1/D2, C2, R4, and R5, forming part of the battery positive network.
• Net 10: Connects U2:VDD, R4, and C3 to manage DW01A's power input.

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• S1 and S2 of the FS8205A (dual N-Channel MOSFET) should indeed be connected together. Here's how these connections generally work:

1. S1/S2 Connection to Ground:
   • S1 (U3:S1) and S2 (U3:S2) should be connected to the common ground. This ensures the MOSFETs can control the flow of current between the battery and the circuit.
2. Connection to Battery Negative:
   • In some configurations, the common connection of S1/S2 might be connected to the battery negative terminal, especially if the protection circuit is inline between the battery and the load/charger.

• U3:S1 and U3:S2 are part of the GND net, ensuring that they are connected to the common ground.
• The battery negative terminal (B-) should also be part of this ground net to ensure that current can return to the battery appropriately.

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• S1 (U3:S1) and S2 (U3:S2):
  • These should be connected to the common ground. In a typical battery protection circuit using FS8205A, S1 and S2 act as the source terminals for the N-channel MOSFETs, and they should be tied to the ground.
  • For the battery negative connection, you should ensure that the common ground net includes the battery negative terminal. This ensures that current can safely return to the battery.

• D1/D2 (U3:D1/D2):
  • These serve as the drain terminals of the MOSFETs.
  • Connect D1/D2 to the positive terminal of the battery. This allows the MOSFETs to control the flow of current to and from the battery. The connection manages both charging and discharging paths, ensuring the protection mechanisms function properly.

• D1/D2: Connect to the positive terminal of the battery.
• S1/S2: Connect to the common ground, ensuring it's part of the same net as the battery negative.

• U3:S1 and U3:S2 are indeed connected to the GND net, which should be shared with the battery negative to form a common ground.
• U3:D1/D2 is already connected to Net 4, which should include the positive terminal of the battery.

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• D1/D2 (U3:D1/D2):
  • These are the drain terminals of the MOSFETs.
  • They need to be connected to the positive terminal of the battery. This allows the MOSFETs to control the charge and discharge paths of the battery.

• $U3:D1/D2$ is connected in Net 4 alongside:
  • $U1:BAT$
  • $C2:P1$
  • $R4:P1$
  • $R5:P2$

• Ensure D1/D2 is not mistakenly connected to ground or a non-battery voltage net.
• Make sure that all ground connections are common and connect back to the battery negative.

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1. TP4056 (U1) Connections:
   • VCC (U1:VCC): Connected to the USB power source, which appears to be $J2:V-BUS$ and J2:V-BUS__1.
   • BAT (U1:BAT): Should connect to the positive terminal of the battery and is currently part of Net 4 with $U3:D1/D2$, ensuring path control for charging/discharging.
   • GND (U1:GND): Correctly connected to ground.
   • PROG (U1:PROG): Needs a resistor to set charge current; connected to $R3:P1$ in Net 12.
   • Other pins
     • ~CHRG and ~STDBY: Check their connections to ensure LED functionality (appear properly connected in nets).
     • CE: Make sure it's tied high or otherwise correctly configured to enable charging.
2. DW01A (U2) Connections:
   • VDD (U2:VDD): Needs connection to battery positive; connected via Net 10.
   • GND (U2:GND): Correctly connected to ground.
   • DO (U2:DO): Must connect to $U3:G1$ for discharging control; mapped to Net 5.
   • CO (U2:CO): Must connect to $U3:G2$ for charging control; mapped to Net 1.
   • VM (U2:VM): Should monitor battery voltage and is connected to ground in ef02e8bd5a335cfb17a646431fbdb.
3. FS8205A (U3) Connections:
   • S1/S2 (U3:S1 and U3:S2): These should connect to the common ground, which they do.
   • D1/D2 (U3:D1/D2): Should connect to the battery positive, ensuring integral charge/discharge pathways. Currently part of Net 4, which is correct.

• Observe the Battery Monitoring (VM): Ensure proper connection to the positive terminal for effective operation. Currently, it's part of a ground net, which may require repositioning.
• Ensure Net Integrity: Verify that all critical nets do not have unintended crossovers or disconnections using the view or inspection system available in your CAD tool.

• Most critical connections seem correct, but attention should be paid especially to VM on DW01A.
• Ensure $U2:VM$ is correctly measuring the battery voltage (consider rerouting if it should connect to battery positive instead of merged GND).

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• VM (U2:VM): It is currently connected to R5:P1 in the GND net.

• VM is used for voltage monitoring and should typically be connected to the positive terminal of the battery, not directly to ground. This ensures it can properly sense the battery voltage to control over-discharge protection.

• Disconnect U2:VM from the ground net.
• Connect U2:VM to the same net as the positive terminal of your battery, which in your setup might be Net 4 (since it includes U1:BAT and U3:D1/D2).

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• In your current configuration, U2:VM is connected to R5:P2. It is part of Net 15, which currently might not be properly configured for voltage sensing.

• VM should be connected to the battery positive terminal to monitor the battery's voltage. This way, it can effectively control the over-discharge protection feature by the DW01A. Ensure that VM is connected to Net 4, as it contains the positive connections related to the battery.

• R4 is not typically required before VCC on U2 (DW01A) in a standard Li-Po protection circuit setup.
  • The DW01A typically connects directly to the positive terminal via VDD without a need for an inline resistor at VCC.
  • Ensure that U2:VDD is connected directly to the battery positive or your circuit's VCC that corresponds to uninterrupted voltage levels.

• Reconfigure VM (U2:VM) to connect with the battery positive effectively, not the ground.
• Ensure there’s no inadvertent resistor between VDD and the power source unless specifically outlined for limiting current or part of a customized feature.

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• Connection Requirement: Directly connect to the battery positive terminal. This pin powers the DW01A, and a direct connection is standard for providing accurate battery voltage to the IC.
• No Resistor Required: Use a direct connection to ensure full voltage for proper monitoring and control.

• Connection Requirement: Connects directly to the battery positive terminal for voltage monitoring.
• No Resistor Needed: The VM pin needs to accurately track the battery voltage to handle proper charge and discharge protection.

• Direct Connections: Ensure VDD and VM are directly wired to the battery's positive terminal.
• Remove Resistors: Avoid placing resistors on these lines unless your circuit's specific requirements call for current limiting or voltage division for custom features.

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1. VDD (U2:VDD)
   • Should be connected directly to the battery's positive terminal to power the DW01A. This ensures accurate sensing and operation.
2. VM (U2:VM)
   • Also should connect directly to the battery's positive terminal to monitor the battery voltage accurately. This is crucial for detecting over-discharge conditions.
3. CO (U2:CO)
   • Connected to $U3:G2$, allowing it to control the charging path via the MOSFET.
4. DO (U2:DO)
   • Connected to $U3:G1$, allowing it to manage the discharging path via the MOSFET.

• Resistor Usage: Normally, you don’t need resistors in series before VDD or VM for standard operation. Ensure the pins are directly connected to the appropriate net reflecting the battery's voltage accurately without resistive drops.
• Check All Nets: Confirm there are no stray connections or unintended short circuits that might obscure the circuit's logic or save path routing.

• Ensure that U2:VDD and U2:VM are on a net that directly interfaces with the battery positive.
• Confirm that U3's S1/S2 are indeed linked to ground, and that D1/D2 engage with the battery positive terminal.
• Double-check, using a schematic view in Flux, that each net has consistent names and electrically wise links to ensure connectivity is stable across the layout.

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1. TP4056 (U1) Connections:
   • VCC (U1:VCC): Properly connected to the power source from J2:V-BUS.
   • BAT (U1:BAT): Connected to the positive terminal of the battery through Net 4; this is correct.
   • GND (U1:GND): Appropriately connected to the common ground.
   • PROG (U1:PROG): Connected through Net 12, typically for setting charge current with a resistor.
   • CE (U1:CE): Should be connected high to enable charging, confirm it's connected to Net 11 with VBUS.
   • TEMP (U1:TEMP): Correctly grounded or tied in systems requiring temperature feedback.
   • ~CHRG and ~STDBY: Properly linked to nets with LEDs for status indication.
2. DW01A (U2) Connections:
   • VDD (U2:VDD): Confirm it's connected to the battery positive, either through Net 4 or another valid net.
   • GND (U2:GND): Appropriately connected to the common ground.
   • CO (U2:CO): Correctly wired to U3:G2 for controlling charge path MOSFET; connected through Net 1.
   • DO (U2:DO): Correctly wired to U3:G1 for discharging path control; connected through Net 5.
   • VM (U2:VM): Ensure it's connected to the same net as the battery positive for proper voltage monitoring.
3. FS8205A (U3) Connections:
   • S1/S2 (U3:S1 and U3:S2): Should be tied to the common ground, which they are.
   • D1/D2 (U3:D1/D2): Connected to the battery positive, allowing for current regulation for charging/discharging; confirmed via Net 4.

• Verify R4 or other voltage-affecting elements aren’t unused; these could complicate the charging circuit's integrity if misplaced.
• Ensure all nets are electrically continuous without stray or broken connections.

• Double-check through schematic inspection that each ground and power line is logically connected in the Flux tool.
• Make sure the naming consistency of nets guarantees no logical errors are present.

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1. TP4056 (U1) Connections:
   • VCC (U1:VCC): Make sure it is connected to J2 (USB VBUS), which seems to be correct with Net 11.
   • BAT (U1:BAT): Should be connected to the battery positive terminal via Net 1, which includes other battery charge paths.
   • GND (U1:GND): Should be connected to the common GND net.
   • PROG (U1:PROG): Properly connect with a resistor to ground for setting the charge current via Net 12.
   • CE, ~CHRG, ~STDBY, TEMP (U1:CE,~CHRG,~STDBY,TEMP): Double-check their respective nets ensure correct logic (e.g., Net 11 for CE).
2. DW01A (U2) Connections:
   • VDD (U2:VDD): Should be directly connected to a stable battery positive through Net 10 or equivalent.
   • GND (U2:GND): Tied to common ground.
   • CO, DO (U2:CO,DO): Controller outputs connected to U3:G1 and U3:G2 through Net 5 and Net 10 respectively for the FS8205A.
   • VM (U2:VM): Ensure it is connected to the battery positive; misconnected to ground might need rearrangement.
3. FS8205A (U3) Connections:
   • S1/S2 (U3:S1, S2): Confirmed as connected to the common ground.
   • D1/D2 (U3:D1/D2): Should connect to battery positive, making sure this ties into paths for both charging/discharging.

• Ground (GND): Verify shared across all major components—U1, U2, U3.
• Battery Positive Connections (Net 4, Net 10): Ensure clarity in which nets hold charge control, particularly if needing splits.
• Control Outs (CO/DO): Properly routed to G1/G2 on N-Channels of FS8205A to control charging/discharging.

• Ensure No Floating Pins: Double-check status pins like SHDN, PG signals have LED or pull-ups where needed, especially on monitoring ICs.
• R4 Values: Confirm what functionality it’s providing in the circuit if applied to limits.

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1. TP4056 (U1) Charging IC:
   • VCC (U1:VCC): Connected to the USB VBUS through J2:V-BUS. This connection is crucial for receiving input power for charging.
   • GND (U1:GND): Consistently connected with the common ground net GND.
   • BAT (U1:BAT): Tied to the positive terminal of the battery for charging, ensured via Net 4.
   • PROG (U1:PROG): Sets the charging current typically, linked through Net 12 with a suitable resistor.
   • CE, ~CHRG, ~STDBY, TEMP: Ensure correct states—CE should be high for enable; status pins indicating charge/standby state via LED feedbacks.
2. DW01A (U2) Protection IC:
   • VDD (U2:VDD): Connected to the battery positive terminal; this is essential for sensing battery voltage.
   • GND (U2:GND): Correctly tied to ground.
   • CO (U2:CO): Should connect to G2 of the FS8205A to control charging; currently looks fine in Net 13.
   • DO (U2:DO): Tied to G1 of the FS8205A for discharging control; mapped correctly.
   • VM (U2:VM): Verify its connection to battery positive for voltage measuring.
3. FS8205A (U3) MOSFET Array:
   • D1/D2: Connected to the battery positive, forming integral paths for safe discharging.
   • S1/S2: Grounded, providing a consistent reference for both MOSFET channels.

• Battery Pathways: Ensure Net 4 carries battery positive to essential charge/discharge points without resistance unless needed.
• GND Net: Standardize all ground connections; inconsistent ground nets can hamper IC performance.
• VM Connection: Reset this pin if linked inadequately, needing voltage source reliability readings.
• Status Indicators: Confirm LED diodes/indicators function as feedback for end-user status when charging/discharging.

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1. D+ (USB Data Plus)
   • Pin Designation: Typically corresponds to DP1 and DP2.
   • In your setup, it should be J2:DP1 and J2:DP2.
2. D- (USB Data Minus)
   • Pin Designation: Typically corresponds to DN1 and DN2.
   • In your setup, it should be J2:DN1 and J2:DN2.

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1. Power and Ground:
   • VBUS (J2:VBUS): Connect to your input power rail. In most USB-C connectors, there are multiple VBUS pins (such as pins 15 and 16), so ensure they are all connected if applicable.
   • GND (J2:GND): Connect all the ground pins to your common ground net. Typically, these are pins 7 through 12 on a USB-C connector.
2. Data Lines:
   • D+ (J2:DP1, DP2): Connect to the $D+$ line of your USB interface circuit.
   • D- (J2:DN1, DN2): Connect to the $D-$ line of your USB interface circuit.

3. CC Pins (Configuration Channel):
   • Not strictly necessary for basic power and data applications, but for proper USB-C detection and for enabling specific power modes, you may need to connect the CC1 and CC2 pins. Typically, they can be grounded through resistors to indicate your device’s power requirements to the source.
4. Optional/Unused:
   • If you don't utilize features like USB-C alternate modes, DisplayPort, or other advanced functionality, you can leave the SBU1, SBU2, and similar pins unconnected.

copilot

• Digi-Key: $0.04367–$0.24
• Arrow: $0.0282–$0.1889
• LCSC: $0.0164
• Verical: $0.0219–$0.0415
• Mouser: $0.20

copilot

• Digi-Key: $0.04367–$0.24
• Arrow: $0.0282–$0.1889
• LCSC: $0.0164
• Verical: $0.0219–$0.0415
• Mouser: $0.20

• Digi-Key: $0.03822–$0.26
• Arrow: $0.0294–$0.0337
• LCSC: $0.0165
• Verical: $0.0218–$0.0444
• Mouser: $0.22

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• Wavelength: 640 nm [1], which is on the higher side of the red spectrum.
• Price Range:
  • Digi-Key: $0.19847–$0.67

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1. Typical UV LED Applications: UV LEDs are commonly used in applications such as curing, phototherapy, fluorescence, and sterilization.
2. Factors Affecting Cost: The price of UV LEDs can be influenced by the wavelength precision, power output, and packaging technology.
3. Vendor Comparison: You'll often find better prices by comparing vendors and considering bulk purchases.
4. Potential Sources: Check with major electronics component distributors or suppliers like Digi-Key, Mouser, or LCSC, as these distributors often carry a range of UV LEDs.

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• Digi-Key: Offers a range of UV LEDs. Filtering by wavelength (around 365 nm) and comparing prices should help find a competitive option.
• Mouser: Provides various UV LEDs, often with options for bulk purchases that reduce cost per unit.
• Other Suppliers: Consider smaller or specialized suppliers who may offer more competitive pricing for UV LEDs.

1. Set filters for the target wavelength (e.g., 365 nm).
2. Compare the power ratings and luminous intensity.
3. Look at pricing, specifically for bulk options if applicable.

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