Power Ports P5V and P5V0SB

Oct 13, 2025 by wbrum.org 103 views

===========================================================

As a critical component of any electronic project, the design and printed circuit board (PCB) play a crucial role in determining the overall performance and reliability of the device. In this review, we will delve into the design and PCB of the primary project, highlighting areas of improvement and providing recommendations for enhancement.

Schematic Review

The schematic of the primary project is a critical component that outlines the electrical connections and components used in the design. Upon reviewing the schematic, several areas of improvement have been identified.

Capacitor Selection and Placement

Capacitors C9 and C10: The values of these capacitors should be 2.2nF. This is a critical component in the design, and incorrect values can lead to performance issues.
Capacitor C11: This capacitor is not necessary and can be removed from the design.
Pull-ups on Open Drain Outputs: There are no pull-ups on the Open Drain outputs of IC5 (pins: 5, 7, 6, 14). This can lead to issues with the output voltage and stability. R6 may play a role of pull-up, but it is not comprehensive.

Input Filter and EEPROM

Input Filter for IC4: Consider adding an input filter for IC4 to improve the overall performance and stability of the design.
EEPROM: No EEPROM is predicted in the design. This can lead to issues with data storage and retrieval.

Power Ports and Filtering Diode

Power Ports P5V and P5V0SB: These power ports should be connected to ensure proper power supply to the device.
Filtering Diode: There is no filtering diode at the board entry. This can lead to issues with power supply and stability.

PCB Review

The PCB of the primary project is a critical component that brings the design to life. Upon reviewing the PCB, several areas of improvement have been identified.

I2C Lines and Capacitor Placement

I2C Lines: The I2C lines are parallel, which can lead to issues with signal integrity and stability. Consider separating the I2C lines to improve performance.
Capacitors C9 and C10: These capacitors hang next to the track, which can lead to issues with signal integrity and stability. Consider passing the capacitors through their pads to improve performance.

Power Supply Filtering Capacitor

Power Supply Filtering Capacitor: The power supply filtering capacitor should be as close to the power pin as possible to improve performance and stability.

T Connection and Measuring Traces

T Connection: The T connection on the Bottom side is not necessary and can be removed.
Measuring Traces: Measuring traces should avoid passing under coils to improve performance and stability.

Grounding and ESD Strip

Grounding: Between measuring traces, there should be a GND to improve performance and stability.
ESD Strip: There is a lack of ESD strip on the PCB, which can lead to issues with electrostatic discharge.

DRC and Labeling

DRC: The DRC (Design Rule Check) could be cleared to improve the overall quality of the PCB.
Labeling: The DIOT logo and PCB description will be hidden if the PSU module is assembled. Consider adding a label to the PCB to improve visibility.
J12 Description: The description of J12 is not clear and should be improved.

Conclusion

In conclusion, the primary project review has identified several areas of improvement in the design and PCB. By addressing these issues, the overall performance and reliability of the device can be improved. The recommendations outlined in this review should be implemented to enhance the design and PCB quality of the primary project.

Recommendations

Implement the recommended changes to the schematic and PCB.
Consider adding an input filter for IC4 and an EEPROM to the design.
Improve the power supply filtering capacitor placement and add a filtering diode at the board entry.
Separate the I2C lines and pass capacitors C9 and C10 through their pads.
Remove the T connection on the Bottom side and improve the measuring traces.
Add a GND between measuring traces and an ESD strip to the PCB.
Clear the DRC and improve the labeling on the PCB.

By implementing these recommendations, the primary project can be improved, and the overall performance and reliability of the device can be enhanced.

=============================

In the previous article, we reviewed the design and PCB of the primary project, highlighting areas of improvement and providing recommendations for enhancement. In this Q&A article, we will address some of the most frequently asked questions related to the primary project review.

Q: What are the main issues with the schematic of the primary project?

A: The main issues with the schematic of the primary project include:

Capacitors C9 and C10 should be 2.2nF.
Capacitor C11 is not necessary.
No pull-ups on Open Drain outputs of IC5 (pins: 5, 7, 6, 14).
No input filter for IC4.
No EEPROM predicted.
No filtering diode at the board entry.
Power ports P5V and P5V0SB should be connected.

Q: What are the implications of not separating the I2C lines?

A: Not separating the I2C lines can lead to issues with signal integrity and stability. This can result in errors, data corruption, and other performance issues.

Q: Why is it important to pass capacitors C9 and C10 through their pads?

A: Passing capacitors C9 and C10 through their pads can improve signal integrity and stability. This is because the capacitors will be closer to the components they are connected to, reducing the risk of signal degradation.

Q: What is the purpose of the power supply filtering capacitor?

A: The power supply filtering capacitor is used to filter out noise and ripple from the power supply. This is important to ensure that the device operates reliably and efficiently.

Q: Why is it necessary to add a GND between measuring traces?

A: Adding a GND between measuring traces can improve signal integrity and stability. This is because the GND will help to reduce noise and interference, ensuring that the measurements are accurate.

Q: What is the purpose of the ESD strip on the PCB?

A: The ESD strip on the PCB is used to protect the device from electrostatic discharge (ESD). This is important to ensure that the device operates reliably and efficiently.

Q: How can I implement the recommended changes to the schematic and PCB?

A: To implement the recommended changes to the schematic and PCB, follow these steps:

Review the schematic and PCB to identify areas of improvement.
Make the necessary changes to the schematic and PCB.
Verify that the changes have been implemented correctly.
Test the device to ensure that it operates reliably and efficiently.

Q: What are the benefits of implementing the recommended changes?

A: The benefits of implementing the recommended changes include:

Improved performance and reliability of the device.
Reduced risk of errors and data corruption.
Improved signal integrity and stability.
Enhanced overall quality of the device.

Q: How can I ensure that the device operates reliably and efficiently?

A: To ensure that the device operates reliably and efficiently, follow these best practices:

Implement the recommended changes to the schematic and PCB.
Verify that the changes have been implemented correctly.
Test the device to ensure that it operates reliably and efficiently.
Monitor the device for any issues or performance problems.

By following these best practices and implementing the recommended changes, you can ensure that the device operates reliably and efficiently, providing the best possible performance and reliability.