Power net portal is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design. Power nets of the same designator automatically connect throughout your design #portal #power
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
Given the components listed in your project, you have two Hirose Electric DF40C-100DS-0.4V51 connectors (designated as J1 and J2) and a Silvertel AG9712-2BR module. To determine the need for pull-up or pull-down resistors on unconnected pins, we need to consider the typical usage and datasheets of these components.
For Hirose Electric DF40C-100DS-0.4V51 Connectors (J1 and J2)
These are connectors, and the need for pull-up or pull-down resistors on their pins depends on what they connect to. Generally, for connector pins directly interfacing with microcontrollers (MCUs) or other integrated circuits (ICs), it's the connected IC's datasheet (in this case, possibly a compute module like Raspberry Pi CM4's GPIOs) that specifies whether certain lines require pull-up or pull-down resistors. Such resistors are often used for I2C bus lines (SDA/SCL with pull-ups), GPIOs configured for certain functionalities, or to ensure a defined state on unused pins.
For Silvertel AG9712-2BR Module
VA1, VA2, VB1, and VB2: These pins are typically associated with the VoIP analog output interface. In most applications, they won't require pull-up or pull-down resistors but should be appropriately filtered and connected according to the module's application circuits.
IC_1 and IC_2: These pins are internally connected and often don't require any external resistors. They are typically used for factory testing or specific configurations based on the datasheet or application notes.
NC (No Connection): This pin should not be connected and thus does not require any resistor.
-VDC and +VDC: These are power supply pins and will not need pull-up or pull-down resistors. Ensure they are connected to the appropriate power source as specified in the datasheet.
ADJ: Depending on the specific use case (e.g., output voltage adjustment), this pin might be left unconnected or connected through a resistor to ground or VDC. Check the datasheet for any specific guidance.
Recommendations:
Cross-reference the datasheets: For all ICs and modules you are interfacing with (especially for the CM4 module connected to the DF40C-100DS-0.4V51 connectors), carefully check their datasheets or application notes for any specific instructions on pull-up or pull-down resistors.
Please check the datasheets or application notes for the specific components you're interfacing with (Raspberry Pi CM4 for J1 and J2, and the specific application circuit for AG9712-2BR) for definitive guidance. Without exact details on the connections and external circuitry, the recommendations above are based on common practices and may need adjustments to fit your exact requirements.
To connect a Compute Module 4 (CM4) to Power-over-Ethernet (PoE), you would typically utilize a PoE HAT (Hardware Attached on Top) specifically designed for the CM4 or use an external PoE splitter. The PoE HAT is a compact solution integrating the PoE functionality directly with the CM4 IO board, but if you're designing your own PCB and want to include PoE functionality, you would need to design a circuit that can handle the PoE requirements.
Assuming you are designing the PCB and want to integrate PoE directly into your design, you'll need the following components:
RJ45 Ethernet Connector with PoE capabilities: This connector should support PoE so that it can receive power over the Ethernet cable. Make sure it matches the PoE standard you intend to use (e.g., IEEE 802.3af or IEEE 802.3at).
PoE Module/IC: This is required to extract power from the Ethernet cable. Depending on your design constraints, you can choose a module that directly provides an appropriate voltage to power the CM4 or to an intermediate power management circuit. Popular PoE IC manufacturers include Silvertel, Microchip, and Texas Instruments.
Isolation Transformer: Required for safety, ensuring that the data lines are electrically isolated from the power lines.
Power Management Circuit: Based on your PoE module's output, you might need a step-down converter or a regulator to provide stable power to the CM4, which typically requires 5V.
Your design steps in regard to PoE connectivity would broadly involve:
Connect the RJ45 Ethernet Connector to the input of the PoE Module.
Connect the PoE Module's output to the Power Management Circuit to regulate the voltage down to what is required by the CM4.
Connect the Power Management Circuit's output to the CM4 power input.
Given the technical specifics and standards involved (like IEEE 802.3af/at for PoE), it's crucial to refer to the datasheets of the PoE module/IC and the CM4 for exact requirements and compatibility.
Remember, handling PoE can be quite intricate due to the high voltages involved and the necessity for proper isolation to ensure safety and device protection. If you're not confident in designing with PoE, using a commercial PoE HAT or splitter might be a safer and quicker solution.
For integrating Power-over-Ethernet (PoE) into your design with a Raspberry Pi Compute Module 4 (CM4), let's use a popular PoE module for simplicity, like the Silvertel Ag9900. This PoE module is compact, efficient, and supports the IEEE 802.3af standard, providing an isolated 12V output (there are also versions for other voltages).
Required Components:
PoE Module: Silvertel Ag9900 or equivalent.
RJ45 Connector with Magnetics: Suitable for Ethernet communication and designed for PoE applications.
DC-DC Converter (Buck Converter): To step down the voltage from 12V (output from the PoE module) to 5V suitable for the CM4.
Diode (Schottky): For protection and ensuring current flows in the correct direction.
Capacitors: For smoothing the output from the DC-DC converter.
Connection Steps:
Ethernet to PoE Module:
Connect the RJ45 connector to the Silvertel Ag9900 input according to the Silvertel datasheet. This typically involves connecting the center taps of the transformer built into the RJ45 connector to the PoE module input pins.
PoE Module to DC-DC Converter:
Output Voltage (Vout) from the PoE module (e.g., 12V from the Ag9900) connects to the input of your DC-DC buck converter. Please ensure to check the input voltage range of your buck converter to ensure compatibility.
Place Schottky diode on the positive line between the PoE module's output and the DC-DC converter's input to prevent reverse current.
DC-DC Converter Output to CM4:
Connect the output of the buck converter (adjusted to 5V) to the 5V power input of the CM4 interface. Exactly where this is will depend on your specific interface board or design.
Include capacitors on the output of the DC-DC converter as recommended in the converter's datasheet to smooth out any ripples in the voltage.
Grounding:
Make sure the ground from the RJ45 connector, PoE module, DC-DC converter, and CM4 are all connected to a common ground point in your design.
Important Notes:
Check Compatibility: Before purchasing components, confirm their compatibility and ensure they meet your project's power requirements.
Safety First: PoE involves high voltage (up to approximately 50V before regulation). Exercise caution during design and testing.
Datasheets: Always refer to the datasheets of the components for specific connection details and configurations. Datasheets will provide critical information on pinout, voltage levels, and additional circuit protection measures you might need to take.
Testing: Carefully test the PoE integration in a controlled environment before deploying it in a live setting.
Using PoE requires careful attention to electrical standards and safety precautions. If you're not familiar with high-voltage circuits, seeking assistance from a professional or using a pre-made solution might be advisable.
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Passive Components
Resistor Power Rating
Beta
Checks that the power traveling across a given resistor is under its rating with 50% headroom.
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