SNLU343 June   2024 DP83TD510E

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Quick Setup
    2. 2.2 Header Information
    3. 2.3 Push Buttons
    4. 2.4 Debug Information
  8. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials (BOM)
  9. 4Additional Information
    1. 4.1 Trademarks

2.2 Header Information

This EVM consists of two boards: one is the power sourcing equipment (PSE) and one is the powered device (PD).

Power Sourcing Equipment (PSE)

DP83TD510E-PoDL-EVM PSE Block Diagram Figure 2-4 PSE Block Diagram

Figure 3-4 shows the block diagram of the PSE board. The board is divided in four sub blocks, the power supply, the PSE circuit, the media converter, and the USB2MDIO interface. For implementation details, refer to the schematic and related documentation.

DP83TD510E-PoDL-EVM PSE Jumpers Figure 2-5 PSE Jumpers

All jumpers and headers are shown in Figure 3-5. The default settings are shown in the figure. Jumper J10 can be used to switch the SPE PHY between 1.0 Vpp signaling and 2.4 Vpp signaling. The default settings configure the PHY for 2.4 Vpp.

Two jumpers, J15 and J16, are allowed to disconnect the PSE stage from the coupling network. This allows to either use the PSE block in combination with a coupling network or to use an own PSE implementation with the onboard SPE PHY and coupling network. Also, these jumpers are a good point to probe the behavior of the PSE block without interfering with the data signal.

The USB2MDIO and PSE digital block have a microcontroller and are pre-programmed. Refer to the images below for the correct pinout of the programming headers if an update or change of the firmware is needed.

DP83TD510E-PoDL-EVM Programming header USB2MDIO Figure 2-6 Programming header USB2MDIO
DP83TD510E-PoDL-EVM Programming Header PSE Figure 2-7 Programming Header PSE

The signals between the PSE digital part and analog parts are brought out on a connector for easy probing. This helps in case of problems to investigate what is happening. Figure 3-8 shows the pinout of this connector.

DP83TD510E-PoDL-EVM Debug header PSE Figure 2-8 Debug header PSE

The table below details the signals present on the PSE debug header.

Signal Description Normal operation, PD connected and powered

Imon

Output from eFuse, outputs a voltage proportional to connected load

0 - 3 V

Iset

Input to eFuse to set current limit with a voltage

0 - 1 V

!Fault

Fault output from eFuse

3.3 V

!SHDN

Disabled output of eFuse

3.3 V

SCCP_DOUT

Output from MCU to send SCCP data

0 V, communication before power up

SCCP_DIN

Input to MCU for reading SCCP data

3.3 V, communication before power up

VID_valid

Signals a valid detection voltage

0 V, short pulse before power up

!CS_on

Enables current source for detection and classification

0 V, short pulse before power up

MVFS_valid

Signals current flow to MCU

3.3 V

Prebias_ok

Signals valid prebias current

0 V, short pulse before power up

Prebias_en

Enables prebias/sleep voltage source

0 V, short pulse before power up

If the user wants to modify the firmware of the PSE controller, then there are additional pins of the microcontroller brought out for extensions, such as an additional PSE port. Figure 3-9 shows the pinout.

DP83TD510E-PoDL-EVM Extension Header PSE Figure 2-9 Extension Header PSE

Powered Device (PD)

DP83TD510E-PoDL-EVM PD Block Diagram Figure 2-10 PD Block Diagram

Figure 3-10 shows how the power device is built up. The block diagram consists of similar blocks as the PSE, but includes a modified power supply and replaces the PSE by a PD block.

DP83TD510E-PoDL-EVM PD Jumpers Figure 2-11 PD Jumpers

For the jumper settings, refer to Figure 3-11. Similarly as the PSE side, follow the settings shown. J10 can be used to select 1.0 Vpp instead of 2.4 Vpp. The jumpers J15 and J16 can be used to separate the PD from the coupling network. The jumpers J1 and J3 allow to disconnect the Vout connector and allows adding an isolated power supply instead of the jumpers.

Additionally, the microcontrollers involved, so there are programming headers as well. The USB 2 MDIO programming header is exactly the same as for the board mentioned before. The pinout for the PD controller header is shown in Figure 3-12.

DP83TD510E-PoDL-EVM Programming Header PD Figure 2-12 Programming Header PD

The PD board allows access to the SCCP signals for debugging purpose. The pinout of the connector is shown in Figure 3-13.

DP83TD510E-PoDL-EVM Debug Header PD Figure 2-13 Debug Header PD