1.

Functional Descriptions

The following figure shows the functional blocks of the PD39208.

Figure 1-1. PSE Manager Block Diagram

1.1

Digital Block Module

The logic main control block includes digital timing mechanisms and state machines that synchronize and activate

PoE functions.

• Real-Time Protection

• Start-Up Macro

• Load Signature Detection

• Classification

• Voltage and Current Monitoring

• ADC interfacing

• Direct digital signals with analog block

• SPI communication block

• Registers

1.2

PD Detection Generator

On request from the controller to the main control module, the PD detection generator generates four different

voltage levels to ensure a robust AF/AT PD detection functionality.

1.3

Classification Generator

On request from the controller to the main control module, state machine applies a regulated class event and mark

event voltage to ports, as required by IEEE

PD39208

Functional Descriptions

Datasheet

DS00003555B-page 5