PD77728 datasheet(21/44 Pages) MICROCHIP

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PD77728

Application Information

Data Sheet

DS00003920E - 21

5.1.2

Semi-Auto Mode

In the Semi-Auto mode, the device performs periodic connection check, detection, and classification,

but does not power-up the ports without a host command. Each device has initial PSE configuration

containing the Port Matrix (2P/4P configuration) and stores the port investigation results in the

memory for host control. The host can override these settings. In this mode, the PoE controller is

responsible for the periodic or cyclic detection and classification of the ports.

The following figure shows the Semi-Auto mode application.

Figure 5-2. Semi-Auto Mode Application

PD77728

OSS (optional)

RESET_IN_N

A1 – A4:

Set I

2C device address

0 1 2 3 4 5 6 7

port_neg

0 1 2 3 4 5 6 7

port_neg

0 1 2 3 4 5 6 7

port_neg

0 1 2 3 4 5 6 7

port_neg

VMAIN

3.3V

...

3.3V

10K

Isolation Barri

I2C

iso

dig

iso

10K

...

SDA

SCL

Host Processor

INT_OUT_N (optional)

...

AUTO

...

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