PD77020

Application Information

Data Sheet

© 2023 Microchip Technology Inc. and its subsidiaries

DS60001824A - 4

1.

Application Information

This section provides practical operation information for a PSE based on the PD77728 and the

PD77020 devices.

1.1

Controller Mode

This section provides a high-level description of the Controller Mode operation in a PSE based on the

PD77728 and the PD77020 devices.

The PD77020 device is used in conjunction with PD77728 to create an inclusive system, where

the PD77020 PoE Power Management Controller provides high level, sophisticated, and multi-port

PoE functions, such as port mapping (Port Matrix), port priority, port status, and system power

management.

The following figure shows the Controller mode operation.

Figure 1-1. Controller Mode Operation

PD77728

PD77728

PD77728

PD77728

OSS

RESET_IN_N

A1

A2

A3

A4

A1 – A4:

Set I

2C device address

A1

A2

A3

A4

A1

A2

A3

A4

A1

A2

A3

A4

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

VMAIN

VMAIN

VMAIN

3.3V

...

...

3.3V

3.3V

3.3V

10K

10K

10K

10K

...

...

SDA

SCL

I2C

iso

Isolation Barrior

dig

iso

PD77020

Host

Processor

LED_SCK

xLED_SS

LED_DO

xLED_OE

LED

Stream

I2C_ADDR_Meas

3.3V

R1

10K

AUTO

AUTO

AUTO

AUTO