Data Sheet

© 2023 Microchip Technology Inc. and its subsidiaries

DS60001824A - 1

Introduction

The PD77020 PoE Power Management Controller provides multi-port PoE functions, such as, port mapping

(Port Matrix), port priority, port status, and system power management. The PD77020 device can be used in

conjunction with PD77728 seventh generation PoE Manager/Controller from Microchip. The PD77020 device is

based on a Microchip SAMD21 controller and is packaged in a 5 mm × 5 mm 32-pin QFN package.

The following figure shows a typical PoE application with PD77020.

Figure 1. Typical PoE Application with PD77020

SDIO

SCLIO

RESET_IN_N

OSS

IREF

DGND

AGND

VDD

VDDA

VMAIN

PD77728

PoE Manager/Controller

VMAIN

VMAIN

PORT_NEG0

PORT_NEG7

POE_3.3V

POE_3.3V

VMAIN

Up to 12 Devices

Isolation Barrier

I2C

Isolation

PD77020

Isolation

POE_DGND

POE_AGND

OSS_OUT

xRESET_OUT

I2C_OUT_SDA

I2C_OUT_SCL

VDD

HOST_3.3V

HOST_GND

I2C_IN_SDA

I2C_IN_SCL

SDA

Host

Processor

SCL

ISO_3.3V

HOST_3.3V

HOST_GND

ISO_3.3V

HOST_3.3V

HOST_GND

GND

HOST_GND

GND

HOST_GND

VSSD

HOST_GND

VSSD

HOST_GND

CONTROL

CONTROL

LED_CONTROL

5

4

PGx

PoE PSE Power Management Controller

PD77020