PD77020

Pins

Data Sheet

© 2023 Microchip Technology Inc. and its subsidiaries

DS60001824A - 9

...........continued

PD77020

Designation

Type

Description

28

VSSD

GND

Ground

29

VDD_CORE

Power

Internal 1.2V core voltage

Connect 1 μF capacitor to VSSD.

30

VDD

Supply

Main 3.3V supply

31

SWD_CLK

SWD

Connect 1 kΩ pull-up to 3.3V.

32

SWD_DIO

SWD

Leave open

ePAD

ePAD

GND

Connect to VSSA. It must have sufficient copper mass to

ensure adequate thermal performance.

The following figure shows the I2C address selection of the PD77020 PoE Controller.

Figure 3-2. I2C Address Selection

PoE

Controller

PD77020

I2C_ADDR_M

EAS

10 K

Ω

R1

11

3.3 VDC

The following table lists the specific value of R to choose I2C and set the address.

Table 3-2. I2C Address Selection

I2C Address (Hexadecimal)

R1–KΩ (1%)

0x4

147

0x8

86.6

0xC

57.6

0x10

43.2

0x14

34

0x18

26.7

0x1C

22.1

0x20

18.2

0x24

15.4

0x28

13

0x2C

11

0x30

9.31

0x34

7.87

0x38

6.49

0x3C

5.49