Overview
The PoE HAT (B) is a 802.3af-compliant Power Over Ethernet accessory for the Raspberry Pi 3B+/4B. By using this small HAT and some proper 802.3af-compliant power sourcing equipment, it is possible to provide both network connection and power supply for your Raspberry Pi in only one Ethernet cable.

Features
Standard Raspberry Pi 40PIN GPIO header, supports Raspberry Pi 3B+/4B
PoE (Power Over Ethernet) capability，802.3af-compliant
Fully isolated switched-mode power supply (SMPS)
0.91"OLED, for monitoring processor temperature, IP address, and fan status in real-time
Onboard cooling fan, allows auto running on powerup OR programmable control, configured by switch
Integrates PCF8574 IO expander for I2C bus, providing pin P0 for directly fan control, and more spare IO pins

Main Features

1. For use with Raspberry Pi 3B+/4B----Standard Raspberry Pi 40PIN GPIO stackable header, allows connecting other HATs
2. Power Over Ethernet---providing both network connection and power supply for your Raspberry Pi in one cable
3. 0.91" OLED display---128 × 32 pixels, I2C-bus controlled. Monitoring processor temperature, IP address, fan status in real-time
4.Cooling fan---allows auto running on powerup OR programmable control, configured by switch.
automatically turn on/off depending on the Raspberry Pi processor temperature.
5. Onboard PCF8574 chip---PCF8574 IO expander for I2C bus, providing 8 IO pins, of which P0 for fan control and extra spare pins on solder pads (P1-P7, INT)

Specifications

PoE Power input: 37V ~ 57V DC in
PoE Power output: 5V 2.5A DC out
Network standard: 802.3af PoE
Dimensions: 56.5mm x 65mm
OLED size: 0.91inch
OLED pixels: 128x32
OLED driver: SSD1306
OLED display color: White

Resources/User Manual: //bit.ly/3DJ2P2C

Package Content
1. PoE HAT (B) x1
2. Standoffs pack x1