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The MMmm Pi PoE Prototype Board is designed as a Plug & Play solution – just attach the board to your Raspberry Pi’s GPIO header, plug in the Ethernet pass-though cable to your Raspberry Pi’s Ethernet socket, and you are ready to go. There is no software to load, and nothing to configure.
The board operates in 802.3af Mode A. RJ45 pins 1 and 2 (pair 1) form one side of the 48 V DC, and RJ45 pins 3 and 6 (pair 2) form the other side. These are the same two pairs used for data transmission in 100BASE-TX, allowing the provision of both power and data over only two pairs.
|T568A colour||10/100 Mode A (Mixed)|
|Pin 1||White/Green stripe||Rx +||DC +|
|Pin 2||Green solid||Rx –||DC +|
|Pin 3||White/Orange stripe||Tx +||DC –|
|Pin 4||Blue solid||Unused|
|Pin 5||White/Blue stripe||Unused|
|Pin 6||Orange solid||Tx –||DC –|
|Pin 7||White/Brown stripe||Unused|
|Pin 8||Brown solid||Unused|
The board takes 48 V DC provided on pairs 1 and 2, passes it through the regulator circuit which drops the voltage down to 5 V DC, and then feeds the output to GPIO pin 2 (5 V DC) and pin 39 (Ground) on the Raspberry Pi.
The Raspberry Pi is designed to allow powering from the GPIO header. GPIO pin 2 on the Raspberry Pi is connected directly to the main 5 V DC rail that powers the Raspberry Pi, and passing 5 V DC through GPIO pin 2 will power the Raspberry Pi in exactly the same manor as if it was powered using the Micro USB port. However, one significant advantage is that the MMmm Pi PoE regulator can supply up to 1.8 Amps, whereas the Micro USB port is only rated at 800 mA (0.8 Amps x 5 Volts = 4 Watts) on the Raspberry Pi 2 and 3 – and less on previous models. This means you can power more complex projects!
And to help with those more complex projects, the remainder of the space on the board is available as a prototyping area, with 188 individual solder points, two separate 5 V DC / Ground points, and a break out of the GPIO header next to the prototyping area.
|3.3v||N/A||3.3 V DC||1|
The only GPIO header pins used by the MMmm Pi PoE Board are the 5 V DC (2) and Ground (39) pins.
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