The MOD-POE-V2 board extracts power from the LAN cable network, so you can power your embedded device with 5 or 12VDC, and power and Ethernet are carried at the same cable. Note that the LAN cable should be connected to a PoE-compatible switch/router.
The MOD-POE-V2 IEEE 802.3af-2003 standard compliant. MOD-POE-V2 is not compatible with Olimex MOD-POE injector (because it needs higher input voltage - at least 37V DC).
MOD-POE-V2 can work in either PoE modes - Mode A or Mode B. Important notice: There is no galavano isolation between MOD-POE-V2's power input and output! This might be a problem if your hardware setup has more than one source of power applied at the same time! Make sure to take precautions if your hardware setup has more than one power supply (or even only ground) attached!
TPS2375PW chip (Si3402-B in older revisions) that is IEEE 802.3-compliant, including pre-standard (legacy) PoE support
Power output is selectable via a switch - 5 / 12 VDC
I provide 24V to the input of MOD-POE-V2 but there is no output. What is the problem?
TPS2375PW (Si3402-B in older revisions) would NOT work with 24V DC. The recommended voltage is 48V DC and the minimum is around 37V DC. For more info refer to TPS2375PW's (Si3402-B's) datasheet.
What is the maximum current output approximately?
The maximum output is close to 8W. This means ~600mA for the 12V output mode; ~1500mA for the 5V output mode.
It seems my board get damaged by MOD-POE-V2. I have MOD-POE-V2 powered via PoE and it powers another board. This other board is sometimes connected to a personal computer via USB. What could have went wrong?
There is no galvanic isolation (no optocoupler, no transfoermer, etc) between MOD-POE-V2's power input and output! This might be a problem if your hardware setup have more than one source of power applied at the same time! If the board powered via MOD-POE-V2 is also connected to a different power supply that adds a second ground (for example, if it is connected to a computers USB port or another power source) - something may get damaged during the connection! Make sure to take precautions if your setup has more than one ground! It is good idea to disconnect the connections between MOD-POE-V2 and the target, power everything and measure the voltage difference between the grounds of MOD-POE-V2 and the target (before establish the connection). If the voltage difference is too high do NOT connect the target to MOD-POE-V2 and the other power supply at the same time. Maybe try adding optocoupler, maybe try connecting the grounds first before the power, etc.
Consider using Olimex USB-ISO to protect your computer and board from this accidental overvoltage.
Does MOD-POE-V2 work in both PoE modes - A and B?
The latest hardware revisions (with TPS2375PW) can work in either mode! Older hardware revisions (with Si3402) work only in mode B - pins 4–5 form one side of the DC supply and pins 7–8 provide the return; these are the "spare" pairs in 10BASE-T and 100BASE-TX. Mode B requires a 4-pair cable.