ESP32-POE-ISO  

FAQ

• ESP32-PoE-ISO doesn't work well with bauds over 115200. What to do?
• Some older drivers might have wrong timings, causing worse throughput. Download and install the latest drivers for CH340. If you are using Linux make sure to try with these drivers: high-speed driver for Linux

• Is it safe to have USB powering and PoE powering connected and enabled at the same time?
• Yes, when using ESP32-POE-ISO it is safe to have them both enabled.

• I got WROVER board and my Ethernet code and my I2C code doesn't appear to work. My device is broken, how do I return it?
• Your ESP32-POE-ISO-WROVER is not broken and we test each device with Ethernet, chances of broken device are very low. However, there is hardware difference in the pinout between boards with WROOM and WROVER modules - the WROVER module requires two extra pins for the PSRAM memory. One of the pins affects the Ethernet, the other - the I2C.
  
  When WROVER module is used (instead of the default WROOM) then GPIO16 and GPIO17 are unavailable (both are used for the PSRAM inside the module). In that case we have set GPIO33 to go on UEXT1 pin #5 (instead of GPIO16). Also the clock for the Ethernet is now GPIO0 (instead of GPIO17). Modify your software for these differences.

• Where are I2C, UART, SPI pins exposed?
• The ESP32 chip has very advanced multiplexing and you can define any free GPIO pin for I2C, UART, SPI operation as long as you are within the maximum supported (some penalties to SPI's maximum freqncy apply, when not using the dedicated pins). Notice that some ESP32 pins can only be inputs. Defining pins is for another job is purely software effort.

• I provide 24V to the input of ESP32-PoE-ISO's Ethernet but it doesn't seem powered. What is the problem?
• TPS2375PW (Si3402) 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.

• I power the board from the Ethernet connector. What current do I have availabe for additional circuits?
• The isolated DCDC that we use provides up to 2W in total but some power is used for the module itself and the battery charger. So you can use 1W for own circuits around 200mA @ 5V or 300mA @ 3.3V (combined draw from 3.3V and 5V lines shouldn't be more than 1W) safely.

• I power the board from the battery connector. The LEDs remain off. Is it borken?
• Probably not. This is a low-power design. The LEDs would not turn on when operating on battery to save power. You need other ways to determine if it works or not. For example, something over the serial lines or over the Ethernet (with no PoE enabled else it would get powered from there).

• R41 gets very hot when board is powered from Power-Over-Ethernet! What is this component? Is it safe? Can I remove it?
• This resistor is required by the IEEE standards. It is used for MPS (maintain power signature). Search online "maintain power signature poe" to get the general idea. It consumes around 0.5W, when the board is powered from Power-Over-Ethernet (notice R41 consumes 0 when the board is powered from other sources).
  
  We didn't ensure MPS in the first hardware revisions of the board (e.g. had no resistor R41 in place), but this caused availability problems when using some power saving modes - the board consumed less wattage than PoE equipment can detect, which led to PoE equipment shutting the board off.
  
  If you have soldering experience and the resistor bothers you, you might try desoldering it and see if that effects your setup negatively. Notice that we don't recommend doing so.