OLIMEX ESP32-POE Board User Manual

: June 13, 2024
: OLIMEX

Table of Contents

Introduction to ESP32-POE
HARDWARE
ESP32-POE-ISO GPIOs:
ESP32-POE(-ISO) power supply:
SOFTWARE:
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

**OLIMEX ESP32-POE Board User Manual

**

ES32-POE
ESP32-POE-ISO
olimex.com

Introduction to ESP32-POE

ESP32-PoE is an IoT based on ESP32-WROOM-32E WIFI/BLE/Ethernet development board with Power-Over-Ethernet feature.

The PoE is handled by TPS2375/6 chip (Si3402-B in older revisions) that is IEEE 802.3af-compliant, including pre-standard (legacy) PoE support.

The PoE powering requires at least 37V DC to operate successfully. The board takes power from the Ethernet cable and can be expanded with sensors and actuators. Perfect solution for Internet-of-Things projects.
Important notice: ESP32-PoE has no galvano isolation from Ethernet’s power supply, when you program the board via the micro USB connector the Ethernet cable should be disconnected (if you have power over the Ethernet cable)! Consider using Olimex USB-ISO to protect your computer and board from accidental short circuit. Also consider instead using Olimex ESP32-PoE-ISO board which is insulated.

ESP32-POE-EA has ESP32-WROOM-32UE module with U.FL connector and external antenna attached.
ESP32-POE-IND and ESP32-POE-EA-IND use industrial grade components suitable for -40+85C operating temperature.

ESP32-POE-WROVER comes with ESP32-WROVER-E with 4MB flash and 8MB PSRAM, while
ESP32-POE-WROVER-EA uses ESP32-WROVER-IE module with U.FL connector and external antenna attached.

ESP32-POE features

ESP32-WROOM-32E Espressif Inc WiFi + Bluetooth ® + Bluetooth LE module with 4MB Flash 520 KB SRAM
High reliable industrial grade -40+85C available (-IND)
CE-RED and LVD certification
Original design by OLIMEX Ltd
Power Over Ethernet negotiation circuit 802.3 compliant, with minimum operating voltage of 35VDC
DC-DC converter with output 5V 3A
LiPo battery charger
LiPo battery connector
Battery level monitor pin on ADC
External power supply detection pin on ADC
UEXT connector
User button
Reset button
Micro USB with programmer for ESP32 programming
MicroSD card
Two extension connectors 0.1″ step spaced at 1″
PCB dimensions: (80 x 28)mm ~ (3.15 x 1.1)”

ESP32-POE-ISO features

ESP32-WROOM-32E Espressif Inc WiFi + Bluetooth ® + Bluetooth LE module with 4MB Flash 520 KB SRAM
Power Over Ethernet negotiation circuit 802.3 compliant, with minimum operating voltage of 35VDC
High reliable industrial grade -40+85C available (-IND)
CE-RED and LVD certification
Original design by OLIMEX Ltd
Low power design – 200uA consumption in deep sleep
Ethernet 100Mb interface with IEEE 802.3 PoE support
3000VDC galvanic insulation between the PoE Ethernet part and board’s power supply circuit Micro USB connector for ESP32 programming
MicroSD card working in 1 bit mode
LiPo battery charger with LiPo battery connector
Battery level monitor pin on ADC
External power supply detection pin on ADC
DC-DC 2W 5V/400mA
UEXT connector
User button
Reset button
Two extension connectors, 0.1″ step spaced at 1″
PCB dimensions: (98 x 28)mm ~ (3.8 x 1)”

PoE standard

ESP32-POE and ESP32-POE-ISO follow the original IEEE 802.3af PoE standard and provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA). Only 12.95 W is assured to be available at the powered device as some power dissipates in the cable.

ESP32-POE-ISO have 2W DC-DC 5V-5V insulation converter which limits the power usage to 2W only!The difference between ESP32-POE and ESP32-POE-ISO:
ESP32-POE is not galvanic isolated which means that it’s not safe to connect it to other devices which
use non isolated power supply.

this means YOU SHOULD NOT CONNECT ESP32-POE to computer USB port while it’s connected to Ethernet POE!!! If you connect USB while ESP32-POE is powered by Ethernet you will damage the board or your computer or both. This also will void the warranty!!!

ESP32-POE-ISO is with 3000VDC galvanic insulation between the Ethernet POE part and ESP32 power supply, so there is no problem to connect to USB and program/debug while connected to Ethernet POE

The difference between ESP32-POE and ESP32-POE-WROVER:

ESP-POE is with ESP32-WROOM-32E module with 4MB Flash and 520KB RAM

ESP-POE-WROVER is with ESP32-WROVER-E module with 4MB Flash and 8MB PSRAM.

WROVER module uses two GPIOs to connect to the PSRAM and these can’t be used

Order codes for ESP32-POE and accessories:

ESP32-POE commercial grade 0-70C board with internal antenna
ESP32-POE-EA commercial grade 0-70C board with external antenna
ESP32-POE-IND industrial grade -40+85C board with internal antenna
ESP32-POE-EA-IND industrial grade -40+85C board with external antenna
ESP32-POE-WROVER commercial grade 0-70C board with 8MB PSRAM and internal antenna
ESP32-POE-WROVER-EA commercial grade 0-70C board with 8MB PSRAM and external antenna
BATTERY-LIPO1400mAh – Lipo battery 3.7V 1400mAh – note these batteries can be shipped only by ground so we can deliver only to EU destinations.
UEXT modules – different sensors, relays, LCDs, RTC, GSM, GPS etc accessories which can be connected to UEXT connector

Order codes for ESP32-POE-ISO and accessories:

ESP32-POE-ISO commercial grade 0-70C board with internal antenna
ESP32-POE-ISO-EA commercial grade 0-70C board with external antenna
ESP32-POE-ISO-IND industrial grade -40+85C board with internal antenna
ESP32-POE-ISO-EA-IND industrial grade -40+85C board with external antenna
ESP32-POE-ISO-WROVER commercial grade 0-70C board with 8MB PSRAM and internal antenna
ESP32-POE-ISO-WROVER-EA commercial grade 0-70C board with 8MB PSRAM and ext. antenna
BATTERY-LIPO1400mAh – Lipo battery 3.7V 1400mAh – note these batteries can be shipped only by ground so we can deliver only to EU destinations.
UEXT modules – different sensors, relays, LCDs, RTC, GSM, GPS etc accessories which can be connected to UEXT connector

HARDWARE

**ESP32-POE layout:

ESP32-POE GPIOs:

**

POWER SUPPLY:
+5V

may be input and output
when board is connected to USB or to Ethernet PoE this line can be used as output and power suplement electronic
if you want to use as input i.e. to feed power from external 5V to this line make sure board is not connected to USB!
when you use as output i.e. you feed external electronics from it up to 0.8A @ 5V (i.e. 4W) can be sourced maximum. This includes the 3.3V power output. The combined power must not exceed 4W.

+3.3V output which can source up to 0.5A @ 3.3V i.e. (1.65W) Make sure the combined power sourced from +3.3V and +5V do not exceed 4W

GPIOs:
ESP_EN resets ESP32 module
GPIO0, GPIO1 are used only during programming, after that are free to use
GPIO2, GPIO14, GPIO15 are used for the SD-card, if no SD card they are free to use
GPIO2, GPIO4, GPIO5, GPIO13, GPIO14, GPIO15, GPIO16, GPIO36 are shared on both UEXT and EXT1,2 so if you use them on the one connector do not use on the other
GPI39 is connected to measure external power supply oltage
GPI34 is connected to used button and have 10K pullup
GPI35 is free to use but may be connected to measure the LiPo battery voltage if SENS_BAT_E1 solder jumper

ESP32-POE-WROVER has no GPIO16 connected!

**ESP32-POE-ISO layout:

**

ESP32-POE-ISO GPIOs:

POWER SUPPLY:
+5V

may be input and output
when board is connected to USB or to Ethernet PoE this line can be used as output and power suplement electronic
if you want to use as input i.e. to feed power from external 5V to this line make sure board is not connected to USB!
when you use as output i.e. you feed external electronics from it up to 0.2A @ 5V (i.e. 1W) can be sourced maximum. This includes the 3.3V power output. The combined power must not exceed 1W.

+3.3V output which can source up to 0.33A @ 3.3V i.e. (1W) Make sure the combined power
sourced from +3.3V and +5V do not exceed 1W
GPIOs:
ESP_EN resets ESP32 module
GPIO0, GPIO1 are used only during programming, after that are free to use
GPIO2, GPIO14, GPIO15 are used for the SD-card, if no SD card they are free to use
GPIO2, GPIO4, GPIO5, GPIO13, GPIO14, GPIO15, GPIO16, GPIO36 are shared on both UEXT and EXT1,2 so if you use them on the one connector do not use on the other
GPI39 is connected to measure external power supply oltage
GPI34 is connected to used button and have 10K pullup
GPI35 is free to use but may be connected to measure the LiPo battery voltage if SENS_BAT_E1 solder jumper

ESP32-POE-WROVER has no GPIO16 connected!

ESP32-POE(-ISO) schematics:
ESP32-POE latest schematic Rev.L is on GitHub
ESP32-POE board revision changes are on GitHub
ESP32-POE-ISO schematic Rev.L is on GitHub
ESP32-POE-ISO board revision changes are on GitHub

ESP32-POE(-ISO) power supply:

ESP32-POE(-ISO) can be powered by 4 sources:

Ethernet PoE
USB-micro connector
LiPo battery
EXT1 pin 1 (+5V) note that this signal is connected to USB 5V signal so when you power with this pin you should not connect the board to the USB!

Power consumption of ESP32-POE(-ISO) is between 50 and 200mAdepend on the operation mode.
If LiPo battery is connected it’s charged automatically when power supply is attached with about 100mA.

When the LiPo battery is attached and external power supply is missing internal DCDC step-up converter and switching circuit automatically powers ESP32-POE from the battery. 1400mAh battery will provide about 8 hours of stand alone operation.

The LiPo battery connector is JST 2.0 mm connector and with Olimex’s battery polarity. If

you use batteries from other manufacturers please make PLUS and MINUS are connected properly as you may damage the board!!!

UEXT connector:
UEXT connector stands for Universal EXTension connector and contain +3.3V, GND, I2C, SPI, UART signals.
UEXT is 0.1” 2.54mm step boxed plastic connector. All signals are with 3.3V levels.

Olimex has developed number of MODULES with this connector. There are temperature, humidity,
pressure, magnetic field, light sensors. Modules with LCDs, LED matrix, Relays, Bluetooth, Zigbee, WiFi, GSM, GPS, RFID, RTC, EKG, sensors and etc.