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Olimex ESP32-EVB Rev B Evaluation Board Schematic

Schematic for the Olimex ESP32-EVB Rev B, an ESP32-based development board featuring Ethernet, CAN bus, dual relays, LiPo charging, and infrared communication.

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Overview

This document provides the complete circuit schematic for the Olimex ESP32-EVB Rev B evaluation board. The design is based on the Espressif ESP-WROOM-32 module and incorporates a Microchip LAN8710A-EZC 10/100 Ethernet PHY for wired connectivity. For industrial applications, the board includes a Microchip MCP2551-I/SN CAN transceiver and two RAS-0515 relays for load switching. The power section utilizes a Silergy SY8009AAAC buck converter for 3.3V regulation and a Microchip MCP73833 for LiPo battery charging. Additional features include a WCH CH340T USB-to-UART bridge, a micro SD card interface, an infrared transceiver (RPM7236-H8/IR333-A), and a 40-pin expansion header for GPIO access.

Use Cases

  • Industrial IoT Gateway
  • Remote Relay Control System
  • CAN Bus to Wi-Fi/Ethernet Bridge
  • Battery-powered Wireless Monitoring
  • Home Automation Controller

Topics

ESP-WROOM-32
LAN8710A-EZC
MCP73833
SY8009AAAC
CH340T
MCP2551-I/SN
ESP32-EVB
Olimex
Ethernet PHY
CAN Transceiver
Relay Control
LiPo Charger

Referenced Parts

IR333-A

Everlight

LED3 LED/IR333-A/5mm

SMBJ6.0A

Stmicroelectronics

D2 SMBJ6.0A(DO-214AA)

ESP-WROOM-32

Espressif Systems

ESP-WROOM-32 MODULE

MCP73833

Microchip

U1 MCP73833(MSOP10)

BD5230G-TR

Rohm Semiconductor

U8 BD5230G-TR(SSOP5/SOT-23-5)

RPM7236-H8

Rohm Semiconductor

U7 RPM7236-H8

SY8009AAAC

Silergy

U2 SY8009AAAC(SOT23-5)

CH340T

WCH

U5 CH340T(SSOP20W)

1N5819S4

Diodes Incorporated

D1 1N5819S4(SOD-123)

IRLML6402

Infineon Technologies

FET1 IRLML6402

BAT54C

Nexperia

BAT54C(SOT23-3)

RAS-0515

Relpol

REL1A RAS-0515

DG306-5.0-2P

Degson Electronics

PWR2 NA(TB2 DG306-5.0-2P)

DG306-5.0-3P

Degson Electronics

CON1 TB3 DG306-5.0-3P

SS34

Generic

1N5822/SS34/SMA

T1107A

Generic

BUT1 T1107A(6x3,8x2,5MM)

MISB-SWMM-5B-LF

Olimex

USB-UART1 MISB-SWMM-5B-LF(USB_MICRO)

TFC-WXCP11-08-LF

Olimex

MICRO_SD1 TFC-WXCP11-08-LF

YDJ-1134

Olimex

PWR1 PWRJ-2mm(YDJ-1134)

BH10S

Generic

UEXT1 BH10S

DW02R

Generic

BAT1 DW02R