Espressif Systems ESP32-WROOM-32D, ESP32-WROOM-32U Service Manual

ESP32-WROOM-32D & ESP32-WROOM-32U

Datasheet

www.espressif.com

Version 1.8

Espressif Systems

About This Document

This document provides the specifications for the ESP32-WROOM-32D and ESP32-WROOM-32U modules.

Revision History

For revision history of this document, please refer to the last page.

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Disclaimer and Copyright Notice

Information in this document, including URL references, is subject to change without notice. THIS DOCUMENT IS

PROVIDED AS IS WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABIL-

ITY, NON-INFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE

ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE.

All liability, including liability for infringement of any proprietary rights, relating to use of information in this docu-

ment is disclaimed. No licenses express or implied, by estoppel or otherwise, to any intellectual property rights

are granted herein. The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a

registered trademark of Bluetooth SIG.

All trade names, trademarks and registered trademarks mentioned in this document are property of their respective

owners, and are hereby acknowledged.

Contents

1 Overview 1

2 Pin Definitions 3

2.1 Pin Layout 3

2.2 Pin Description 3

2.3 Strapping Pins 5

3 Functional Description 6

3.1 CPU and Internal Memory 6

3.2 External Flash and SRAM 6

3.3 Crystal Oscillators 6

3.4 RTC and Low-Power Management 7

4 Peripherals and Sensors 8

5 Electrical Characteristics 9

5.1 Absolute Maximum Ratings 9

5.2 Recommended Operating Conditions 9

5.3 DC Characteristics (3.3 V, 25 °C) 9

5.4 Wi-Fi Radio 10

5.5 BLE Radio 11

5.5.1 Receiver 11

5.5.2 Transmitter 11

5.6 Reflow Profile 12

6 Schematics 13

7 Peripheral Schematics 15

8 Physical Dimensions 17

9 Recommended PCB Land Pattern 19

10U.FL Connector Dimensions 20

11Learning Resources 21

11.1 Must-Read Documents 21

11.2 Must-Have Resources 21

Revision History 22

List of Tables

1 ESP32-WROOM-32D vs. ESP32-WROOM-32U 1

2 ESP32-WROOM-32D and ESP32-WROOM-32U Specifications 2

3 Pin Definitions 3

4 Strapping Pins 5

5 Absolute Maximum Ratings 9

6 Recommended Operating Conditions 9

7 DC Characteristics (3.3 V, 25 °C) 9

8 Wi-Fi Radio Characteristics 10

9 Receiver Characteristics – BLE 11

10 Transmitter Characteristics – BLE 11

List of Figures

1 ESP32-WROOM-32D Pin Layout (Top View) 3

2 Reflow Profile 12

3 ESP32-WROOM-32D Schematics 13

4 ESP32-WROOM-32U Schematics 14

5 ESP32-WROOM-32D & ESP32-WROOM-32U Peripheral Schematics 15

6 Physical Dimensions of ESP32-WROOM-32D 17

7 Physical Dimensions of ESP32-WROOM-32U 18

8 Recommended PCB Land Pattern of ESP32-WROOM-32D 19

9 Recommended PCB Land Pattern of ESP32-WROOM-32U 19

10 ESP32-WROOM-32U U.FL Dimensions 20

1. Overview

ESP32-WROOM-32D and ESP32-WROOM-32U are powerful, generic Wi-Fi+BT+BLE MCU modules that target

a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as

voice encoding, music streaming and MP3 decoding.

ESP32-WROOM-32U is different from ESP32-WROOM-32D in that ESP32-WROOM-32U integrates a U.FL con-

nector. For detailed information of the U.FL connector please see Chapter 10. Note that the information in this

data sheet is applicable to both modules. Any differences between them will be clearly specified in the course of

this document. Table 1 lists the difference between ESP32-WROOM-32D and ESP32-WROOM-32U.

Table 1: ESP32-WROOM-32D vs. ESP32-WROOM-32U

Module ESP32-WROOM-32D ESP32-WROOM-32U

Core ESP32-D0WD ESP32-D0WD

SPI flash 32 Mbits, 3.3 V 32 Mbits, 3.3 V

Crystal 40 MHz 40 MHz

Antenna onboard antenna

Dimensions

(Unit: mm)

Schematics See Figure 3 for details. See Figure 4 for details.

(18.00±0.10) × (25.50±0.10) × (3.10±0.10)

(See Figure 6 for details)

U.FL connector (which needs to be connected

to an external IPEX antenna)

(18.00±0.10) × (19.20±0.10) × (3.20±0.10)

(See Figure 7 for details)

At the core of the two modules is the ESP32-D0WD chip that belongs to the ESP32 series* of chips. The chip

embedded is designed to be scalable and adaptive. There are two CPU cores that can be individually controlled,

and the CPU clock frequency is adjustable from 80 MHz to 240 MHz. The user may also power off the CPU

and make use of the low-power co-processor to constantly monitor the peripherals for changes or crossing of

thresholds. ESP32 integrates a rich set of peripherals, ranging from capacitive touch sensors, Hall sensors, SD

card interface, Ethernet, high-speed SPI, UART, I²S and I²C.

Note:

* For details on the part numbers of the ESP32 family of chips, please refer to the document ESP32 Datasheet.

The integration of Bluetooth, Bluetooth LE and Wi-Fi ensures that a wide range of applications can be targeted,

and that the module is all-around: using Wi-Fi allows a large physical range and direct connection to the Internet

through a Wi-Fi router, while using Bluetooth allows the user to conveniently connect to the phone or broadcast

low energy beacons for its detection. The sleep current of the ESP32 chip is less than 5 µA, making it suitable

for battery powered and wearable electronics applications. The module supports a data rate of up to 150 Mbps,

and 20 dBm output power at the antenna to ensure the widest physical range. As such the module does offer

industry-leading specifications and the best performance for electronic integration, range, power consumption,

and connectivity.

The operating system chosen for ESP32 is freeRTOS with LwIP; TLS 1.2 with hardware acceleration is built in as

well. Secure (encrypted) over the air (OTA) upgrade is also supported, so that users can upgrade their products

even after their release, at minimum cost and effort.

Table 2 provides the specifications of ESP32-WROOM-32D and ESP32-WROOM-32U.

Espressif Systems 1 ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet V1.8

1. Overview

Table 2: ESP32-WROOM-32D and ESP32-WROOM-32U Specifications

Categories Items Specifications

RF Certification FCC/CE-RED/IC/TELEC/KCC/SRRC/NCC

Certification

Wi-Fi Certification Wi-Fi Alliance

Bluetooth certification BQB

Green Certification REACH/RoHS

Test Reliablity HTOL/HTSL/uHAST/TCT/ESD

802.11 b/g/n (802.11n up to 150 Mbps)

Wi-Fi

Protocols

A-MPDU and A-MSDU aggregation and 0.4 µs guard

interval support

Frequency range 2.4 GHz ~ 2.5 GHz

Protocols Bluetooth v4.2 BR/EDR and BLE specification

NZIF receiver with –97 dBm sensitivity

Bluetooth

Radio

Class-1, class-2 and class-3 transmitter

AFH

Audio CVSD and SBC

SD card, UART, SPI, SDIO, I2C, LED PWM, Motor

Module interfaces

PWM, I2S, IR, pulse counter, GPIO, capacitive touch

sensor, ADC, DAC

On-chip sensor Hall sensor

Integrated crystal 40 MHz crystal

Hardware

Integrated SPI flash

4 MB

Operating voltage/Power supply 2.7 V ~ 3.6 V

Operating current Average: 80 mA

Minimum current delivered by power

supply

Recommended operating temperature

range

500 mA

–40 °C ~ +85 °C

Notice:

1. ESP32-WROOM-32D and ESP32-WROOM-32U with 8 MB flash or 16 MB flash are available for custom order.

2. ESP32-WROOM-32D and ESP32-WROOM-32U with high temperature range (–40 °C ~ +105 °C) option are avail-

able for custom order. 4 MB SPI flash is supported on the high temperature range version.

3. For detailed ordering information, please see Espressif Product Ordering Information.

Espressif Systems 2 ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet V1.8

2. Pin Deﬁnitions

Keepout Zone

GND

IO23

IO22

TXD0

RXD0

IO21

IO19

IO18

IO5

IO17

IO16

IO4

IO0

IO2

IO15

SD1

SD0

CLK

CMD

SD3

SD2

IO13

GND

3V3

SENSOR_VP

SENSOR_VN

IO34

IO35

IO32

IO33

IO25

IO26

IO27

IO14

IO12

39 GND

2. Pin Definitions

2.1 Pin Layout

Figure 1: ESP32-WROOM-32D Pin Layout (Top View)

Note:

The pin layout of ESP32-WROOM-32U is the same as that of ESP32-WROOM-32D, except that ESP32-WROOM-32U

has no keepout zone.

2.2 Pin Description

The ESP32-WROOM-32D and ESP32-WROOM-32U have 38 pins. See pin definitions in Table 3.

Name No. Type Function

GND 1 P Ground

3V3 2 P Power supply

EN 3 I Module-enable signal. Active high.

SENSOR_VP 4 I GPIO36, ADC1_CH0, RTC_GPIO0

SENSOR_VN 5 I GPIO39, ADC1_CH3, RTC_GPIO3

IO34 6 I GPIO34, ADC1_CH6, RTC_GPIO4

IO35 7 I GPIO35, ADC1_CH7, RTC_GPIO5

Table 3: Pin Definitions

Espressif Systems 3 ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet V1.8

2. Pin Deﬁnitions

Name No. Type Function

IO32 8 I/O

IO33 9 I/O

GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4,

TOUCH9, RTC_GPIO9

GPIO33, XTAL_32K_N (32.768 kHz crystal oscillator output), ADC1_CH5,

TOUCH8, RTC_GPIO8

IO25 10 I/O GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0

IO26 11 I/O GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1

IO27 12 I/O GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17, EMAC_RX_DV

IO14 13 I/O

IO12 14 I/O

GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK, HS2_CLK,

SD_CLK, EMAC_TXD2

GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ, HS2_DATA2,

SD_DATA2, EMAC_TXD3

GND 15 P Ground

IO13 16 I/O

GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID, HS2_DATA3,

SD_DATA3, EMAC_RX_ER

SHD/SD2* 17 I/O GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD

SWP/SD3* 18 I/O GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD

SCS/CMD* 19 I/O GPIO11, SD_CMD, SPICS0, HS1_CMD, U1RTS

SCK/CLK* 20 I/O GPIO6, SD_CLK, SPICLK, HS1_CLK, U1CTS

SDO/SD0* 21 I/O GPIO7, SD_DATA0, SPIQ, HS1_DATA0, U2RTS

SDI/SD1* 22 I/O GPIO8, SD_DATA1, SPID, HS1_DATA1, U2CTS

IO15 23 I/O

IO2 24 I/O

GPIO15, ADC2_CH3, TOUCH3, MTDO, HSPICS0, RTC_GPIO13, HS2_CMD,

SD_CMD, EMAC_RXD3

GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0,

SD_DATA0

IO0 25 I/O GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1, EMAC_TX_CLK

IO4 26 I/O

GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1,

SD_DATA1, EMAC_TX_ER

IO16 27 I/O GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_OUT

IO17 28 I/O GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_OUT_180

IO5 29 I/O GPIO5, VSPICS0, HS1_DATA6, EMAC_RX_CLK

IO18 30 I/O GPIO18, VSPICLK, HS1_DATA7

IO19 31 I/O GPIO19, VSPIQ, U0CTS, EMAC_TXD0

NC 32 - -

IO21 33 I/O GPIO21, VSPIHD, EMAC_TX_EN

RXD0 34 I/O GPIO3, U0RXD, CLK_OUT2

TXD0 35 I/O GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2

IO22 36 I/O GPIO22, VSPIWP, U0RTS, EMAC_TXD1

IO23 37 I/O GPIO23, VSPID, HS1_STROBE

GND 38 P Ground

Notice:

* Pins SCK/CLK, SDO/SD0, SDI/SD1, SHD/SD2, SWP/SD3 and SCS/CMD, namely, GPIO6 to GPIO11 are connected

to the integrated SPI flash integrated on the module and are not recommended for other uses.

Espressif Systems 4 ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet V1.8

+ 18 hidden pages

Espressif Systems ESP32-WROOM-32D, ESP32-WROOM-32U Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. Overview

2. Pin Definitions

2.1 Pin Layout

2.2 Pin Description