ESPRESSIF SYSTEMS ESPWROOM32DC User Manual

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ESP32-WROOM-32DC

Datasheet

Prerelease version 0.1

Espressif Systems

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About This Document

This document provides the specifications for the ESP32-WROOM-32DC module.

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

MERCHANTABILITY, 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

document 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.

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Contents

1 Overview 1

2 Pin Definitions 3

2.1 Pin Layout 3

2.2 Pin Description 3

2.3 Strapping Pins 4

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

5.1 Absolute Maximum Ratings

5.2 Recommended Operating Conditions

5.3 DC Characteristics (3.3 V, 25 °C)

5.4 Reflow Profile

6 Physical Dimensions

7 Recommended PCB Land Pattern

8 Learning Resources

8.1 Must-Read Documents

8.2 Must-Have Resources

Revision History

List of Tables

1 ESP32-WROOM-32DC Specifications

2 Pin Definitions

3 Strapping Pins

4 Absolute Maximum Ratings

5 Recommended Operating Conditions

6 DC Characteristics (3.3 V, 25 °C)

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List of Figures

1 ESP32-WROOM-32DC Pin Layout (Top View)

2 Reflow Profile

3 Physical Dimensions of ESP32-WROOM-32DC

4 Recommended PCB Land Pattern

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1. Overview

ESP32-WROOM-32DC is a powerful, generic Wi-Fi+BT+BLE MCU module that targets 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.

At the core of this module is the ESP32-D0WD chip*. 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 developers can upgrade their

products even after their release, at minimum cost and effort.

Table 1 provides the specifications of ESP32-WROOM-32DC.

Table 1: ESP32-WROOM-32DC Specifications

Categories Items Specifications

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

Wi-Fi

Bluetooth

Protocols

Frequency range 2.4 GHz ~ 2.5 GHz

Protocols Bluetooth v4.2 BR/EDR and BLE specification

Radio

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Audio CVSD and SBC

Hardware Module interface

On-chip sensor Hall sensor

On-board clock 40 MHz crystal

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

interval support

NZIF receiver with –97 dBm sensitivity

AFH

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

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

sensor, ADC, DAC

Espressif Systems 1 ESP32-WROOM-32DC Datasheet V0.1

1. Overview

Categories Items Specifications

Operating voltage/Power supply 2.7 V ~ 3.6 V

Operating current Average: 80 mA

Minimum current delivered by

power supply

Recommended operating tem-

perature range

Package size (mm) (18.00±0.10) × (25.50±0.10) × (3.10±0.10)

500 mA

–40 °C ~ +85 °C

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Espressif Systems 2 ESP32-WROOM-32DC Datasheet V0.1

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-32DC Pin Layout (Top View)

2.2 Pin Description

ESP32-WROOM-32DC has 38 pins. See pin definitions in Table 2.

Table 2: Pin Definitions

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

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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

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

Espressif Systems 3 ESP32-WROOM-32DC Datasheet V0.1

2. Pin Deﬁnitions

Name No. Type Function

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

GND 15 P Ground

IO13 16 I/O

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

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

IO4 26 I/O

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

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

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

SD_DATA3, EMAC_RX_ER

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

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

SD_DATA1, EMAC_TX_ER

Notice:

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* 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.

2.3 Strapping Pins

ESP32 has five strapping pins, which can be seen in Chapter 6 Schematics:

Espressif Systems 4 ESP32-WROOM-32DC Datasheet V0.1

2. Pin Deﬁnitions

• MTDI

• GPIO0

• GPIO2

• MTDO

• GPIO5

Software can read the values of these five bits from register ”GPIO_STRAPPING”.

During the chip’s system reset (power-on-reset, RTC watchdog reset and brownout reset), the latches of the

strapping pins sample the voltage level as strapping bits of ”0” or ”1”, and hold these bits until the chip is

powered down or shut down. The strapping bits configure the device’s boot mode, the operating voltage of

VDD_SDIO and other initial system settings.

Each strapping pin is connected to its internal pull-up/pull-down during the chip reset. Consequently, if a

strapping pin is unconnected or the connected external circuit is high-impedance, the internal weak

pull-up/pull-down will determine the default input level of the strapping pins.

To change the strapping bit values, users can apply the external pull-down/pull-up resistances, or use the host

MCU’s GPIOs to control the voltage level of these pins when powering on ESP32.

After reset, the strapping pins work as normal-function pins.

Refer to Table 3 for a detailed boot-mode configuration by strapping pins.

Table 3: Strapping Pins

Voltage of Internal LDO (VDD_SDIO)

Pin Default 3.3 V 1.8 V

MTDI Pull-down 0 1

Booting Mode

Pin Default SPI Boot Download Boot

GPIO0 Pull-up 1 0

GPIO2 Pull-down Don’t-care 0

Enabling/Disabling Debugging Log Print over U0TXD During Booting

Pin Default U0TXD Active U0TXD Silent

MTDO Pull-up 1 0

Timing of SDIO Slave

Pin Default

MTDO Pull-up 0 0 1 1

GPIO5 Pull-up 0 1 0 1

Falling-edge Input

Falling-edge Output

Falling-edge Input

Rising-edge Output

Rising-edge Input

Falling-edge Output

Rising-edge Input

Rising-edge Output

Note:

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• Firmware can configure register bits to change the settings of ”Voltage of Internal LDO (VDD_SDIO)” and ”Timing

of SDIO Slave” after booting.

• The module integrates a 3.3 V SPI flash, so the pin MTDI cannot be set to 1 when the module is powered up.

Espressif Systems 5 ESP32-WROOM-32DC Datasheet V0.1

3. Functional Description

This chapter describes the modules and functions integrated in ESP32-WROOM-32DC.

3.1 CPU and Internal Memory

ESP32-D0WD contains two low-power Xtensa®32-bit LX6 microprocessors. The internal memory

includes:

• 448 KB of ROM for booting and core functions.

• 520 KB of on-chip SRAM for data and instructions.

• 8 KB of SRAM in RTC, which is called RTC FAST Memory and can be used for data storage; it is accessed

by the main CPU during RTC Boot from the Deep-sleep mode.

• 8 KB of SRAM in RTC, which is called RTC SLOW Memory and can be accessed by the co-processor

during the Deep-sleep mode.

• 1 Kbit of eFuse: 256 bits are used for the system (MAC address and chip configuration) and the remaining

768 bits are reserved for customer applications, including flash-encryption and chip-ID.

3.2 External Flash and SRAM

ESP32 supports multiple external QSPI flash and SRAM chips. More details can be found in Chapter SPI in

the

ESP32 Technical Reference Manual. ESP32 also supports hardware encryption/decryption based on AES to

protect developers’ programs and data in flash.

ESP32 can access the external QSPI flash and SRAM through high-speed caches.

• The external flash can be mapped into CPU instruction memory space and read-only memory space

simultaneously.

– When external flash is mapped into CPU instruction memory space, up to 11 MB + 248 KB can be

mapped at a time. Note that if more than 3 MB + 248 KB are mapped, cache performance will be

reduced due to speculative reads by the CPU.

– When external flash is mapped into read-only data memory space, up to 4 MB can be mapped at a

time. 8-bit, 16-bit and 32-bit reads are supported.

• External SRAM can be mapped into CPU data memory space. Up to 4 MB can be mapped at a time.

8-bit, 16-bit and 32-bit reads and writes are supported.

ESP32-WROOM-32DC integrates 4 MB of external SPI flash. The 4-MB SPI flash can be memory-mapped onto

the CPU code space, supporting 8, 16 and 32-bit access. Code execution is supported. The integrated SPI

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flash is connected to GPIO6, GPIO7, GPIO8, GPIO9, GPIO10 and GPIO11. These six pins cannot be used as

regular GPIOs.

3.3 Crystal Oscillators

The module uses a 40-MHz crystal oscillator.

Espressif Systems 6 ESP32-WROOM-32DC Datasheet V0.1

3. Functional Description

3.4 RTC and Low-Power Management

With the use of advanced power-management technologies, ESP32 can switch between different power

modes.

For details on ESP32’s power consumption in different power modes, please refer to section ”RTC and

Low-Power Management” in ESP32 Datasheet.

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Espressif Systems 7 ESP32-WROOM-32DC Datasheet V0.1

4. Peripherals and Sensors

Please refer to Section Peripherals and Sensors in ESP32 Datasheet.

Note:

External connections can be made to any GPIO except for GPIOs in the range 6-11. These six GPIOs are connected to

the module’s integrated SPI flash. For details, please see Section 6 Schematics.

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Espressif Systems 8 ESP32-WROOM-32DC Datasheet V0.1

5. Electrical Characteristics

5.1 Absolute Maximum Ratings

Stresses beyond the absolute maximum ratings listed in the table below may cause permanent damage to the

device. These are stress ratings only, and do not refer to the functional operation of the device.

Table 4: Absolute Maximum Ratings

Symbol Parameter Min Max Unit

VDD33 Power supply voltage –0.3 3.6 V

store

1. The module worked properly after a 24-hour test in ambient temperature at 25 °C, and the IOs in three domains (VDD3P3_RTC, VDD3P3_CPU, VDD_SDIO) output high logic level to ground. Please note that pins occupied by flash and/or PSRAM in the VDD_SDIO power domain were excluded from the test.

2. Please see Appendix IO_MUX of ESP32 Datasheet for IO’s power domain.

Storage temperature –40 150 °C

Cumulative IO output current - 1,100 mA

5.2 Recommended Operating Conditions

Table 5: Recommended Operating Conditions

Symbol Parameter Min Typical Max Unit

VDD33 Power supply voltage 2.7 3.3 3.6 V

V DD

T Operating temperature –40 - 85 °C

Current delivered by external power supply 0.5 - - A

5.3 DC Characteristics (3.3 V, 25 °C)

Table 6: DC Characteristics (3.3 V, 25 °C)

Symbol Parameter Min Typ Max Unit

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High-level source current VDD3P3_CPU power domain

P U

(VDD1= 3.3 V, VOH>= 2.64 V, VDD3P3_RTC power domain

PAD_DRIVER = 3) VDD_SDIO power domain

Low-level sink current

(VDD1= 3.3 V, VOL= 0.495 V, PAD_DRIVER = 3)

Pin capacitance - 2 - pF

High-level input voltage 0.75×VDD1- VDD1+0.3 V

Low-level input voltage –0.3 - 0.25×VDD1V

High-level input current - - 50 nA

Low-level input current - - 50 nA

High-level output voltage 0.8×VDD1- - V

Low-level output voltage - - 0.1×VDD1V

1, 2

- 40 - mA

1, 2

- 40 - mA

1, 3

Pull-up resistor - 45 - kΩ

- 20 - mA

- 28 - mA

Espressif Systems 9 ESP32-WROOM-32DC Datasheet V0.1

5. Electrical Characteristics

Symbol Parameter Min Typ Max Unit

P D

IL_nRS T

Notes:

1. Please see Appendix IO_MUX of ESP32 Datasheet for IO’s power domain. VDD is the I/O voltage for a particular power domain of pins.

2. For VDD3P3_CPU and VDD3P3_RTC power domain, per-pin current sourced in the same domain is gradually reduced from around 40 mA to around 29 mA, VOH>=2.64 V, as the number of current-source pins increases.

3. Pins occupied by flash and/or PSRAM in the VDD_SDIO power domain were excluded from the test.

Low-level input voltage of CHIP_PU to reset the chip - - 0.6 V

Pull-down resistor - 45 - kΩ

Espressif Systems 10 ESP32-WROOM-32DC Datasheet V0.1

5. Electrical Characteristics

150

1 ~ 3℃/s

200

250

200

-1 ~ -5℃/s

Cooling zone

100

217

100 250

Reﬂow zone

!217℃ 60 ~ 90s

Temperature (℃)

Preheating zone

150 ~ 200℃ 60 ~ 120s

Ramp-up zone

Peak Temp.

235 ~ 250℃

Soldering time

> 30s

Time (sec.)

Ramp-up zone — Temp.: <150℃ Time: 60 ~ 90s Ramp-up rate: 1 ~ 3℃/s Preheating zone — Temp.: 150 ~ 200℃ Time: 60 ~ 120s Ramp-up rate: 0.3 ~ 0.8℃/s Reﬂow zone — Temp.: >217℃ 7LPH60 ~ 90s; Peak Temp.: 235 ~ 250℃ (<245℃ recommended) Time: 30 ~ 70s

Cooling zone — Peak Temp. ~ 180℃ Ramp-down rate: -1 ~ -5℃/s Solder — Sn&Ag&Cu Lead-free solder (SAC305)

5.4 Reflow Profile

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Figure 2: Reflow Profile

Espressif Systems 11 ESP32-WROOM-32DC Datasheet V0.1

PCB Thickness

Module Thickness

3.10±0.10

0.80±0.10

1.27±0.10

1.50±0.10

17.60±0.10

Module Width

Module Length

1.27±0.10

11.43±0.10

25.50±0.10

18.00±0.10

Unit: mm

16.51±0.10

11.43±0.10

3.28±0.10

1.27±0.10

25.50±0.10

ESP32-WROOM-32DC DIMENSIONS

Top View

Side View

Bottom View

Antenna Area

0.90±0.10

0.85±0.10

6.20±0.10

15.80±0.10

1.50±0.10

0.45±0.10

0.90±0.10

18.00±0.10

3.28±0.10

∅0.50±0.10

6.40±0.10

9.20±0.10

2.20±0.10

Espressif Systems 12 ESP32-WROOM-32DC Datasheet V0.1

Physical Dimensions

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Physical Dimensions

Figure 3: Physical Dimensions of ESP32-WROOM-32DC

Recommended PCB Land Pattern

25.5

1.27x13=16.51

1.27x9=11.432.785

6.3

7.49

2.785

0.9

15 24

Unit:mm

6.51

Recommended PCB Land Pattern

Figure4: Recommended PCB Land Pattern

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Espressif Systems 13 ESP32-WROOM-32DC Datasheet V0.1

Learning Resources

8.1 Must-Read Documents

The following link provides documents related to ESP32.

• ESP32 Datasheet

This document provides an introduction to the specifications of the ESP32 hardware, including overview,

pin definitions, functional description, peripheral interface, electrical characteristics, etc.

• ESP-IDF Programming Guide

It hosts extensive documentation for ESP-IDF ranging from hardware guides to API reference.

• ESP32 Technical Reference Manual

The manual provides detailed information on how to use the ESP32 memory and peripherals.

• ESP32 Hardware Resources

The zip files include the schematics, PCB layout, Gerber and BOM list of ESP32 modules and development

boards.

• ESP32 Hardware Design Guidelines

The guidelines outline recommended design practices when developing standalone or add-on systems

based on the ESP32 series of products, including the ESP32 chip, the ESP32 modules and development

boards.

• ESP32 AT Instruction Set and Examples

This document introduces the ESP32 AT commands, explains how to use them, and provides examples of

several common AT commands.

• Espressif Products Ordering Information

8.2 Must-Have Resources Here

are the ESP32-related must-have resources.

• ESP32 BBS

This is an Engineer-to-Engineer (E2E) Community for ESP32 where you can post questions, share

knowledge, explore ideas, and help solve problems with fellow engineers.

• ESP32 GitHub

ESP32 development projects are freely distributed under Espressif’s MIT license on GitHub. It is

established to help developers get started with ESP32 and foster innovation and the growth of general

knowledge about the hardware and software surrounding ESP32 devices.

• ESP32 Tools

This is a webpage where users can download ESP32 Flash Download Tools and the zip file ”ESP32

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Certification and Test”.

• ESP-IDF

This webpage links users to the official IoT development framework for ESP32.

• ESP32 Resources

This webpage provides the links to all available ESP32 documents, SDK and tools. ��

Espressif Systems 14 ESP32-WROOM-32DC Datasheet V0.1

Revision History

Date Version Release notes

2018.10 V0.1 Preliminary release.

FCC Statement Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment .This equipment should be installed and operated with minimum distance 20cm between the radiator& your body. FCC Label Instructions: The outside of final products that contains this module device must display a label referring to the enclosed module. This exterior label can use wording such as: “Contains Transmitter Module FCC ID: 2AC7Z-ESPWROOM32DC”,or “Contains FCC ID: 2AC7Z-ESPWROOM32DC”, Any similar wording that expresses the same meaning may be used.

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Espressif Systems 15 ESP32-WROOM-32DC Datasheet V0.1

ESPRESSIF SYSTEMS ESPWROOM32DC User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual