ESPRESSIF SYSTEMS ESPWROOM32 Users manual

ESP-WROOM-32 Datasheet

Espressif Systems

September 26, 2016

About This Guide

This document lists the specifications for the ESP-WROOM-32 module.

The document structure is as follows:

Chapter Title Subject

Chapter 1 Preface A preview of ESP-WROOM-32

Chapter 2 Pin Definitions Device pinout and pin descriptions

Chapter 3 Functional Description Description of major functional modules and protocols

Chapter 4 Electrical Characteristics Electrical characteristics and specifications for ESP-WROOM-32

Chapter 5 Schematics The schematics of ESP-WROOM-32

Release Notes

Date Version Release notes

2016.08 V1.0 First release

2016.09 V1.1 Updated Chapter 5: Schematics

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.

Copyright © 2016 Espressif Inc. All rights reserved.

Contents

1 Preface 1

2 Pin Definitions 3

2.1 Pin Layout 3

2.2 Pin Description 4

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 Power Consumption 7

3.5 Peripheral Interface Description 8

4 Electrical Characteristics 13

4.1 Absolute Maximum Ratings 13

4.2 Recommended Operating Conditions 13

4.3 Digital Terminal Characteristics 13

4.4 Wi-Fi Radio 14

4.5 Bluetooth LE Radio 14

4.5.1 Receiver 14

4.5.2 Transmit 15

4.6 Reflow Profile 15

5 Schematics 16

List of Tables

1 ESP-WROOM-32 Specifications 2

2 ESP-WROOM-32 Dimensions 3

3 ESP-WROOM-32 Pin Definitions 4

4 Strapping Pins 5

5 Power Consumption by Power Modes 7

6 Interface Description 8

7 Absolute Maximum Ratings 13

8 Recommended Operating Conditions 13

9 Digital Terminal Characteristics 13

10 Wi-Fi Radio Characteristics 14

11 Receiver Characteristics - BLE 14

12 Transmit Characteristics - BLE 15

13 Reflow Profile 15

List of Figures

1 Top and Side View of ESP-WROOM-32 3

2 ESP-WROOM-32 Schematics 16

FCC Caution:

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.
To satisfy FCC RF Exposure requirements for this transmission devices, a
separation distance of 20cm or more should be maintained between the
antenna of this device and persons during operation. To ensure compliance,
operation at closer than this distance is not recommended. The antenna(s)
used for this transmitter must not be co-located or operating in conjunction
with any other antenna or transmitter. Changes or modifications not
expressly approved by the party responsible for compliance could void the
user's authority to operate the equipment.
The modular transmitter must be equipped with either a permanently affixed
label or must be capable of electronically displaying its FCC identification
number：
(A) If using a permanently affixed label, the modular transmitter must be
labeled with its own FCC identification number, and, if the FCC
identification number is not visible when the module is installed inside
another device, then the outside of the device into which the module is
installed must also display a label referring to the enclosed module. This
exterior label can use wording such as the following: “Contains Transmitter
Module FCC ID:2AC7Z-ESPWROOM32.” Any similar wording that
expresses the same meaning may be used. The Grantee may either provide
such a label, an example of which must be included in the application for
equipment authorization, or, must provide adequate instructions along with
the module which explain this requirement. In the latter case, a copy of these
instructions must be included in the application for equipment
authorization.

1 PREFACE

1. Preface

ESP-WROOM-32 is a powerful, generic WiFi-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 chip, which is designed to be scalable and adaptive. There are 2 CPU cores

that can be individually controlled or powered, and the 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 coprocessor 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, low noise sense amplifiers, SD card interface, Ethernet, high speed SDIO/SPI, UART, I2S

and I2C.

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

and that it is future proof: 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. ESP-WROOM-32 supports data rates up to 150 Mbps, and 22

dBm output power at the PA to ensure the widest physical range. As such the chip does offer industry leading

specifications and the best optimized performance for electronic integration, range and 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 continually upgrade

their products even after their release. The software releases are covered under the ESP32 bug bounty program

and any bugs can be reported to [e-mail]. As the SDK of ESP-WROOM-32 or ESP32 is open-

source, the user can build his own platforms and operating systems. For more in-depth discussion of this, the

developer can contact [e-mail].

ESP-WROOM-32 has Espressif’s long term support — ESP32 will be covered under Espressif’s longevity program

and be available for the next 12 years. The design of ESP-WROOM-32 will be open-source when it has been fully

optimized. Feedbacks about the module, chip, API or firmware can be sent to [e-mail].

Table 1 provides the specifications of ESP-WROOM-32.

Espressif Systems 1 http://www.espressif.com