ESPRESSIF SYSTEMS ESPWROOM02DC User Manual
ESP-WROOM-02DC
Datasheet
www.espressif.com
Version 0.1
Espressif Systems
Copyright © 2018
About This Guide
This document provides introduction to the specifications of ESP-WROOM-02DC
hardware.
Release Notes
Documentation Change Notification
Espressif provides email notifications to keep customers updated on changes to
technical documentation. Please subscribe at https://www.espressif.com/en/subscribe.
Certification
Download certificates for Espressif products from https://www.espressif.com/en/
certificates.
Date
Version
Release notes
2018.10
V0.1
For certification only.
Table of Contents
1. Overview 1................................................................................................................................
2. Pin Description 2......................................................................................................................
3. Functional Description 4..........................................................................................................
3.1. CPU! 4"..........................................................................................................................................
3.2. Memory! 4"....................................................................................................................................
3.2.1. Internal SRAM and ROM! 4"...........................................................................................
3.2.2. SPI Flash! 4"....................................................................................................................
3.3. Crystal Oscillator! 5"......................................................................................................................
3.4. Interface Description! 5"................................................................................................................
4. Electrical Characteristics 7......................................................................................................
4.1. Electrical Characteristics! 7"..........................................................................................................
4.2. Wi-Fi Radio! 7"...............................................................................................................................
4.3. Power Consumption! 8".................................................................................................................
4.4. Reflow Profile! 9"...........................................................................................................................
4.5. Electrostatic Discharge! 10"..........................................................................................................
6. Dimensions ..........................................................................................................................11
7. Recommended PCB Land Pattern .....................................................................................1
A. Appendix—Learning Resources .........................................................................................13
A.1. Must-Read Documents
Must-Have Resources! ............................................................................................................14
A.2.
! ..........................................................................................................1
2
3!
CONFIDENTIAL
!
1. Overview
1. Overview
ESP-WROOM-02DC is ESP8266EX-based module developed by Espressif. Compared to
ESP-WROOM-02D, a two-layer PCB design is applied for ESP-WROOM-02DC.
📖 Note:
For more information on ESP8266EX, please refer to ESP8266EX Datasheet.
Table 1-2. ESP-WROOM-02DC Specifications
Categories
Items
Specifications
Wi-Fi
Wi-Fi protocols
Frequency range
Hardware
Peripheral interface
UART/HSPI/I2C/I2S/IR Remote Control
GPIO/PWM
Operating voltage
2.7V ~ 3.6V
Operating current
Average: 80 mA
Minimum current delivered by
power supply
500 mA
Operating temperature range
-40°C ~ 85°C
External interface
-
Software
Wi-Fi mode
Station/SoftAP/SoftAP + Station
Security
WPA/WPA2
Encryption
WEP/TKIP/AES
Firmware upgrade
UART Download/OTA (via network)/Download and write
firmware via host
Software development
Supports Cloud Server Development/SDK for custom
firmware development
Network protocols
IPv4, TCP/UDP/HTTP/FTP
User configuration
AT Instruction Set, Cloud Server, Android/iOS app
Espressif
2018.10
802.11 b/g/n20
2.4 GHz ~ 2.5 GHz (2412MHz ~ 2462MHz)
!1/!14
CONFIDENTIAL
!
2. Pin Description
2. Pin Description
Figure 2-1 shows the pin distribution of the ESP-WROOM-02DC.
!
Figure 2-1. ESP-WROOM-02DC Pin Layout (Top View)
ESP-WROOM-02DC has 18 pins. Please see the pin definitions in Table 2-1.
19GND
PCB ANTENNA
GND
IO16
TOUT
RST
IO5
GND
TXD
RXD
IO4
3V3
EN
IO14
IO12
IO13
IO15
IO2
IO0
GND
9
8
7
6
5
4
3
2
1
10
11
12
13
14
15
16
17
18
Table 2-1. ESP-WROOM-02DC Pin Definitions
No.
Pin Name
Functional Description
1
3V3
3.3V power supply (VDD)
📖 Note:
It is recommended the maximum output current a power supply
provides be of 500 mA or above.
2ENChip enable pin. Active high.
3
IO14
GPIO14; HSPI_CLK
4
IO12
GPIO12; HSPI_MISO
5
IO13
GPIO13; HSPI_MOSI; UART0_CTS
6
IO15
GPIO15; MTDO; HSPICS; UART0_RTS
Pull down.
Espressif
2018.10
!2/!14
CONFIDENTIAL
!
2. Pin Description
7
IO2
GPIO2; UART1_TXD
Floating (internal pull-up) or pull up.
8
IO0
GPIO0
•
UART download: pull down.
•
Flash boot: floating or pull up.
9
GND
GND
10
IO4
GPIO4
11
RXD
UART0_RXD, receive end in UART download;
GPIO3
12
TXD
UART0_TXD, transmit end in UART download, floating or pull up;
GPIO1
13
GND
GND
14
IO5
GPIO5
15
RST
Reset
16
TOUT
It can be used to test the power-supply voltage of VDD3P3 (Pin3 and
Pin4) and the input power voltage of TOUT (Pin6). These two functions
cannot be used simultaneously.
17
IO16
GPIO16; used for Deep-sleep wake-up when connected to RST pin.
18
GND
GND
No.
Pin Name
Functional Description
Espressif
2018.10
!3/!14
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