ESPRESSIF SYSTEMS ESPWROOM02UC User Manual

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ESP-WROOM-02UC

Datasheet

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Version 0.1

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essif Systems

About This Guide

This document provides introduction to the speciﬁcations of ESP-WROOM-02UC 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 3......................................................................................................................

3. Functional Description 5..........................................................................................................

3.1. CPU! 5"..........................................................................................................................................

3.2. Memory! 5"....................................................................................................................................

3.2.1. Internal SRAM and ROM! 5"...........................................................................................

3.2.2. SPI Flash! 5"....................................................................................................................

3.3. Crystal Oscillator! 6"......................................................................................................................

3.4. Interface Description! 6"................................................................................................................

4. Electrical Characteristics 8......................................................................................................

4.1. Electrical Characteristics! 8"..........................................................................................................

4.2. Wi-Fi Radio! 8"...............................................................................................................................

4.3. Power Consumption! 9".................................................................................................................

4.4. Reﬂow Proﬁle! 10".........................................................................................................................

4.5. Electrostatic Discharge! 11"..........................................................................................................

5. Dimensions ..........................................................................................................................

.12

6. Recommended PCB Land Pattern ......................................................................................13

Appendix—Learning Resources .........................................................................................14

A.1. Must-Read Documents

A.2.

Must-Have Resources" ............................................................................................................15

" ..........................................................................................................

14"

CONFIDENTIAL

1. Overview

ESP-WROOM-02UC is ESP8266EX-based module developed by Espressif. Compared to ESP-WROOM-02U, a two-layer PCB design is applied for ESP-WROOM-02UC.

Table 1-1 provides the speciﬁcations of ESP-WROOM-02UC.

📖 Note:

For more information on ESP8266EX, please refer to ESP8266EX Datasheet.

Table 1-1. ESP-WROOM-02UC Speciﬁcations

3.2. Memory

3.2.1. Internal SRAM and ROM

ESP8266EX Wi-Fi SoC integrates the memory controller and memory units including ROM and SRAM. MCU can access the memory units through iBus, dBus, and AHB interfaces. All memory units can be accessed upon request. A memory arbiter determines the running

sequence in the arrival order of requests.

According to our current version of SDK, the SRAM space available to users is assigned as follows:

• RAM size < 50 kB, that is, when ESP8266EX is working in Station mode and

connects to the router, available space in the Heap + Data sector is around 50 kB.

• There is no programmable ROM in ESP8266EX, therefore, the user program must be

stored in an external SPI ﬂash.

3.2.2. SPI Flash

ESP8266EX supports SPI ﬂash. Theoretically speaking, ESP8266EX can support an upto-16-MB SPI ﬂash.

ESP-WROOM-02UC currently integrates a 2-MB SPI ﬂash and supports these SPI modes: Standard SPI, DIO (Dual I/O), DOUT (Dual Output), QIO (Quad I/O) and QOUT (Quad Output).

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CONFIDENTIAL

3. Functional Description

3.3. Crystal Oscillator

ESP-WROOM-02UC uses a 26-MHz crystal oscillator. The accuracy of the crystal oscillator should be ±10 PPM.

When using the download tool, please select the right type of crystal oscillator. In circuit design, capacitors C1 and C2 which connect to the earth are added to the input and output terminals of the crystal oscillator respectively. The values of the two capacitors can be ﬂexible, ranging from 6 pF to 22 pF, however, the speciﬁc capacitive values depend on

further testing of, and adjustment to, the overall performance of the whole circuit. Normally, the capacitive values of C1 and C2 are within 10 pF for the 26-MHz crystal oscillator.

3.4. Interface Description

Table 3-1. Interface Description

Interface

Functional Description

HSPI

IO12 (MISO), IO13 (MOSI), IO14 (CLK), IO15 (CS)

Connects to SPI Flash, display screen, and MCU.

PWM

IO12 (R), IO15 (G),IO13 (B)

Currently the PWM interface has four channels, but users can extend it to eight channels. PWM interface can realize the control of LED lights, buzzers, relays, electronic machines, etc.

IO14 (IR_T), IO5 (IR_R)

The functionality of the infrared remote control interface can be realized via software programming. The interface uses NEC coding, modulation, and demodulation. The frequency of the modulated carrier signal is 38 kHz.

ADC

TOUT

Tests the power supply voltage of VDD3P3 (Pin3 and Pin4) and the input power voltage of TOUT (Pin6). However, these two functions cannot be used simultaneously. This interface is typically used in sensors.

I2C

IO14 (SCL), IO2 (SDA)

Connects to external sensors and display screens, etc.

UART

UART0: TXD (U0TXD),

RXD (U0RXD), IO15 (RTS), IO13 (CTS)

UART1: IO2 (TXD)

Communicates with the UART device.

Downloading: U0TXD + U0RXD or GPIO2 + U0RXD

Communicating: (UART0): U0TXD, U0RXD, MTDO (U0RTS), MTCK (U0CTS)

Debugging: UART1_TXD (GPIO2) can be used to print debugging information.

By default, UART0 will output some printed information when you power on ESP8266EX. If this issue inﬂuences some speciﬁc applications, users can exchange the inner pins of UART when initializing ESP8266EX, that is, exchange U0TXD and U0RXD with U0RTS and U0CTS. Users can connect MTDO and MTCK to the serial port of the external MCU to realize the communication.

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CONFIDENTIAL

3. Functional Description

I2S

I2S input:

IO12 (I2SI_DATA) ;

IO13 (I2SI_BCK );

IO14 (I2SI_WS);

Collects, processes and transmits audio data.

I2S output:

IO15 (I2SO_BCK );

IO3 (I2SO_DATA);

IO2 (I2SO_WS ).

Interface

Functional Description

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4. Electrical Characteristics

4.1. Electrical Characteristics

4.2. Wi-Fi Radio

📖 Note:

Unless otherwise speciﬁed, measurements are based on VDD = 3.3V, TA = 25°C.

Table 4-1. Electrical Characteristics

Parameter

Symbol

Min

Typ

Max

Unit

Operating temperature

–40

2085℃

Maximum soldering temperature (Condition: IPC/JEDEC J-STD-020)

---

260

℃

Supply voltage

VDD

2.7

3.3

3.6

Input logic level low

VIL–0.3-0.25 VDD

Input logic level high

VIH0.75 VDD

VDD + 0.3

Output logic level low

VOL--0.1 VDD

Output logic level high

VOH0.8 VDD

--V

Table 4-2. Wi-Fi Radio Characteristics

Description

Min

Typ

Max

Unit

Input frequency

2412

MHz

Input reﬂection

-　-–10

Output Impedance

-*-

Output Power

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RF Power

DSSS, 1 Mbps - –98 - dBm

CCK, 11 Mbps - –91 - dBm

18.26

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Sensitivity

2462

- 24.11

dBm

CONFIDENTIAL

4. Electrical Characteristics

4.3. Power Consumption

The following power consumption data were obtained from the tests with a 3.3V power supply and a voltage stabilizer, in 25°C ambient temperature. All data are based on 50% duty cycle in continuous transmission mode.

6 Mbps (1/2 BPSK)

–93-dBm

54 Mbps (3/4 64-QAM)

–75-dBm

HT20, MCS7 (65 Mbps, 72.2 Mbps)

–72-dBm

Adjacent channel rejection

OFDM, 6 Mbps

-37-

OFDM, 54 Mbps

-21-

HT20, MCS0

-37-

HT20, MCS7

-20-

Description

Min

Typ

Max

Unit

📖 Note:

For the module that uses an IPEX antenna, the output impedance is 50Ω.

Table 4-3. Power Consumption

Modes

Min

Typ

Max

Unit

Tx 802.11b, CCK 11 Mbps, POUT = +17 dBm

170-mA

Tx 802.11g, OFDM 54 Mbps, POUT = +15 dBm

140-mA

Tx 802.11n, MCS7, POUT = +13 dBm

120-mA

Rx 802.11b, 1024 bytes packet length , –80 dBm

-50-

Rx 802.11g, 1024 bytes packet length , –70 dBm

-56-

Rx 802.11n, 1024 bytes packet length , –65 dBm

-56-

Modem-sleep①

-15-

Light-sleep②

0.9-mA

Deep-sleep③

-20-

μA

Power Off

0.5-μA

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CONFIDENTIAL

4. Electrical Characteristics

4.4. Reﬂow Proﬁle



Figure 4-1. ESP-WROOM-02UC Reﬂow Proﬁle

📖 Notes:

① Modem-sleep mode is used in the applications that require the CPU to be working, as in PWM or

I2S applications. According to 802.11 standards (like U-APSD), it shuts down the Wi-Fi Modem circuit while maintaining a Wi-Fi connection with no data transmission to optimize power consumption. E.g. in DTIM3, maintaining a sleep of 300 ms with a wakeup of 3 ms cycle to receive AP’s Beacon packages at interval requires about 15 mA current.

② During Light-sleep mode, the CPU may be suspended in applications like Wi-Fi switch. Without

data transmission, the Wi-Fi Modem circuit can be turned off and CPU suspended to save power consumption according to the 802.11 standards (U-APSD). E.g. in DTIM3, maintaining a sleep of 300 ms with a wakeup of 3ms to receive AP’s Beacon packages at interval requires about 0.9 mA current.

③ During Deep-sleep mode, Wi-Fi is turned off. For applications with long time lags between data

transmission, e.g. a temperature sensor that detects the temperature every 100s, sleeps for 300s and wakes up to connect to the AP (taking about 0.3 ~ 1s), the overall average current is less than 1mA. The current of 20 μA is acquired at the voltage of 2.5V.

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℃ T ime: 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)

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CONFIDENTIAL

4. Electrical Characteristics

4.5. Electrostatic Discharge

Table 4-4. Electrostatic Discharge Parameters

Name

Symb ol

Reference

Level

Max

Unit

Electrostatic Discharge

(Human - Body Model)

VESD (HBM)

Temperature: 23 ± 5℃

Based%on ANSI/ESDA/JEDEC JS - 001 - 2014

2000

Electrostatic Discharge

(Charged - Device Model)

VESD (CDM)

Temperature: 23 ± 5℃

Based%on JEDEC EIA/JESD22 - C101F

500

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CONFIDENTIAL

Dimensions

PCB Thickness

Module Thickness

Module Length

Unit: mm

Module Width

3.20±0.10

0.80±0.10

18.00±0.10

14.30±0.10

12.00±0.10

1.50±0.10

ESP-WROOM-02UC DIMENSIONS

Top View

Side View

Bottom View

2.80±0.10

3.00±0.10

15.70±0.10

12.75±0.10

8.85±0.10

11.50±0.10

0.90±0.10

0.45±0.10

0.90±0.10

0.85±0.1

0.90±0.10

1.50±0.10

12.00±0.10

6.50±0.10

2.00±0.10

1.15±0.10

1.75±0.10

0.90±0.10

1.80±0.10

3.40±0.10

4.45±0.10

18.00±0.10

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Figure5-1. ESP-WROOM-02UC Dimensions

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CONFIDENTIAL

Recommended PCB Land Pattern

Recommended PCB Land

Pattern

Unit:mm

1.5x8=12

1.5

17.5

4.29

0.9

7.1

1.4

14.3

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Figure 6-1. Recommended PCB Land Pattern of ESP-WROOM-02UC

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CONFIDENTIAL

Appendix A

A. Appendix—Learning

Resources

A.1. Must-Read Documents

•

ESP8266 Quick Start Guide

Description: This document is a quick user guide to getting started with ESP8266. It includes an introduction to the ESP-LAUNCHER, how to download ﬁrmware on to the board and run it, how to compile the AT application, structure and the debugging

method of RTOS SDK. Basic documentation and other related resources for the ESP8266 are also provided.

•

ESP8266 SDK Getting Started Guide

Description: This document takes ESP-LAUNCHER and ESP-WROOM-02 as examples to introduce how to use ESP8266 SDK. The contents include preparations before

compilation, SDK compilation and ﬁrmware download.

• ESP-WROOM-02 PCB Design and Module Placement Guide

Description: The ESP-WROOM-02 module is designed to be soldered to a host PCB. This document compares six different placements of the antenna on a host board and

provides notes on designing PCB.

•

ESP8266 Hardware Resources

Description: This zip package includes manufacturing speciﬁcations of the ESP8266 board and the modules, manufacturing BOM and schematics.

•

ESP8266 AT Command Examples

Description: This document introduces some speciﬁc examples of using Espressif AT commands, including single connection as a TCP Client, UDP transmission and transparent transmission, and multiple connection as a TCP server.

• ESP8266 AT Instruction Set

Description: This document provides lists of AT commands based on ESP8266_NONOS_SDK, including user-deﬁned AT commands, basic AT commands,

Wi-Fi AT commands and TCP/IP-related AT commands. It also introduces the downloading of AT ﬁrmware into ﬂash.

•

TCP/UDP UART Passthrough Test Demonstration

Description: This guide is intended to help users run a TCP & UDP passthrough test on the ESP8266 IoT platform.

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CONFIDENTIAL

•

FAQ

A.2. Must-Have Resources

ESP8266 SDKs

•

Description: This website page provides links to the latest version of ESP8266 SDK and

the older ones.

•

ESP8266 Tools

Description: This website page provides links to the ESP8266 ﬂash download tools and

ESP8266 performance evaluation tools.

ESP8266 App

•

ESP8266 Certiﬁcation and Test Guide

•

ESP8266 BBS

•

ESP8266 Resources!

•

Appendix A

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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-ESPWROOM02UC" or “Contains FCC ID:2AC7Z-ESPWROOM02UC” Any similar wording that expresses the same meaning may be used.

Espressif IoT T

eam"

www.espressif.com

Disclaimer and Copyright Notice

efer

Information in this document, including URL r 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.

ences, is subject to change without

ESPRESSIF SYSTEMS ESPWROOM02UC User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. Overview

2. Pin Description

3. Functional Description

3.2. Memory

3.2.1. Internal SRAM and ROM

3.2.2. SPI Flash

3.3. Crystal Oscillator

3.4. Interface Description

4. Electrical Characteristics

4.1. Electrical Characteristics

4.2. Wi-Fi Radio

4.3. Power Consumption

Electrostatic Discharge

Dimensions

Recommended PCB Land Pattern

A.1. Must-Read Documents

A.2. Must-Have Resources