ESPRESSIF SYSTEMS ESP-WROOM-02D4 Datasheet

www.espressif.com

Version 1.7

Espressif Systems

ESP-WROOM-02D/02U

Datasheet

Includes:

ESP-WROOM-02D

ESP-WROOM-02U

About This Guide

This document provides introduction to the speciﬁcations of ESP-WROOM-02D and ESPWROOM-02U 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

2017.11

V1.0

First release.

2018.03

V1.1

Updated the ﬁgure of ESP-WROOM-02U dimensions.

2018.08

V1.2

• Updated Table 1-1 and Table 1-2;

• Updated module dimensions;

• Added PCB pattern;

• Updated document cover.

2019.04

V1.3

•

Added MSL information in table 1-2;

•

Added notes in Figure 5-1 and Figure 5-2.

2019.08

V1.4

Updated Chapter 6 Peripheral Schematics.

2019.12

V1.5

• Added a note for the reﬂow proﬁle;

• Added feedback links.

2019.12

V1.6

Updated a typo in ESP-WROOM-02D dimensions.

2020.07

V1.7

• Updated Note in Chapter 6;

• Updated links in Appendix.

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. Schematics 12 ..........................................................................................................................

6. Peripheral Schematics 14 ........................................................................................................

7. Dimensions 15 ..........................................................................................................................

8. Recommended PCB Land Pattern 17 .....................................................................................

9. U.FL Connector Dimensions 19 ...............................................................................................

A. Appendix—Learning Resources 20 .........................................................................................

A.1. Must-Read Documents! 20"..........................................................................................................

A.2. Must-Have Resources! 21............................................................................................................

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1. Overview

ESP-WROOM-02D and ESP-WROOM-02U are ESP8266EX-based modules developed by Espressif. Compared to ESP-WROOM-02, the RF performance of ESP-WROOM-02D and

ESP-WROOM-02U are optimized. Besides, ESP-WROOM-02U integrates a U.FL connector. Please see Chapter 8 for details of U.FL connector.

Table 1-1. ESP-WROOM-02D vs. ESP-WROOM-02U

Module

ESP-WROOM-02D

ESP-WROOM-02U

Core

ESP8266

Antenna

Onboard antenna

IPEX antenna

Dimensions

(unit: mm)

(18.00 ± 0.10) x (20.00 ± 0.10) x (3.20 ±

0.10)

See Figure 6-1 for details.

(18.00 ± 0.10) x (14.30 ± 0.10) x (3.20 ±

0.10)

See Figure 6-2 for details.

Schematics

See Figure 5-1 for details.

See Figure 5-2 for details.

📖 Note:

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

Table 1-2. ESP-WROOM-02D/ESP-WROOM-02U Speciﬁcations

2. Pin Description

Figure 2-1 shows the pin distribution of the ESP-WROOM-02D.

!

Figure 2-1. ESP-WROOM-02D Pin Layout (Top View)

ESP-WROOM-02D and ESP-WROOM-02U have 18 pins. Please see the pin deﬁnitions in Table 2-1.

19GND

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

📖 Note:

The pin layout of ESP-WROOM-02U is the same with that of ESP-WROOM-02D, but it has no keepout zone for PCB antenna.

Table 2-1. ESP-WROOM-02U/ESP-WROOM-02D Pin Deﬁnitions

No.

Pin Name

Functional Description

1

3V3

3.3 V 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.

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2. Pin Description

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.

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

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

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

No.

Pin Name

Functional Description

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3. Functional Description

3.1. CPU

The ESP8266EX integrates a Tensilica L106 32-bit RISC processor, which achieves extralow power consumption and reaches a maximum clock speed of 160 MHz. The Real-Time

Operating System (RTOS) and Wi-Fi stack allow 80% of the processing power to be available for user application programming and development. The CPU includes the interfaces as below:

•

Programmable RAM/ROM interfaces (iBus), which can be connected with memory controller, and can also be used to visit ﬂash.

• Data RAM interface (dBus), which can connected with memory controller.

• AHB interface which can be used to visit the register.

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-02D and ESP-WROOM-02U currently integrate a 2-MB SPI ﬂash. ESPWROOM-02U 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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3. Functional Description

3.3. Crystal Oscillator

ESP-WROOM-02U and ESP-WROOM-02D use 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.

IR

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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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 = 3.3 V, 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

V

Input logic level low

VIL–0.3-0.25 VDD

V

Input logic level high

VIH0.75 VDD

-

VDD + 0.3

V

Output logic level low

VOL--0.1 VDD

V

Output logic level high

VOH0.8 VDD

--V

Table 4-2. Wi-Fi Radio Characteristics

Description

Min

Typ

Max

Unit

Input frequency

2412

-

2483.5

MHz

Input reﬂection

-　-–10

dB

Output Impedance

-*-

Ω

Output Power

PA output power at 72.2 Mbps

131415

dBm

PA output power in 11b mode

19.52020.5

dBm

Sensitivity

DSSS, 1 Mbps

-

–98-dBm

CCK, 11 Mbps

-

–91-dBm

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4. Electrical Characteristics

4.3. Power Consumption

The following power consumption data were obtained from the tests with a 3.3 V 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-

dB

OFDM, 54 Mbps

-21-

dB

HT20, MCS0

-37-

dB

HT20, MCS7

-20-

dB

Description

Min

Typ

Max

Unit

📖 Note:

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

Table 4-3. Power Consumption

Modes

Min

Typ

Max

Unit

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

-

170-mA

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

-

140-mA

Tx 802.11 n, MCS7, POUT = +13 dBm

-

120-mA

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

-50-

mA

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

-56-

mA

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

-56-

mA

Modem-sleep①

-15-

mA

Light-sleep②

-

0.9-mA

Deep-sleep③

-20-

μA

Power Off

-

0.5-μA

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4. Electrical Characteristics

4.4. Reﬂow Proﬁle



Figure 4-1. ESP-WROOM-02D/ESP-WROOM-02U Reﬂow Proﬁle

📖 Notes:

① Modem-sleep is used when such applications as PWM or I2S require the CPU to be working. In cases

where Wi-Fi connectivity is maintained and data transmission is not required, the Wi-Fi Modem circuit can be shut down to save power, according to 802.11 standards (such as U-APSD). For example, in DTIM3, when ESP8266EX sleeps for 300 ms and wakes up for 3 ms to receive Beacon packages from AP, the overall average current consumption is about 15 mA.

② Light-sleep is used for applications whose CPU may be suspended, such as Wi-Fi switch. In cases

where Wi-Fi connectivity is maintained and data transmission is not required, the Wi-Fi Modem circuit and CPU can be shut down to save power, according to 802.11 standards (such as U-APSD). For example, in DTIM3, when ESP8266EX sleeps for 300 ms and wakes up for 3 ms to receive Beacon packages from AP, the overall average current consumption is about 0.9 mA.

③ Deep-sleep is for applications that do not require Wi-Fi connectivity but only transmit data over long time

lags, e.g., a temperature sensor that measures temperature every 100s. For example, when ESP8266EX sleeps for 300 s then wakes up to connect to AP (taking about 0.3 ~ 1 s), the overall average current consumption is far less than 1 mA. The current consumption of 20 μA was obtained at the voltage of 2.5 V.

50

150

0

25

1 ~ 3℃/s

0

200

250

200

-1 ~ -5℃/s

Cooling zone

100

217

50

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℃ 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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4. Electrical Characteristics

4.5. Electrostatic Discharge

📖 Note:

Solder the module in a single reﬂow. If the PCBA requires multiple reﬂows, place the module on the PCB during the ﬁnal reﬂow.

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

2

2000

V Electrostatic Discharge

(Charged - Device Model)

VESD (CDM)

Temperature: 23 ± 5 ℃

Based%on JEDEC EIA/JESD22 - C101F

C2

500

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5. Schematics

!

Figure 5-1. ESP-WROOM-02D Schematics!

5

4

3

2

1

The values of C4, L1 and L2

vary with the actual PCB board.

The values of C1 and C2 vary with

the selection of the crystal.

GPIO15

RST

SD_D1

SD_D0

SD_CLK

SD_CMD

SD_D3

SD_D2

SD_CLK

SD_CMD

SD_D2

UTXDA

WIFI_ANT

GPIO14

GPIO12

URXD

GPIO13

GPIO16

GPIO0

CH_PU

GPIO2

GPIO4

GPIO5

CH_PU

GPIO14

GPIO12

GPIO13

GPIO15

GPIO2

GPIO0

GPIO4

GPIO5

URXD

UTXD

RST

TOUT

GPIO16

TOUT

SD_D3

SD_D0

SD_D1

UTXD

GND

VDD33

GND

GNDGND

GND

VDD33

GND

VDD33

GND

VDD33

GND

VDD33

GND

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ANT1

1

2

C2

10pF

D1

LESD8D3.3CAT5G

J18

CON1

1

R1

12K±1%

J5

CON1

1

C7

TBD(NC)

C1

10pF

C3

0.1uF

L3

4.3nH

J10

CON1

1

J13

CON1

1

C8

1uF(NC)

J4

CON1

1

J15

CON1

1

J9

CON1

1

U3

FLASH

/CS

1

DO

2

/WP

3

GND

4

DI

5

CLK6/HOLD

7

VCC

8

L1

TBD

R3 200R

J12

CON1

1

J3

CON1

1

C4

TBD

L2

TBD

J8

CON1

1

C6

1uF

J2

CON1

1

U1

26MHz±10ppm

XIN

1

GND2XOUT

3

GND

4

J11

CON1

1

J7

CON1

1

J1

CON1

1

J14

CON1

1

U2ESP8266EX

VDDA1LNA2VDD3P33VDD3P34VDD_RTC5TOUT6CHIP_EN7XPD_DCDC

8

MTMS

9

MTDI

10

VDDPST

11

MTCK

12

MTDO

13

GPIO2

14

GPIO0

15

GPIO4

16

VDDPST

17

SD_DATA_2

18

SD_DATA_3

19

SD_CMD

20

SD_CLK

21

SD_DATA_0

22

SD_DATA_1

23

GPIO5

24

U0RXD

25

U0TXD

26

XTAL_OUT

27

XTAL_IN

28

VDDD

29

VDDA

30

RES12K

31

EXT_RSTB

32

GND

33

C5

10uF

J16

CON1

1

J6

CON1

1

R2 499R±1%

J17

CON1

1

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5. Schematics

!

Figure 5-2. ESP-WROOM-02U Schematics!

5

4

3

2

1

The values of C4, L1 and L2

vary with the actual PCB board.

The values of C1 and C2 vary with

the selection of the crystal.

GPIO15

RST

SD_D1

SD_D0

SD_CLK

SD_CMD

SD_D3

SD_D2

SD_CLK

SD_CMD

SD_D2

UTXDA

WIFI_ANT

GPIO14

GPIO12

URXD

GPIO13

GPIO16

GPIO0

CH_PU

GPIO2

GPIO4

GPIO5

CH_PU

GPIO14

GPIO12

GPIO13

GPIO15

GPIO2

GPIO0

GPIO4

GPIO5

URXD

UTXD

RST

TOUT

GPIO16

TOUT

SD_D3

SD_D0

SD_D1

UTXD

GND

VDD33

GND

GNDGND

GND

VDD33

GND

VDD33

GND

VDD33

GND

VDD33

GND

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C2

10pF

D1

LESD8D3.3CAT5G

J18

CON1

1

R1

12K±1%

J5

CON1

1

C7

0.1uF(NC)

C1

10pF

C3

0.1uF

L2

TBD

L3

4.3nH

J10

CON1

1

J13

CON1

1

C8

1uF(NC)

J4

CON1

1

J15

CON1

1

J9

CON1

1

U3

FLASH

/CS

1

DO

2

/WP

3

GND

4

DI

5

CLK6/HOLD

7

VCC

8

L1

TBD

R3 200R

J12

CON1

1

J3

CON1

1

J8

CON1

1

C6

1uF

J2

CON1

1

U1

26MHz±10ppm

XIN

1

GND2XOUT

3

GND

4

J11

CON1

1

CON1

IPEX

1

2

3

J7

CON1

1

J1

CON1

1

J14

CON1

1

U2

ESP8266EX

VDDA1LNA2VDD3P33VDD3P34VDD_RTC5TOUT6CHIP_EN7XPD_DCDC

8

MTMS

9

MTDI

10

VDDPST

11

MTCK

12

MTDO

13

GPIO2

14

GPIO0

15

GPIO4

16

VDDPST

17

SD_DATA_2

18

SD_DATA_3

19

SD_CMD

20

SD_CLK

21

SD_DATA_0

22

SD_DATA_1

23

GPIO5

24

U0RXD

25

U0TXD

26

XTAL_OUT

27

XTAL_IN

28

VDDD

29

VDDA

30

RES12K

31

EXT_RSTB

32

GND

33

C5

10uF

C4

TBD

J16

CON1

1

J6

CON1

1

R2 499R±1%

J17

CON1

1

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6. Peripheral Schematics

!

Figure 6-1. ESP-WROOM-02D/ESP-WROOM-02U Peripheral Schematics

EN IO14 IO12 IO13 IO15 IO2 IO0

IO16

IO5

IO4

ADC

RXD

RST

TXD

VDD33

GND

VDD33

GND

GNDGND

GND

J2

BOOT OPTION

1

2

U1

3V3

1

EN

2

IO14

3

IO12

4

IO13

5

IO15

6

IO2

7

IO0

8

GND1

9

IO4

10

RXD

11

TXD

12

GND2

13

IO5

14

RST

15

TOUT

16

IO16

17

GND3

18

P_GND

19

J1

UART DOWNLOAD

1

2

3

C2 0.1uF

C3 0.1uF

R2 10K

C1 10uF

R1 10K

📖 Note:

1. Soldering Pad 19 to the Ground of the base board is not necessary for a satisfactory thermal performance. If users do want to solder it, they need to ensure that the correct quantity of soldering paste

is applied.

2. To ensure the power supply to the ESP8266EX chip during the power-up, it is advised to add an RC delay circuit at the EN pin. The recommended setting for the RC delay circuit is usually R = 10 kΩ and C = 0.1 uF. However, speciﬁc parameters should be adjusted based on the power-up timing of the module and the power-up and reset timing of the ESP8266 chip. For ESP8266EX’s Power-up and Reset Timing Diagram, please refer to Electrical Characteristics in ESP8266EX Datasheet.

3. To improve module’s anti-inference capability, it is advised to reserve an RC delay circuit at the RST pin.

The recommended setting for the RC delay circuit is usually R= 10 kΩ and C = 0.1 uF.

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!

7. Dimensions

!

Figure 7-1. ESP-WROOM-02D Dimensions!

Module Length

Unit: mm

Module Width

Top View

Side View

Bottom View

12.00±0.10

12.30±0.10

15.70±0.10

0.90±0.10

0.85±0.1

0.90±0.10

20.00±0.10

18.00±0.10

ESP-WROOM-02D DIMENSIONS

6.00±0.10

Antenna Area

1.50±0.10

0.90±0.10

1.50±0.10

12.00±0.10

PCB Thickness

Module Thickness

0.80±0.10

3.20±0.10

0.90±0.10

0.45±0.10

󳊺

0.50±0.10

4.00±0.10

6.00±0.10

4.30±0.10

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7. Dimensions

!

Figure 7-2. ESP-WROOM-02U Dimensions!

PCB Thickness

Module Thickness

Module Length

Unit: mm

Module Width

18.00±0.10

14.30±0.10

3.94±0.10

3.90±0.10

4.37±0.10

8.12±0.10

0.90±0.10

0.85±0.1

3.20±0.10

0.80±0.10

18.00±0.10

14.30±0.10

12.00±0.10

1.50±0.10

0.90±0.10

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

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8. Recommended PCB Land Pattern

!

Figure 8-1. Recommended PCB Land Pattern of ESP-WROOM-02D

Unit:mm

7.1

1.5x8=12

20

6

1.5

17.5

4

4.29

4

0.9

1

9

10

18

7.1

18

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8. Recommended PCB Land Pattern

!

Figure 8-2. Recommended PCB Land Pattern of ESP-WROOM-02U

Unit:mm

1.5x8=12

1.5

17.5

4

4.29

4

0.9

1

9

10

18

7.1

1.4

14.3

18

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9. U.FL Connector Dimensions

!

Figure 8-1. Dimensions of ESP-WROOM-02U’s U.FL Connector!

Unit: mm

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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-02U 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-02U 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.

Espressif

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Appendix A

•

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!

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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.

Espressif IoT Team"

www.espressif.com



ESPRESSIF SYSTEMS ESP-WROOM-02D4 Datasheet

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

5. Schematics

6. Peripheral Schematics

7. Dimensions

8. Recommended PCB Land Pattern

9. U.FL Connector Dimensions

A.1. Must-Read Documents

A.2. Must-Have Resources