Ebyte ESP32-WROOM-32UE User manual

ESP32-WROOM-32UE
User Manual

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
1
Catalog
ESP32-WROOM-32UE.........................................................................................................................................................1
User Manual...................................................................................................................................................................1
Ⅰ Functional Overview............................................................................................................................................ 3
1.1 Introduction................................................................................................................................................ 3
1.2 Features.........................................................................................................................................................3
Ⅱ Electrical Characteristics.............................................................................................................................. 3
2.1 Absolute maximum ratings........................................................................................................................ 3
2.2 Recommended working conditions............................................................................................................ 3
2.3 RF Characteristics.................................................................................................................................... 4
Ⅲ Hardware Description.......................................................................................................................................... 4
3.1 Mechanical size and pin definition.................................................................................................... 4
3.2 Minimal Schematic...................................................................................................................................... 7
3.3 Module size.................................................................................................................................................. 8
3.4 PCB package pattern.................................................................................................................................. 9
Ⅳ AT Command...............................................................................................................................................................9
Ⅴ Common Questions................................................................................................................................................ 10
5.1 Unsatisfactory transmission distance..............................................................................................10
5.2 Module is easily damaged...................................................................................................................... 10
5.3 Bit error rate is too high.................................................................................................................. 10
Ⅵ Welding Operation Guidance............................................................................................................................ 11
6.1 Reflow temperature.................................................................................................................................. 11
6.2 Reflow soldering curve.......................................................................................................................... 11
Ⅶ Disclaimer............................................................................................................................................................ 12
Revise History.......................................................................................................................................................... 12

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
2
Disclaimer and copyright notice
The information in this article, including the URL address for reference, is subject to
change without notice. The document is provided "as is" without any guarantee responsibility,
including any guarantees for merchantability, suitability for specific purposes, or
non-infringement, and any guarantees mentioned elsewhere in any proposals, specifications
or samples. This document does not take any responsibility, including the responsibility
for infringement of any patent rights caused by the use of the information in this document.
This document does not grant any license for the use of intellectual property rights in
estoppel or other ways, whether express or implied.
The test data obtained in the article are all obtained by the Ebyte laboratory, and the
actual results may vary slightly.
All brand names, trademarks and registered trademarks mentioned in this article are the
property of their respective owners, and it is hereby declared.
The final interpretation right belongs to Chengdu Ebyte Electronic Technology Co., Ltd.
Notice
Due to product version upgrades or other reasons, the contents of this manual may change.
Ebyte Electronic Technology Co., Ltd. reserves the right to modify the contents of this manual
without any notice or prompt. This manual is only used as a guide. Chengdu Ebyte Electronic
Technology Co., Ltd. makes every effort to provide accurate information in this manual. However,
Chengdu Ebyte Electronic Technology Co., Ltd. does not guarantee that the contents of the manual
are completely free of errors. All statements in this manual , Information and suggestions do
not constitute any express or implied guarantee.

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
3
Ⅰ Functional Overview
1.1 Introduction
ESP32-WROOM-32UE is a WIFI module based on ESP32-D0WD-V3 chip solution.
ESP32-WROOM-32UE is a universal Wi-Fi module with powerful functions,
built-in ESP32-D0WD-V3 chip, Xtensa® dual-core 32-bit LX6 microprocessor, 448
KB ROM, 520 KB SRAM, 16 KB RTC SRAM supports up to 240 clock frequency in MHz.
Can be used for low-power sensor networks and demanding tasks such as speech
encoding, audio streaming, and MP3 decoding.
1.2 Features
4 MB SPI flash，
Support AT commands;
Support serial communication, flow control. The baud rate supports up to 128000;
Support automatic and manual networking.
Ⅱ Electrical Characteristics
2.1 Absolute maximum ratings
Symbol
Parameter
Minimum
Maximum
Unit
VDD33
Power pin voltage
–0.3
3.6
V
T STORE
Storage temperature
–40
85
°C
Chart 2- 1 Absolute maximum ratings
2.2 Recommended working conditions
Symbol
Parameter
Minimum
Typical
Maximum
Unit
VDD33
Power Pin Voltage
3.0
3.3
3.6
V
IVDD
Supply current of external power
supply
0.5
—
—
A
T
Recommended working temperature
–40
—
85
°C
Humidity
Humidity
—
85
—
%RH
Imax
Peak current
400
mA

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
4
I
Average current
100
mA
Chart 2- 2 Recommended working conditions
2.3 RF Characteristics
Working channel center frequency range
2412~2484MHz
Wi-Fi
Protocol IEEE802.11b/g/n
Antenna type
IPEX Interface
Distance
With router @Mercury MW305R
400m
Between Modules
400m
Chart 2- 3 RF Characteristics
Ⅲ Hardware Description
3.1 Mechanical size and pin definition
Chart 3- 1 Pin layout diagram

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
5
Name
Serial number
Type
Function
GND
1
P
Grounded
3V3
2
P
Powered by
EN
3
I
High level: chip enable;
low level: chip off;
Note: The EN pin cannot be left floating.
SENSOR_VP
4
I
GPIO36, ADC1_CH0, RTC_GPIO0
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
GPIO32, XTAL_32K_P (32.768 kHz Crystal input), ADC1_CH4,
TOUCH9,
RTC_GPIO9
IO33
9
I/O
GPIO33, XTAL_32K_N (32.768 kHz Crystal output), ADC1_CH5,
TOUCH8,
RTC_GPIO8
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
GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK,
HS2_CLK, SD_CLK, EMAC_TXD2
IO12
14
I/O
GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ,
HS2_DATA2, SD_DATA2, EMAC_TXD3
GND
15
P
Grounded
IO13
16
I/O
GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID,
HS2_DATA3, SD_DATA3, EMAC_RX_ER
NC
17
-
See note 1 below the table
NC
18
-
See note 1 below the table
NC
19
-
See note 1 below the table

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
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1 P：power supply；I：Input；O：Output；T：can be set to high impedance.
Chart 3- 2 Pin definition list
NC
20
-
See note 1 below the table
NC
21
-
See note 1 below the table
NC
22
-
See note 1 below the table
IO15
23
I/O
GPIO15, ADC2_CH3, TOUCH3, MTDO, HSPICS0, RTC_GPIO13,
HS2_CMD, SD_CMD, EMAC_RXD3
IO2
24
I/O
GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0,
SD_DATA0
IO0
25
I/O
GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1,
EMAC_TX_CLK
IO4
26
I/O
GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1,
SD_DATA1, EMAC_TX_ER
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
Grounded

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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3.2 Minimal Schematic
Chart 3- 3 Minimal Schematic

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
8
3.3 Module size
Chart 3- 4 Module size

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
9
3.4 PCB package pattern
Chart 3- 5 PCB package
Ⅳ AT Command
For details on AT commands, please refer to the download page <ESP32-WROOM-32UE_AT_Bin_V2.2.0.0>

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
10
Ⅴ Common Questions
5.1 Unsatisfactory transmission distance
When there is a straight line communication obstacle, the communication distance will be attenuated
accordingly;
Temperature, humidity, and co-frequency interference will increase the communication packet loss rate;
The ground absorbs and reflects radio waves, and the test effect is poor when it is close to the ground;
Sea water has a strong ability to absorb radio waves, so the seaside test effect is poor;
If there is a metal object near the antenna or placed in a metal shell, the signal attenuation will be very
serious;
The power register is set incorrectly, and the air speed is set too high (the higher the air speed, the closer
the distance);
The low voltage of the power supply at room temperature is lower than the recommended value, the lower the
voltage, the lower the power output.
5.2 Module is easily damaged
Please check the power supply to ensure that it is within the recommended power supply voltage. If it exceeds
the maximum value, it will cause permanent damage to the module;
Please check the stability of the power supply, and the voltage should not fluctuate greatly and frequently;
Please ensure that the installation and use process is anti-static, and high-frequency components are
electrostatically sensitive;
Please ensure that the humidity should not be too high during installation and use, and some components are
humidity sensitive devices;
If there is no special requirement, it is not recommended to use it at too high or too low temperature.
5.3 Bit error rate is too high
There is co-frequency signal interference nearby, stay away from the interference source or modify the
frequency and channel to avoid interference;
The clock waveform on the UART is not standard, check whether there is interference on the UART line;
Unsatisfactory power supply may also cause garbled codes, so the reliability of the power supply must be
ensured;

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
11
Ⅵ Welding Operation Guidance
6.1 Reflow temperature
Profile Feature
Curve characteristics
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Tin paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）
Minimum preheating temperature
100℃
150℃
Preheat temperature max (Tsmax)
Maximum preheating temperature
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
Preheat time
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
Average ascent rate
3℃/second max
3℃/second max
Liquidous Temperature (TL)
Liquidus temperature
183℃
217℃
Time（tL）Maintained Above（TL）
Time above liquidus
60-90 sec
30-90 sec
Peak temperature（Tp）
Peak temperature
220-235℃
230-250℃
Aveage ramp-down rate（Tp to Tsmax）
Average rate of descent
6℃/second max
6℃/second max
Time 25℃ to peak temperature
Time from 25℃ to peak temperature
6 minutes max
8 minutes max
6.2 Reflow soldering curve

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-WROOM-32UE User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
12
Ⅶ Disclaimer
This manual shall try its best to provide a comprehensive and detailed introduction based on the existing
information. The company reserves the right to modify the content of the manual without further notice.
This manual is only used as a guide, all the information in the manual does not constitute any express or
implied guarantee.
Revise History
Version
Revision Date
Revision Description
Maintainer
1.0
2021-12-14
初始版本
-
About us
Hotline：[phone]
Phone Number：028-61399028
Technical Support：[email protected] Official Website：www.ebyte.com
Company Address：Building B2 and Building B5, No. 199, West District Avenue,
High-tech West District, Chengdu, Sichuan Province.