Ebyte ESP32-C3-MINI-1U User manual

ESP32-C3-MINI-1U
User Manual

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
1
Catalog
ESP32-C3-MINI-1U.........................................................................................................................................................1
User Manual...................................................................................................................................................................1
ⅠFunctional 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............................................................................................................ 4
2.3 RF Characteristics.................................................................................................................................... 4
Ⅲ Hardware Description.......................................................................................................................................... 5
3.1 Mechanical size and pin definition.................................................................................................... 5
3.2 Minimal Schematic...................................................................................................................................... 6
3.3 Module size.................................................................................................................................................. 7
3.4 PCB package pattern.................................................................................................................................. 8
3.5 External Antenna Connector Size.......................................................................................................... 9
Ⅳ AT Command...............................................................................................................................................................9
ⅤCommon 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
About us.......................................................................................................................................................................12

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U 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-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
3
ⅠFunctional Overview
1.1 Introduction
ESP32-C3-MINI-1U is a WIFI module based on the ESP32-C3 chip solution.
ESP32-C3-MINI-1U is a general-purpose Wi-Fi module, small in size, rich in
peripheral interfaces, equipped with 4 MB embedded flash, and equipped with a
RISC-V 32-bit single-core processor. The chip integrates a wealth of peripherals,
including UART, I2C, I2S, infrared remote control module (remote control
peripheral), LED PWM controller, general DMA controller, TWAI® controller, USB
serial port/JTAG controller, temperature sensor and analog /Digital converter,
also has a single-wire, two-wire, four-wire SPI interface.
It can be used in smart home, industrial automation, healthcare, consumer
electronics and other fields.
1.2 Features
4 MB embedded flash;
Support AT commands;
Support serial communication and flow control. The baud rate is 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

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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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
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
300m
Between Modules
300m
Chart 2- 3 RF Characteristics

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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Ⅲ Hardware Description
3.1 Mechanical size and pin definition
Chart 3- 1 Pin layout diagram
Name
Serial number
Type
Function
GND
1, 2, 11, 14,
36-53
P
Grounded
3V3
3
P
Powered by
NC
4, 7, 9, 10,
15, 17, 24,
25, 28, 29,
32-35
—
Empty pin
IO2
5
I/O/T
GPIO2, ADC1_CH2, FSPIQ
IO3
6
I/O/T
GPIO3, ADC1_CH3
EN
8
I
High level: chip enable;
low level: chip off;

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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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
3.2 Minimal Schematic
Chart 3- 3 Minimal Schematic
Be careful not to let the EN pin float.
IO0
12
I/O/T
GPIO0, ADC1_CH0, XTAL_32K_P
IO1
13
I/O/T
GPIO1, ADC1_CH1, XTAL_32K_N
IO10
16
I/O/T
GPIO10, FSPICS0
IO4
18
I/O/T
GPIO4, ADC1_CH4, FSPIHD, MTMS
IO5
19
I/O/T
GPIO5, ADC2_CH0, FSPIWP, MTDI
IO6
20
I/O/T
GPIO6, FSPICLK, MTCK
IO7
21
I/O/T
GPIO7, FSPID, MTDO
IO8
22
I/O/T
GPIO8
IO9
23
I/O/T
GPIO9
IO18
26
I/O/T
GPIO18, USB_D-
IO19
27
I/O/T
GPIO19, USB_D+
RXD0
30
I/O/T
GPIO20, U0RXD
TXD0
31
I/O/T
GPIO21, U0TXD

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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3.3 Module size
Chart 3- 4 Module size

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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3.4 PCB package pattern
Chart 3- 5 PCB package

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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3.5 External Antenna Connector Size
Chart 3- 6 External Antenna Connector Size
Ⅳ AT Command
For AT commands, please refer to the download page《ESP32-C3-MINI-1U_AT_Bin_V2.2.0.0》

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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ⅤCommon 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
ensure

Chengdu Ebyte Electronic Technology Co.,Ltd. ESP32-C3-MINI-1U 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-C3-MINI-1U 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
Initial version
-
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.