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 ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
2
Contents
Disclaimer .................................................................................................................................................................................................3
1 Product Overview ................................................................................................................................................................................4
1.1 Introduction ..............................................................................................................................................................................4
1.2 Feature .......................................................................................................................................................................................4
2 Electric Feature ....................................................................................................................................................................................4
2.1 Absolute Maximum Ratings ................................................................................................................................................ 4
2.2 Recommended Working Conditions ..................................................................................................................................4
2.3 RF Characteristics.................................................................................................................................................................. 5
3 Hardware Description ........................................................................................................................................................................ 5
3.1 Size and Pins Definition ....................................................................................................................................................... 5
3.2 Schematic ................................................................................................................................................................................. 7
3.3 Module Size ............................................................................................................................................................................. 7
3.4 PCB Package ........................................................................................................................................................................... 8
3.5 External Antenna Connector Size ...................................................................................................................................... 9
4 AT Command........................................................................................................................................................................................9
5 FAQ...................................................................................................................................................................................................... 10
5.1 Communication range is too short ...................................................................................................................................10
5.2 Module is easy to damage ..................................................................................................................................................10
5.3 BER(Bit Error Rate) is high ..............................................................................................................................................10
6 Production Guidance........................................................................................................................................................................11
6.1 Reflow Soldering temperature ..........................................................................................................................................11
6.2 Reflow Soldering Curve .....................................................................................................................................................11
Revision History ...................................................................................................................................................................................13
About us..................................................................................................................................................................................................13

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
3
Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit https://www.ru-ebyte.com.

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
4
1 Product Overview
1.1 Introduction
ESP32-C3-MINI-1U is a WIFI module based on the ESP32-C3 chip.
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 a RISC-V 32-bit single-core processor.
The chip integrates rich 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 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 Feature
4 MB embedded flash;
Support AT command;
Serial communication and flow control available. The baud rate supports up to 128000;
Support automatic and manual networking.
2 Electric Feature
2.1 Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Unit
VDD33
Power pin voltage
–0.3
3.6
V
TSTORE
Storage temperature
–40
85
°C
Table 2- 1 Absolute Maximum Ratings
2.2 Recommended Working Conditions
Symbol
Parameter
Min
Typ
Max
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

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
5
Imax
Peak current
400
mA
I
Average current
100
mA
Table 2- 2 Recommended Working Conditions
2.3 RF Characteristics
Working channel central frequency
2412~2484MHz
Wi-Fi
IEEE802.11b/g/n
Antenna
IPEX
Distance
Module and router
300m
Between modules
300m
Table 2- 3 RF characteristics
3 Hardware Description
3.1 Size and Pins Definition
Figure 3- 1 Pins Layout
Name
Number
Type
Function
GND
1, 2, 11, 14,
P
Ground

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
6
1 P：Power；I：Input；O：Output；T：Three-state logic.
Table 3- 2 Pins Definition
Note：
Function
ESP Dev Pins
Other device pins
Download firmware/Output diary 1
UARTO：GPIO20 (RX) ，
GPIO21(TX)
PC：TX、RX
AT Command/Respond 2
UART1：GPIO6(RX)，GPIO7(TX)，
GPIO5(CTS)，GPIO4(RTS)
USB to UART module：TX，RX，
RTS，CTS
Please refer to AT Command Sets for more details.
Table 3- 3 ESP32-C3 series hardware connection pins
36-53
3V3
3
P
Power
NC
4, 7, 9, 10,
15, 17, 24,
25, 28, 29,
32-35
—
Empty pins
IO2
5
I/O/T
GPIO2, ADC1_CH2, FSPIQ
IO3
6
I/O/T
GPIO3, ADC1_CH3
EN
8
I
High level：chip enabled；Low level：chip
disabled
Note: Pin EN cannot be floated
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 ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
7
3.2 Schematic
Figure 3- 3 Schematic
3.3 Module Size
Figure 3- 4 Module Size

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
8
3.4 PCB Package
Figure 3- 5 PCB Package

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
9
3.5 External Antenna Connector Size
Figure 3- 6 External antenna connector size
4 AT Command
Please download file ESP32-C3-MINI-1U_AT_Bin_V2.2.0.0 from Ebyte website.

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
10
5 FAQ
5.1 Communication range is too short
The communication distance will be affected when obstacle exists.
Data lose rate will be affected by temperature, humidity and co-channel interference.
The ground will absorb and reflect wireless radio wave, so the performance will be poor when testing near ground.
Sea water has great ability in absorbing wireless radio wave, so performance will be poor when testing near the sea.
The signal will be affected when the antenna is near metal object or put in a metal case.
Power register was set incorrectly, air data rate is set as too high (the higher the air data rate, the shorter the distance).
The power supply low voltage under room temperature is lower than recommended value, the lower the voltage, the lower the
transmitting power.
5.2 Module is easy to damage
Please check the power supply source, ensure it is in right range, voltage higher than maximum value will damage the module.
Please check the stability of power source, the voltage cannot fluctuate too much.
Please make sure antistatic measure are taken when installing and using, high frequency devices have electrostatic susceptibility.
Please ensure the humidity is within limited range, some parts are sensitive to humidity.
Please avoid using modules under too high or too low temperature.
5.3 BER(Bit Error Rate) is high
There are co-channel signal interference nearby, please be away from interference sources or modify
frequency and channel to avoid interference;
The clock waveform on the UART is not standard. Check whether there is interference on the UART line;
The power supply is not ideal and may cause messy code. It is necessary to ensure the reliability of the power
supply;

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
11
6Production Guidance
6.1 Reflow Soldering Temperature
Profile Feature
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）
100℃
150℃
Preheat temperature max (Tsmax)
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
3℃/second max
3℃/second max
Liquidous Temperature (TL)
183℃
217℃
Time（tL）Maintained Above（TL）
60-90 sec
30-90 sec
Peak temperature（Tp）
220-235℃
230-250℃
Aveage ramp-down rate（Tp to Tsmax）
6℃/second max
6℃/second max
Time 25℃ to peak temperature
max 6 minutes
max 8 minutes
6.2 Reflow Soldering Curve

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
12
7 Package for Batch Order

Chengdu Ebyte Electronic Technology Co.,Ltd ESP32-C3-MINI-1U User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
13
Revision History
Version
Date
Description
Issued by
1.0
2021-12-14
Initial version
-
1.1
2022-10-26
Content updated
Hao
1.2
2023-1-5
Content updated
Hao
About us
Technical support: [e-mail]
Documents and RF Setting download link: https://www.ru-ebyte.com
Thank you for using Ebyte products! Please contact us with any questions or suggestions: [email protected]om
-------------------------------------------------------------------------------------------------
Official hotline:[phone]
Web: https://www.ru-ebyte.com
Address: , Building B5, Mould Industrial Park, 199# Xiqu Ave, High-tech Zone, Chengdu, 611731, Sichuan, China