Ebyte E78 Series User manual

ASR6505 Wireless Module
E78 series User Manual

Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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CONTENTS
1. GENERAL INTRODUCTION.............................................................................................................................................................. 2
1.1 MAIN PARAMETER......................................................................................................................................................... 2
1.2 PARAMETER DESCRIPTION............................................................................................................................................. 3
2. PIN DEFINITION....................................................................................................................................................................................4
3. E78-400M22S1A PROGRAMMING INTERFACE............................................................................................................................... 6
4. PRODUCTION GUIDANCE.................................................................................................................................................................. 7
4.1 REFLOW SOLDERING TEMPERATURE.............................................................................................................................. 7
4.2 REFLOW SOLDERING CURVE.......................................................................................................................................... 8
5. FAQ.......................................................................................................................................................................................................... 8
5.1 COMMUNICATION RANGE IS TOO SHORT........................................................................................................................8
5.2 MODULE IS EASY TO DAMAGE....................................................................................................................................... 9
6. IMPORTANT STATEMENT.................................................................................................................................................................. 9
REVISION HISTORY..................................................................................................................................................................................9
ABOUT US.................................................................................................................................................................................................. 9

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
2
1. General introduction
E78 series are RF transceiver module of various frequency bands designed
and manufactured by Chengdu Ebyte, with long communication distance and
extremely low power mode current consumption. It is a small-sized SMD type (pin
pitch 1.1mm).
E78-400M22S1A adopts ASR6505 chip from ASR Company. This chip is an
ultra-low-power LoRa integrated single-chip SoC. It uses Semtech advanced
low-power LoRa Transceiver SX1262 and integrates a STM8L152 low-power MCU,
Flash capacity 64kB, SRAM Capacity 4kB, EEPROM capacity 2K, small-sized, ultra-low power consumption, for
LoRaWAN, LinkWAN multiple protocol standards, applicable for a variety of IoT application scenarios, is currently the
best choice for LPWAN applications.
It is a hardware platform, cannot be used independently. Users need to conduct secondary development. (We can
customize standard LoRaWan, Ali linkWan nodes).
1.1 Main parameter
Model No.
Frequency
Transmit
power
Reference distance(stamp
hole/IPEX)
Package
Antenna
E78-400M22S1A
410-490MHz
21dBm
5.5km(Lora 1kbps)
SMD
Stamp hole/IPEX
Model No.
Core IC
Size
Net weight
working
temperatu
re
Working
humidity
Storage
temperatu
re
E78-400M22S1A
ASR6505
26* 16*2.8 mm
1.9g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
Parameter category
Min
Typ
Max
Unit
Transmit
current([email protected]
ps)
100
110
120
mA
Receiving
current([email protected]
ps)
13
14
15
mA
Shutdown current
1.6
2
2.6
uA
Transmit power
20.6
20.8
21
dBm
Receiving
sensitivity
-139
-140
-140
dBm
TCXO crystal
32
32
32
MHz

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
3
TCXO crystal voltage
configuration
1.8
1.8
3.3
V
Recommended
operating frequency
410
433/470/490
490
MHz
Power supply
voltage
2.6
3.3
3.7
V
Communication
level
2.6
3.3
3.7
V
1.2 Parameter description
When designing the power supply circuit for the module, it is recommended to reserve more than 30% of the
remaining amount, and the whole machine is conducive to long-term stable operation；
The current required for the instant of launch is large but often because the launch time is extremely short, the total
energy consumed may be smaller；
When customers uses an external antenna, the impedance matching degree between the antenna and the module at
different frequency points will affect the magnitude of the transmission current to varying degrees;
The current consumed by the RF chip in the pure receiving state is called the receiving current. Some RF chips
with communication protocols or developers have loaded some self-developed protocols on the whole machine,
which may cause the receiving current of the test to be too large；
The current in the purely receiving state is often mA level, and the "receiving current" of the μA level needs to be
processed by the developer through software;
The shutdown current is often much smaller than the current consumed by the power supply part of the whole
machine at no load, without being overly demanding;
Since the material itself has a certain error, a single LRC component has an error of ±0.1%. However, since a
plurality of LRC components are used in the entire RF loop, there is a case where error accumulation occurs,
resulting in a difference in emission current and reception current of different modules;
Reducing the transmit power can reduce power consumption to some extent, but reducing the transmit power
emissions for a number of reasons reduces the efficiency of the internal PA.

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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2. Pin definition
No.
Name
Direction
Function
1
GND
Ground wire, connected to the power reference ground
2
LCD-SEG1
0
Input/output
MCU GPIO
3
LCD-SEG1
1
Input/output
MCU GPIO
4
LCD-SEG1
2
Input/output
MCU GPIO
5
LCD-SEG1
3
Input/output
MCU GPIO
6
LCD-SEG1
4
Input/output
MCU GPIO
7
LCD-SEG1
5
Input/output
MCU GPIO
8
LCD-SEG1
6
Input/output
MCU GPIO

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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9
LCD-SEG1
7
Input/output
MCU GPIO
10
I2C-SDA
Input/output
I2C-SDA pin
11
I2C-SCL
Input/output
I2C-SCL pin
12
ADC-IN0
Input
ADC input pin
13
ADC-IN1
Input
ADC input pin
14
GPIO2
Input/output
MCU GPIO
15
GPIO3
Input/output
MCU GPIO
16
GPIO4
Input/output
MCU GPIO
17
ADC_IN2
Input
ADC input pin
18
GND
Ground wire, connected to the power reference ground
19
ANT
output
Antenna interface, stamp hole (50 ohm characteristic impedance)
20
GND
Ground wire, connected to the power reference ground
21
GND
Ground wire, connected to the power reference ground
22
GND
Ground wire, connected to the power reference ground
23
GND
Ground wire, connected to the power reference ground
24
SPI-NSS
Input
SPI select pin, can select external SPI
25
SPI-SCK
Input
SPI-SCK pin, can be used as external SPI
26
SPI_MISO
output
SPI_MISO pin, can be used as external SPI
27
SPI_MOSI
Input
SPI MOSI pin, can be used as external SPI
28
LCD-SEG1
MCU GPIO
29
LCD-SEG2
Input/output
MCU GPIO
30
SWIM
Input/output
Program burning pin
31
NRST
Input
External reset pin
32
LCD-COM
0
Input/output
MCU GPIO
33
LCD-COM
1
Input/output
MCU GPIO
34
LCD-COM
2
Input/output
MCU GPIO
35
VREFP
Input
ADC reference voltage input
36
UART1-RX
Input
UART1-RX pin
37
UART1-TX
output
UART1-TX pin
38
VLCD
Input
VLCD pin
39
LCD-SEG0
Input/output
MCU GPIO
40
GND
Ground wire, connected to the power reference ground
41
LCD-SEG3
Input/output
MCU GPIO
42
LCD-COM
3
Input/output
MCU GPIO
43
LCD-SEG4
Input/output
MCU GPIO
44
LCD-SEG5
Input/output
MCU GPIO
45
UART0-RX
Input
UART0-RX pin

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
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46
UART0-TX
output
UART0-TX pin
47
LCD-SEG6
Input/output
MCU GPIO
48
LCD-SEG7
Input/output
MCU GPIO
49
LCD-SEG8
Input/output
MCU GPIO
50
LCD-SEG9
Input/output
MCU GPIO
51
VCC
Power supply, range 2.5V ~ 3.7V (recommended to add external ceramic
filter capacitor)
52
GND
Ground wire, connected to the power reference ground
★For the pin definition, software driver and communication protocol of the module, please refer to ASR official
《ASR6501 Datasheet》 ★
3. E78-400M22S1A Programming interface
Note: If users use the E78-400M22S1A module to develop by themselves, it is recommended to use the test board
E78-400TBL-01A made by our company for the E78 module first, which is convenient for users. Users can decide
according to his own needs.

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
7
The base plate supplies power to the module through the serial port on the left in the picture above. Connect ST-LINK's
NRST pin and SWIM pin to the base plate to download the program. As shown below
4. Production guidance
4.1 Reflow soldering temperature
Profile Feature
Curve characteristics
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Solder paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）
Min preheating temp.
100℃
150℃
Preheat temperature max (Tsmax)
Max preheating temp.
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
Preheating time
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
Average ramp-up rate
3℃/second max
3℃/second max
Liquidous Temperature (TL)
Liquid phase temp.
183℃
217℃
Time（tL）Maintained Above（TL）
Time below liquid
phase line
60-90 sec
30-90 sec
Peak temperature（Tp）
Peak temp
220-235℃
230-250℃
Aveage ramp-down rate（Tp to Tsmax）
Average ramp-down
rate
6℃/second max
6℃/second max
Time 25℃to peak temperature
Time to peak
temperature for 25℃
6 minutes max
8 minutes max

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
8
4.2 Reflow soldering curve
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 2.5V, the lower the voltage, the lower the
transmitting power.
Due to antenna quality or poor matching between antenna and module.

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
9
5.2 Module is easy to damage
Please check the power supply, ensure it is between the recommended values, voltage exceed the maximum than
will cause permanent damage to the module.
Please check the stability of power supply, 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.
6. Important statement
EBYTE reserves the right of final interpretation and modification of all contents in this manual.
As the hardware and software of the product continue to improve, this manual may be subject to change without
further notice, and the final version of the manual shall prevail.
Users who use this product need to pay attention to product dynamics on the official website so that users can get
the latest information of this product in time.
Revision history
Version
Date
Description
Issued by
1.0
2019/11/04
Initial version
1.1
2019/12/19
Format adjustment
Ren
About us
Technical support: [e-mail]
Documents and RF Setting download link:：www.ebyte.com
Thank you for using Ebyte products! Please contact us with any questions or suggestions: [e-mail]
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Web: www.ebyte.com
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