Ebyte E78 Series User manual

ASR6505 Wireless Module

E78 series User Manual

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

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

Working

humidity

Storage

temperatu

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

Receiving

current([email protected]

ps)

Shutdown current

1.6

2.6

Transmit power

20.6

20.8

dBm

Receiving

sensitivity

-139

-140

dBm

TCXO crystal

MHz

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual

TCXO crystal voltage

configuration

1.8

3.3

Recommended

operating frequency

410

433/470/490

490

MHz

Power supply

voltage

2.6

3.3

3.7

Communication

level

2.6

3.3

3.7

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

2. Pin definition

No.

Name

Direction

Function

GND

Ground wire, connected to the power reference ground

LCD-SEG1

Input/output

MCU GPIO

LCD-SEG1

Input/output

MCU GPIO

LCD-SEG1

Input/output

MCU GPIO

LCD-SEG1

Input/output

MCU GPIO

LCD-SEG1

Input/output

MCU GPIO

LCD-SEG1

Input/output

MCU GPIO

LCD-SEG1

Input/output

MCU GPIO

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual

LCD-SEG1

Input/output

MCU GPIO

I2C-SDA

Input/output

I2C-SDA pin

I2C-SCL

Input/output

I2C-SCL pin

ADC-IN0

Input

ADC input pin

ADC-IN1

Input

ADC input pin

GPIO2

Input/output

MCU GPIO

GPIO3

Input/output

MCU GPIO

GPIO4

Input/output

MCU GPIO

ADC_IN2

Input

ADC input pin

GND

Ground wire, connected to the power reference ground

ANT

output

Antenna interface, stamp hole (50 ohm characteristic impedance)

GND

Ground wire, connected to the power reference ground

GND

Ground wire, connected to the power reference ground

GND

Ground wire, connected to the power reference ground

GND

Ground wire, connected to the power reference ground

SPI-NSS

Input

SPI select pin, can select external SPI

SPI-SCK

Input

SPI-SCK pin, can be used as external SPI

SPI_MISO

output

SPI_MISO pin, can be used as external SPI

SPI_MOSI

Input

SPI MOSI pin, can be used as external SPI

LCD-SEG1

MCU GPIO

LCD-SEG2

Input/output

MCU GPIO

SWIM

Input/output

Program burning pin

NRST

Input

External reset pin

LCD-COM

Input/output

MCU GPIO

LCD-COM

Input/output

MCU GPIO

LCD-COM

Input/output

MCU GPIO

VREFP

Input

ADC reference voltage input

UART1-RX

Input

UART1-RX pin

UART1-TX

output

UART1-TX pin

VLCD

Input

VLCD pin

LCD-SEG0

Input/output

MCU GPIO

GND

Ground wire, connected to the power reference ground

LCD-SEG3

Input/output

MCU GPIO

LCD-COM

Input/output

MCU GPIO

LCD-SEG4

Input/output

MCU GPIO

LCD-SEG5

Input/output

MCU GPIO

UART0-RX

Input

UART0-RX pin

Chengdu Ebyte Electronic Technology Co., Ltd E78-400M22S1A User Manual

UART0-TX

output

UART0-TX pin

LCD-SEG6

Input/output

MCU GPIO

LCD-SEG7

Input/output

MCU GPIO

LCD-SEG8

Input/output

MCU GPIO

LCD-SEG9

Input/output

MCU GPIO

VCC

Power supply, range 2.5V ~ 3.7V (recommended to add external ceramic

filter capacitor)

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

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

Average ramp-up rate(Tsmax to Tp)

Average ramp-up rate

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

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

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

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: support@cdebyte.com

Documents and RF Setting download link:：www.ebyte.com

Thank you for using Ebyte products! Please contact us with any questions or suggestions: info@cdebyte.com

-------------------------------------------------------------------------------------------------

Official hotline: 028-61399028 ext. 821

Web: www.ebyte.com

Address: Innovation Center D347, 4# XI-XIN Road,Chengdu, Sichuan, China

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