Ebyte E78-900M22S1A User manual

Chengdu Ebyte Electronic Technology Co.,Ltd E78-900M22S1A user manual

E78-900M22S1A

ASR6505 868/915MHz LoRaWAN RF Module

Chengdu Ebyte Electronic Technology Co.,Ltd E78-900M22S1A user manual

Contents

1.OVERVIEW..............................................................................................................................................................................................3

1.1 INTRODUCTION.............................................................................................................................................................. 3

2 PARAMETERS.........................................................................................................................................................................................4

2.1 LIMIT PARAMETERS:...................................................................................................................................................... 4

2.2 OPERATING PARAMETERS:............................................................................................................................................. 4

3. SIZE AND PIN DEFINITION.................................................................................................................................................................6

3.1 SIZE AND PIN DEFINITION..............................................................................................................................................6

3.2 PIN DEFINITION.............................................................................................................................................................. 7

4 HARDWARE AND SOFTWARE GUIDE............................................................................................................................................... 8

4 PROGRAMMING DIAGRAM AND GUIDE......................................................................................................................................... 9

4.1 E78-900M22S1A BURNING INTERFACE.........................................................................................................................9

5. PRODUCTION GUIDANCE................................................................................................................................................................ 10

5.1 REFLOW SOLDERING TEMPERATURE............................................................................................................................ 10

5.2 REFLOW SOLDERING CURVE........................................................................................................................................ 10

6.FAQ......................................................................................................................................................................................................... 11

6.1 COMMUNICATION RANGE IS TOO SHORT...................................................................................................................... 11

6.2 MODULE IS EASY TO DAMAGE..................................................................................................................................... 11

6.3 BER (BIT ERROR RATE)IS HIGH................................................................................................................................. 11

REVISION HISTORY............................................................................................................................................................................... 12

ABOUT US................................................................................................................................................................................................ 12

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual

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, Please visit www.ebyte.com

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual

1.Overview

1.1 Introduction

The E78 series products are radio frequency transceiver modules with

multiple frequency bands designed and produced by Ebyte, with long

communication distance and extremely low current consumption in low

power consumption mode. This module is a small-volume patch type (pin

spacing 1.1mm).

The E78 series products use ASR's ASR6505 chip, which is a single-chip

SoC integrated with ultra-low power LoRa, using Semtech's advanced

low-power LoRa Transceiver SX1262, and integrates a STM8L152 low-power MCU, Flash capacity 64kB, SRAM

Capacity 4kB, EEPROM capacity 2K, small size, ultra-low power consumption, support LoRaWAN, LinkWAN

multiple protocol standards, suitable for a variety of Internet of Things application scenarios, is currently the best

choice for LPWAN application chips.

The E78 series products are hardware platforms and cannot be used independently. Users need to carry out

secondary development. (We can customize standard LoRaWan and Ali linkWan nodes)

Features:

Under ideal test conditions, the communication distance can reach 5.5km;

The maximum transmit power is 22dBm, and the software is multi-level adjustable;

Support license-free ISM 868/915MHz frequency band;

Support multiple modulation modes (GFSK Mode, LoRa);

Support 1.8～3.7V power supply, power supply greater than 3.3V can guarantee the best performance;

Industrial standard design, supporting long-term use at -40～+85℃;

Dual antennas are optional (IPX/PCB), which is convenient for users to develop and integrate;

Based on the ASR6505 chip development, users can directly use it for secondary development.

Applications:

Smart home and industrial sensors, etc.;

Security system, positioning system;

Wireless remote control, UAV;

Wireless game remote control;

Healthcare products;

Wireless voice, wireless headset;

Automotive industry applications.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual

2 Parameters

2.1 Limit Parameters:

Main Parameters

Value

Notice

Min.

Max.

Power supply voltage (V)

3.9

Over 3.9V will permanently burn the module

Blocking power (dBm)

The probability of burning is small when used at

close range

Working temperature (℃)

-40

+85

Industrial grade

2.2 Operating Parameters:

Main Parameters

Value

Notice

Min.

Typical

Max.

Working voltage (V)

1.8

3.3

3.7

≥3.3V can guarantee output power

Communication level (V)

3.3

Using 5V TTL is risky to burn

Working temperature (℃)

-40

+85

Industrial design

Working frequency (MHz)

850

868/915

925

Support ISM frequency band

Power

Emission current (mA)

145

Instantaneous power consumption

Receiving current (mA)

Sleep current (μA)

2.0

Software shutdown

Maximum transmit power (dBm)

21.5

Receiving sensitivity (dBm)

-122

-123

-126

The air rate is 595kbps

Air rate

LoRa（bps）

62.5K

User programmable customization

GFSK（bps）

300K

User programmable customization

Parameters

Value

Notice

Ideal Range

5500m

At Max TX power and 2.4kbps air rate, Two modules in a line of

sight, clear weather, with 5dbi antennas at 2.5meters.

Crystal frequency

32MHz

TXCO

Modulation

LoRa(recommended)

GFSK ，LoRa

Encapsulation method

SMA

Interface method

Stamp-hole

Diameter 1.1mm

Dimensions

26*16mm

RF interface

IPEX/stamp-hole

Equivalent impedance is about 50Ω

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual

Hardware Notice:

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 beneficial for long-term stable operation;；

The current required for the moment of launch is large but often because the launch time is extremely

short, the total energy consumed may be smaller;

When the customer uses an external antenna, the impedance matching degree between the antenna and

the module at different frequency points will affect the magnitude of the emission 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；

When the customer uses an external antenna, the impedance matching degree between the antenna and

the module at different frequency points will affect the magnitude of the emission current to varying

degrees；

The shutdown current is often much smaller than the current consumed by the power supply part of the

whole machine at no load, without excessive demand;

Due to the inherent error of the material itself, a single LRC component has an error of ±0.1%, but

hesitant to use multiple LRC components in the entire RF loop, there will be accumulation of errors,

resulting in differences in the emission current and the receiving current of different modules；

Reducing the transmit power can reduce power consumption to a certain extent, but reducing the transmit

power transmission for many reasons will reduce the efficiency of the internal PA.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual

3. Size and Pin definition

3.1 Size and Pin definition

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual

3.2 Pin definition

No.

Name

Direction

Function

GND

Ground wire, connected to the power reference ground

LCD-SEG10

Input/Output

MCU GPIO

LCD-SEG11

Input/Output

MCU GPIO

LCD-SEG12

Input/Output

MCU GPIO

LCD-SEG13

Input/Output

MCU GPIO

LCD-SEG14

Input/Output

MCU GPIO

LCD-SEG15

Input/Output

MCU GPIO

LCD-SEG16

Input/Output

MCU GPIO

LCD-SEG17

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 selection pin, external SPI can be selected

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

Programming pin

NRST

Input

External reset pin

LCD-COM0

Input/Output

MCU GPIO

LCD-COM1

Input/Output

MCU GPIO

LCD-COM2

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

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual

LCD-SEG0

Input/Output

MCU GPIO

GND

Ground wire, connected to the power reference ground

LCD-SEG3

Input/Output

MCU GPIO

LCD-COM3

Input/Output

MCU GPIO

LCD-SEG4

Input/Output

MCU GPIO

LCD-SEG5

Input/Output

MCU GPIO

UART0-RX

Input

UART0-RX pin

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 1.8V~3.7V (recommend to add ceramic filter capacitor)

GND

Ground wire, connected to the power reference ground

For more information about module pin definition, software driver and communication protocol, please see ASR6505 Datasheet

4 Hardware and Software Guide

4.1 Hardware Design

It is recommended to use a DC stabilized power supply to supply power to the module, and the power ripple

coefficient should be as small as possible, and the module should be reliably grounded;

Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse

connection may cause permanent damage to the module;

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;

When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the

margin, and the whole machine is conducive to long-term stable operation;

The module should be as far away as possible from the power supply, transformer, high-frequency wiring and other

parts with large electromagnetic interference;

High-frequency digital wiring, high-frequency analog wiring, and power wiring must avoid the bottom of the

module. If it is necessary to pass under the module, assume that the module is soldered to the Top Layer, and the top

layer of the contact part of the module is covered with copper (all copper And well grounded), it must be close to

the digital part of the module and routed in the Bottom Layer;

Assuming that the module is soldered or placed on the Top Layer, it is also wrong to randomly route the wires on

the Bottom Layer or other layers, which will affect the stray and receiving sensitivity of the module to varying

degrees;

Assuming that there are devices with large electromagnetic interference around the module, it will greatly affect the

performance of the module. According to the intensity of the interference, it is recommended to stay away from the

module. If the situation permits, proper isolation and shielding can be done;

Assuming that there are traces with large electromagnetic interference around the module (high-frequency digital,

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual

high-frequency analog, power wiring), it will also greatly affect the performance of the module. According to the

intensity of the interference, it is recommended to stay away from the module. Isolation and shielding;

If the communication line uses 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is

still a risk of damage);

Try to stay away from part of the physical layer that is also 2.4GHz TTL protocol, for example: USB3.0;

The antenna installation structure has a great impact on the performance of the module. Make sure that the antenna

is exposed, preferably vertically upward. When the module is installed inside the case, a high-quality antenna

extension cable can be used to extend the antenna to the outside of the case;

The antenna must not be installed inside the metal shell, which will greatly reduce the transmission distance.

4.1 Software Writing

This module is SX1262+STM8L152 integrated, and its driving method is completely equivalent to SX1262, and users can

operate according to SX1262 or ASR6505 chip book;

At the same time, please refer to the E78-900M22S1A and E78-900TBL-01A pin corresponding STM8 data provided by our

company during the secondary development.

The voltage range of the active crystal oscillator is 1.8V to 3V. 2.2V is recommended. 3.3V may be damaged.

4 Programming Diagram and Guide

4.1 E78-900M22S1A burning interface

Connect the module pins 30 and 31, and use ST-LINK or STM8 debugging tools to download the program.

For secondary development, you are recommended to use test kit E78-900TBL-01A. It is convenient and efficient. First,

power the module through the serial port of the test kit, and then connect the NRST pin and SWIM pin of ST-LINK to

the test kit to download the program. As shown above.

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