Ebyte E78-400M22S User manual

E78-400M22S User Manual

ASR6501 433/470MHz 22dBm LoRa Wireless Module

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

Content

1.Overview............................................................................................................................................................................. 2

1.1 Introduction.............................................................................................................................................................. 2

1.2 Features.....................................................................................................................................................................2

1.3 Application............................................................................................................................................................... 2

2. Specification and parameter............................................................................................................................................... 3

2.1 Limit parameter........................................................................................................................................................ 3

2.2 Operating parameter................................................................................................................................................. 3

3. Size and pin definition........................................................................................................................................................4

4.Development........................................................................................................................................................................5

6.Basic operation.................................................................................................................................................................... 6

6.1 Hardware design....................................................................................................................................................... 6

7.FAQ..................................................................................................................................................................................... 7

7.1 Communication range is too short............................................................................................................................7

7.2 Module is easy to damage........................................................................................................................................ 7

7.3 BER(Bit Error Rate) is high..................................................................................................................................... 7

8. Production guidance........................................................................................................................................................... 8

8.1 Reflow soldering temperature.................................................................................................................................. 8

8.2 Reflow soldering curve.............................................................................................................................................8

9. Antenna recommendation...................................................................................................................................................9

10. Package for batch order..................................................................................................................................................10

Revision history....................................................................................................................................................................10

About us...............................................................................................................................................................................10

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

1.Overview

1.1 Introduction

E78-400M22S is a SoC LoRa RF module designed by Ebyte, working at

410 ~ 493MHz (default is 433MHz) with max transmitting power of 22dBm.

With ASR company's ASR6501 chip, which is an ultra-low power LoRa

integrated single chip SoC, Semtech advanced low power LoRa Transceiver

SX1262, and integrated a Cypress 32-bit cor-m0 + low power MCU, Flash

capacity 128kB, SRAM capacity 16kB, ultra-small size, ultra-low power, the

module supports LoRaWAN, LinkWAN protocol standards, suitable for a variety of Internet of things application

scenarios. It is currently the best choice for LPWAN application chips.

E78-400M22S is a hardware platform and cannot be used directly. Users need to conduct secondary development

(Ebyte can customize standard LoRaWan and Alibaba linkWan nodes for you).

1.2 Features

Ultra-small size, only 14x20mm;

Under ideal conditions, the communication distance can reach 7km;

Integrated Cypress 32-bit cortex-m0 + low-power MCU;

Maximum transmission power 160mW, multi-stage adjustable software;

Support global license-free ISM 433/470mhz frequency band;

Support ultra-low power consumption, very low power consumption;

In LoRa mode, data transmission rate of 0.018k ~ 62.5kbps is supported.

Supports data transmission rate up to 300kbps in FSK mode;

New SF5 spread spectrum factor to support dense networks;

Industry-standard design, support - 40 ~ + 85 ℃ under long time use;

Dual antenna is optional (IPEX/ stamp hole), which is convenient for users' secondary development and convenient

for integration.

1.3 Application

Smart home and industrial sensors;

Security system, positioning system;

Building automation solutions;

Wireless remote control, UAV;

Wireless game remote control;

Healthcare products;

Wireless voice, wireless headphones;

Advanced meter reading architecture (AMI);

Automotive applications.

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

2. Specification and parameter

2.1 Limit parameter

Main parameter

Performance

Remark

Min.

Max.

Power supply（V）

3.7

Voltage over 5.2V will cause permanent

damage to module

Blocking power（dBm）

Chances of burn is slim when modules

are used in short distance

Operating temperature（℃）

-40

+85

2.2 Operating parameter

Main parameter

Performance

Remark

Min

Typ.

Max.

Operating voltage（V）

2.5

3.3

3.7

≥3.3 V ensures output power

Communication level（V）

3.3

For 5V TTL, it may be at risk of

burning down

Operating temperature（℃）

-40

+85

Industrial design

Operating frequency（MHz）

410

493

Support ISM band

Power

consumption

Transmitting current

[mA]

115

Instant power consumption

Receiving current [mA]

Turn-off current [μA]

2.5

Software is shut down

Max Tx power（dBm）

20.5

21.5

Receiving sensitivity（dBm）

-139

-140

Air data rate is 0.018kbps

Air data rate（bps）

0.018k

62.5k

Lora

0.6

300

GFSK

Main parameter

Description

Remark

Distance for reference

7000m

Test condition：clear and open area, antenna gain: 5dBi，

antenna height: 2.5m，air data rate: 1kbps

Crystal frequency

32MHz

Active temperature complementary crystal vibration

Modulation

LoRa™

Package

SMD

Connector

1.27mm

Stamp hole

Size

14 * 20mm

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

Antenna

IPEX/Stamp hole

50 ohm impedance

ASR6501

FLASH

128KB

RAM

16KB

Core

Cortex-M0

3. Size and pin definition

No.

Name

Direction

Function

GND

Ground wire, connected to the power reference ground

VCC

Power supply, range 2.5-3.7v (external ceramic filter capacitor is

recommended)

SETB

Input/output

Ground wire, connected to the power reference ground

DIO1

Input/output

Multipurpose digital IO cannot be used as external GPIO

BUSY

Input/output

SPI busy indicator that cannot be used as an external GPIO

I2C_SDA

Input/output

I2C SCL pins

I2C_SCL

Input/output

I2C SDA pin

UART_CTS

Input/output

UART CTS pin

UART_RTS

Input/output

UART RTS pin

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

GND

Ground wire, connected to the power reference ground

ANT

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

XRES

Input

External reset pins

ADC_IN

Input

ADC input pin

AUX

Input/output

MCU GPIO

SETA

Input/output

MCU GPIO

UART_RX

Input/output

UART RX pin

UART_TX

Input/output

UART TX pin

SWD_DATA

Input/output

SWD Data pins

SWD_CLK

Input/output

SWD Clock pin

GND

Ground wire, connected to the power reference ground

SPI_MISO

Input/output

SPI MISO test point, internally connected, cannot be used as external SPI

SPI_NSS

Input/output

SPI NSS test point, internally connected, cannot be used as an external SPI

SPI_MOSI

Input/output

SPI MOSI test point, internally connected, cannot be used as an external SPI

SPI_SCK

Input/output

SPI SCK test point, internally connected, cannot be used as external SPI

4.Development

No.

Key word

Remark

Burn the

connection

Module is SoC module, with GPIO port, program download using ASR official test board;

Burn the

connection

Connect XRES, SWD_CLK, SWD_DATA, GND, 3V3 of the test board on the official website with

XRES, SCLK, SDAT, GND and 3V3 of the downloader respectively, and ensure that both green lights

are on before downloading. If there is any exception, please press this button to ensure that both green

lights are on. (for details, please refer to the official ASR6501 burning instructions)

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

The test suite

It is suggested that we can first use our testing base e78-tbl-01 specially made for E78 module, which

is convenient for users to use, and users can decide according to their own needs.

6.Basic operation

6.1 Hardware design

It is recommended to use dc stabilized voltage power supply to supply power to this module. The ripple coefficient

of the power supply should be as small as possible and the module should be grounded reliably.

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

Please check the power supply to ensure that it is between the recommended power supply voltage. If the maximum

value is exceeded, the module will be permanently damaged.

Please check the stability of the power supply, the voltage cannot fluctuate greatly and frequently;

When designing power supply circuit for modules, it is often recommended to keep more than 30% allowance,

which is conducive to long-term stable work of the whole machine.

Module should be as far as possible away from the power supply, transformers, high frequency wiring and other

electromagnetic interference large part;

High frequency digital wiring, high frequency analog wiring and power supply wiring must avoid the Bottom of the

module. If it is really necessary to pass the Bottom of the module, assume that the module is welded to the Top

Layer and copper is laid on the Top Layer in the contact part of the module (all copper is laid and well grounded). It

must be close to the digital part of the module and wired on the Bottom Layer.

Assuming that the module is welded or placed in Top Layer, it is also wrong to randomly line Bottom Layer or other

layers, which will affect the spurious and receiving sensitivity of the module to varying degrees.

It is assumed that there are devices with large electromagnetic interference around the module, which will greatly

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

the module appropriately. If possible, appropriate isolation and shielding can be done.

It is assumed that the wiring around the module with large electromagnetic interference (high frequency digital,

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

the intensity of interference, it is suggested to stay away from the module. If possible, appropriate isolation and

shielding can be done.

If 5V level is used for communication line, 1k-5.1k resistance must be connected in series (not recommended, there

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

is still risk of damage);

As far as possible away from some physical layer also 2.4GHz TTL protocol, such as: USB3.0;

Antenna installation structure has a great impact on the performance of the module, it must be ensured that the

antenna is exposed and preferably vertical;

When the module is installed inside the housing, a high-quality antenna extension cord can be used to extend the

antenna to the outside of the housing.

The antenna must not be installed in the inner part of the metal shell, which will greatly weaken the transmission

distance.

7.FAQ

7.1 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.

7.2 Module is easy to damage

Please check the power supply source, ensure it is 2.0V~3.6V, voltage higher than 3.6V 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.

7.3 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;

Poor power supply may cause messy code. Make sure that the power supply is reliable.

The extension line and feeder quality are poor or too long, so the bit error rate is high;

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

8. Production guidance

8.1 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)

Mx 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℃

Average 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

8.2 Reflow soldering curve

Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual

9. Antenna recommendation

The antenna is an important role in the communication process. A good antenna can largely improve the

communication system. Therefore, we recommend some antennas for wireless modules with excellent performance and

reasonable price.

Model No.

Type

Frequency

Interface

Gain

dBi

Height

Cable

Function Feature

TX433-NP-4310

Soft PCB

antenna

433M

SMA-J

43.8*9.5mm

Soft inside，FPC soft antenna

TX433-JW-5

Rubber antenna

433M

SMA-J

50mm

Flexible &omnidirectional

TX433-JWG-7

Rubber antenna

433M

SMA-J

2.5

75mm

Flexible &omnidirectional

TX433-JK-20

Rubber antenna

433M

SMA-J

210mm

Flexible &omnidirectional

TX433-JK-11

Rubber antenna

433M

SMA-J

2.5

110mm

Flexible &omnidirectional

TX433-XP-200

Sucker antenna

433M

SMA-J

19cm

200cm

Sucker antenna, High gain

TX433-XP-100

Sucker antenna

433M

SMA-J

3.5

18.5cm

100cm

Sucker antenna, High gain

TX433-XPH-300

Sucker antenna

433M

SMA-J

96.5cm

300cm

Car Sucker antenna, High

gain

TX433-JZG-6

Rubber antenna

433M

SMA-J

2.5

52mm

Short straight &omnidirectional

TX433-JZ-5

Rubber antenna

433M

SMA-J

52mm

Short straight &omnidirectional

TX490-XPL-100

Sucker antenna

490M

SMA-J

3.5

12cm

100cm

Sucker antenna, High gain

TX490-JZ-5

Rubber antenna

490M

SMA-J

50mm

Short straight &omnidirectional

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