EBYTE E32-900M30S 915MHz SPI Wireless Module Instruction Manual

EBYTE E32-900M30S 915MHz SPI Wireless Module

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Features

• The measured communication distance can reach 10km;
• Maximum transmission power of 1W, software multi-level adjustable;
• Support 868/915 MHz band;
• Support data transmission rate between 0.018K and 37.5Kbps in LoRaTM mode;
• Support data transmission rate of up to 300kbps in FSK mode;
• Support for multiple modulation mode, LoRaTM/FSK/GFSK/MSK/GMSK/OOK;
• Large FIFO capacity, support 256Byte data cache;
• Support 3.3V~5.5V power supply, power supply over 5 V can guarantee the best performance;
• Industrial grade standard design, support -40 ~ 85 °C for working over a long time;
• IPEX and stamp hole optional, good for secondary development and integration.

Introduction

Brief Introduction

E32-900M30s is a self-developed, 868/915MHz LoRaTM SMD wireless module with the maximum transmission power of 1W which is based on the SX1276 produced by Semtech in the United States.

Due to adopt the original installation import SX1276 as the core module, on the basis of the original with built-in power amplifier (PA) and low noise amplifier (LNA), for achieving maximum transmitted power of 1W at the same time receiving sensitivity for further ascension, also on the overall stability of communication is no power amplifier with low noise amplifier products significantly increase. Due to its advanced LoRaTM modulation technology, its anti-interference performance and communication distance are far superior to the current FSK and GFSK modulation products. This module is mainly aimed at intelligent home, wireless meter reading, scientific research and medical treatment, and medium and long distance wireless communication equipment. As the RF performance and component selection are in accordance with industrial standards, and the product has obtained FCC, CE, RoHS and other international authoritative certification reports.
Since this module is a pure RF transceiver module, it needs to be programmed by using MCU drive or special SPI debugging tools.

Application

• Home security alarm and remote keyless entry;
• Smart home and industrial sensors;
• Wireless alarm security system;
• Building automation solutions;
• Wireless industrial-grade remote control;
• Health care products;
• Advanced Meter Reading Architecture(AMI);

Specification and parameter

Limit parameter

to module
Blocking power（dBm）| –| 10| Chances of burn is slim when modules are used in short distance
Operating temperature（℃）| -40| 85| Industrial grade

Operating parameter

5dBi，  antenna height: 2m，air data rate: 2.4kbps
FIFO| 256Byte| Maximum length of single send
Crystal Oscillator| 32MHz| Passive crystals
Protocol| LoRaTM| FSK/GFSK/MSK/GMSK/OOK
Package| SMD| Spacing of 2.54 mm
Interface| 2.54mm| Sample hole
Communication interface| SPI| 0~10Mbps
Size| 24 * 38.5 mm| –
Antenna| Sample hole / IPEX| 50 ohm impedance

Size and pin definition

high level effective
7| TXEN| Input| RF switch receiving control pin, connected to external MCU IO, high level effective
8| DIO2| Input/Output| General IO port (see SX1276 manual for details)
9| VCC| –| Power supply, range 3.3 ~ 5.5V (external ceramic filter capacitor is recommended)
10| VCC| –| Power supply, range 3.3 ~ 5.5V (external ceramic filter capacitor is recommended)
11| GND| –| Ground
12| GND| –| Ground
13| NC| –| Suspend
14| DIO3| Input/Output| General IO port (see SX1276 manual for details)
15| DIO4| Input/Output| General IO port (see SX1276 manual for details)
16| DIO5| Input/Output| General IO port (see SX1276 manual for details)
17| GND| –| Ground
18| GND| –| Ground
19| DIO1| Input/Output| General IO port (see SX1276 manual for details)
20| DIO0| Input/Output| General IO port (see SX1276 manual for details)
21| NRST| Input| Chip reset trigger input pin
22| MISO| Output| SPI data output pin
23| MOSI| Input| SPI data output pin
24| SCLK| Input| SPI data output pin
25| NSS| Input| the module chip selects the pin used to start an SPI communication
26| GND| –| Ground
27| ANT| –| Antenna interface, Sample hole (50Ω characteristic impedance)
28| GND| –| Ground

Basic operation

Hardware design

• It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small as possible and the module needs to 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 between the recommended supply voltage, if exceeding the maximum, the module will be permanently damaged;
• Please check the stability of the power supply. Voltage can not fluctuate greatly and frequently;
• When designing the power supply circuit for the module, it is often recommended to  reserve more than 30% of themargin, so the whole machine is beneficial for long-term stable operation;
• The module should be as far away as possible from the power supply, transformers, high-frequency wiring and other parts with large electromagnetic interference;
• Bottom Layer High-frequency digital routing, high-frequency analog routing, and power routing must be avoided under the module. If it is necessary to pass through the module, assume that the module is soldered to the Top Layer, and the copper is spread on the Top Layer of the module contact part(well grounded), it must be close to the digital part of the module and routed in the Bottom Layer;
• Assuming the module is soldered or placed over the Top Layer, it is wrong to randomly route over the Bottom Layer or other layers, which will affect the module’s spurs and receiving sensitivity to varying degrees;
• It is assumed that there are devices with large electromagnetic interference around the module that will greatly affect the performance. It is recommended to keep them away from the module according to the strength of the interference. If necessary, appropriate isolation and shielding can be done;
• Assume that there are traces with large electromagnetic interference (high- frequency digital, high-frequency analog,power traces) around the module that will greatly affect the performance of the module. It is recommended to stay away from the module according to the strength of the interference.If necessary, appropriate isolation and shielding can be done;
• Try to stay away from some physical layers such as TTL protocol at 2.4GHz , for example: USB3.0;
• The mounting structure of antenna has a great influence on the performance of the module. It is necessary to ensure that the antenna is exposed, preferably vertically upward. When the module is mounted inside the case, use a good antenna extension cable to extend the antenna to the outside;
• The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly weakened.

Programming

• The core of this module is SX1278/SX1276+PA+LNA, its driving method is completely equivalent to SX1278/SX1276, the user can operate according to the SX1278/SX1276 chip manual
• DIO0, DIO1, DIO2, DIO3, DIO4 and DIO5 are general I/O ports, which can be configured into a variety of functions. See SX1278 manual for details. If not used can be suspended;
• NRST, TXEN and RXEN pins must be connected, wherein NRST controls the reset of the chip, TXEN and RXEN pins control the RF switch;
• Pay attention to good grounding, large area of ground, small ripple of power supply, filter capacitor should be added and close to module VCC and GND pins as far as possible;
• SPI communication rate should not be set too high, usually 1Mbps is recommended;
• When transmitting, set DIO_7 pin to high level and DIO_13, DIO_14 pins to low level;When receiving, set DIO_7 pin to low level and DIO_13, DIO_14 pins to high level;Before turning off, set DIO_7, DIO_13, DIO_14 pins to low;
• The register configuration can be reinitialized when the chip is idle for greater stability.

Basic application

Hardware design and circuit schematic diagram

Production guidance

Reflow soldering temperature

Reflow soldering curve

E32 series

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| Gain| Hright| Cable| Interface| Function feature
---|---|---|---|---|---|---|---
Hz| dBi| mm| cm
TX915-JZ-5| Rubber antenna| 915M| 2.0| 50| –| SMA-J| Short straight &omnidirectional
TX915-JK-11| Rubber antenna| 915M| 2.5| 110| –| SMA-J| Flexible &omnidirectional
TX915-JK-20| Rubber antenna| 915M| 3.0| 200| –| SMA-J| Flexible &omnidirectional
TX915-XPL-100| Sucker antenna| 915M| 3.5| 290| 100| SMA-J| High gain

Revision history

Version

| Date| Description| Issued by
---|---|---|---
1.0| 2021-5-07| Initial version|

Linson

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FAQ

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.

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.

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;
– SPI clock waveform is not standard, check whether there is interference on the SPI line, SPI bus wiring should not be too long;
– 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.

References

• 串口服务器_数传电台_4G DTU_遥控开关_LoRa/ZigBee/WiFi/蓝牙模块-成都亿佰特电子科技有限公司官网

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