background image

Chengdu Ebyte Electronic Technology Co., Ltd.

E22-400M22S User manual

Copyright ©2012–2018,Chengdu Ebyte Electronic Technology Co.,Ltd.

7

The module should be as far away as possible from the power supply, transformers, high-frequency wiring and other
parts with large electromagnetic interference.

High-frequency digital traces, high-frequency analog traces, and power traces 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(All copper-covered and well grounded), and must be close to
the digital part of the module and routed in the Bottom Layer.

Assuming the module is soldered or placed in the Top Layer, it is also wrong to randomly route the Bottom Layer or
other layers, which will affect the module's spurs and receiving sensitivity to varying degrees.

Assume that there are traces with large electromagnetic interference around the module (high-frequency digital,
high-frequency analog, power trace), which 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;

If the communication line uses a 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 some physical layers and also have a 2.4GHz TTL protocol, for example: USB3.0

The antenna mounting structure 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 of the case.

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

It is recommended to add a 200R protection resistor to the RXD/TXD of the external MCU.

4.2 Software Programming

Its driving mode is exactly the same as SX1268/SX1262. Users can operate according to SX1268/SX1262 chip
datasheet.

DIO1 and DIO2 are general-purpose IO ports, which can be configured into multiple functions. DIO2 can be
connected to TXEN and not connected to the MCU's IO port. It can be used to control the RF switch transmission.
If not used, you can hang it. For details, see the SX1262 manual.

DIO 3 is used to supply 32 MHz TCXO crystal oscillator.

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).

When the power supply at room temperature is lower than the recommended low voltage, the lower the voltage is,
the lower the transmitting power is.

Due to antenna quality or poor matching between antenna and module.

Содержание E22-400M22S

Страница 1: ...E22 400M22S User Manual SX1268 433 470MHz SPI SMD LoRa Module...

Страница 2: ...RAMETER 3 2 2 OPERATING PARAMETER 3 3 SIZE AND PIN DEFINITION 4 4 BASIC OPERATION 6 4 1 HARDWARE DESIGN 6 4 2 SOFTWARE PROGRAMMING 7 5 FAQ 7 5 1 COMMUNICATION RANGE IS TOO SHORT 7 5 2 MODULE IS EASY T...

Страница 3: ...dance with industrial grade standards and this products obtained FCC CE and RoHS certification already and so users do not need to worry about the performance Adopted industrial grade high precision 3...

Страница 4: ...manent damage to module Blocking power dBm 10 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...

Страница 5: ...tance for reference 7000m Test condition clear and open area antenna gain 5dBi antenna height 2 5m air data rate 0 3kbps FIFO 256Byte Maximum length of single transmission Crystal frequency 32MHz Modu...

Страница 6: ...igurable universal IO port see SX1262 manual for details 9 VCC Output Power supply 1 8V 3 7V it is recommended to add external ceramic filter capacitor 10 GND Ground 11 GND Ground 12 GND Ground 13 DIO...

Страница 7: ...itor should be increased and as close as possible to the VCC and GND pins of module Note It is recommended to use DC stabilized power supply to supply power to the module The power supply ripple coeff...

Страница 8: ...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 th...

Страница 9: ...whether there is interference on the SPI line The SPI bus line should not be too long Unsatisfactory power supply may also cause garbled characters and ensure the reliability of the power supply If th...

Страница 10: ...it power dBm Test distance km Air Data rate Packaging Size mm E22 900T22S SX1262 868M 915M 22 7 SMD 16 26 UART E22 230T22S SX1262 230M 22 7 SMD 16 26 UART E22 400T22S SX1268 433M 470M 22 7 SMD 16 26 U...

Страница 11: ...na TX433 JW 5 Rubber antenna 433M SMA J 2 50mm Flexible Omnidirectional TX433 JWG 7 Rubber antenna 433M SMA J 2 5 75mm Flexible Omnidirectional TX433 JK 20 Rubber antenna 433M SMA J 3 210mm Flexible O...

Страница 12: ...n Date Description Issued by 1 0 2018 9 18 Original version huaa 1 1 2019 2 17 Content added Ray 1 2 2019 04 03 Content updated Ray 1 3 2019 11 14 Ren About us Website www ebyte com Sales info cdebyte...

Отзывы: