Ebyte E28-2G4M12S User Manual

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Ebyte E28-2G4M12S User Manual Manual pdf 6 page image

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M12S User ManualCopyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 54.Basic operation4.1 Hardware design It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small as possible, andthe module needs to be reliably grounded.； Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverseconnection may cause permanent damage to the module； Please check the power supply to ensure it is within the recommended voltage otherwise when it exceeds themaximu m value the module will be permanently damaged； Please check the stability of the power supply, the voltage can not be fluctuated 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 otherparts with large electromagnetic interference.； 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 isspread on the Top Layer of the module contact part(well grounded), it must be close to the digital part of the moduleand 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 Layeror 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 affe ctthe 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 stayaway from the module according to the strength of the interference.If necessary, appropriate isolation and shieldingcan be done. If the communication line uses a 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there isstill a risk of damage)； 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 ensurethat the antenna is exposed, preferably vertically upward. When the module is mounted inside the case, use a goodantenna 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 greatlyweakened.4.2 Software editing This module is based on SX1280,same drive way as SX1280,user can refer to SX1280 datasheet. DIO is general I/O port，see more in SX1280 datasheet. GDO 2 is generally configurated as IRQ function, IRQ pin can also be disconnected. The SPI query mode can be used