Hardware Design - Ebyte E28-2G4T27SX User Manual

Chengdu Ebyte Electronic Technology Co.,Ltd.
8.

Hardware design

It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small as possible,
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and the module needs to be reliably grounded.；
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Please pay attention to the correct connection of the positive and negative poles of the power supply.
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Reverse connection may cause permanent damage to the module；
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Please check the power supply to ensure it is within the recommended voltage otherwise when it exceeds the
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maximum value the module will be permanently damaged；
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Please check the stability of the power supply, the voltage can not be fluctuated frequently；
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When designing the power supply circuit for the module, it is often recommended to reserve more than 30%
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of the margin, so the whole machine is beneficial for long-term stable operation；
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The module should be as far away as possible from the power supply, transformers, high-frequency wiring
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and other parts with large electromagnetic interference；
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High-frequency digital routing, high-frequency analog routing, and power routing must be avoided under
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the module. If it is necessary to pass through the module, assume that the module is soldered to the Top
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Layer, and the copper is spread on the Top Layer of the module contact part(well grounded), it must be close
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to the digital part of the module and routed in the Bottom Layer；
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Assuming the module is soldered or placed over the Top Layer, it is wrong to randomly route over the
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Bottom Layer or other layers, which will affect the module's spurs and receiving sensitivity to varying
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degrees；
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It is assumed that there are devices with large electromagnetic interference around the module that will
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greatly affect the performance. It is recommended to keep them away from the module according to the
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strength of the interference. If necessary, appropriate isolation and shielding can be done；
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Assume that there are traces with large electromagnetic interference (high-frequency digital, high-frequency
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analog, power traces) around the module that will greatly affect the performance of the module. It is
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recommended to stay away from the module according to the strength of the interference.If necessary,
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appropriate isolation and shielding can be done.
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If the communication line uses a 5V level, a 1k-5.1k resistor must be connected in series (not recommended,
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there is still a risk of damage)；
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Try to stay away from some physical layers such as TTL protocol at 2.4GHz , for example: USB3.0；
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The mounting structure of antenna has a great influence on the performance of the module. It is necessary to
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ensure that the antenna is exposed, preferably vertically upward. When the module is mounted inside the
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case, use a good antenna extension cable to extend the antenna to the outside；
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The antenna must not be installed inside the metal case, which will cause the transmission distance to be
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greatly weakened.
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E28-2G4T27SX User Manual
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