Ebyte E52-400/900NW22S User Manual page 34

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Ⅹ. Hardware Design
It is recommended to use a DC regulated power supply to power the module. The power ripple coefficient should be
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as small as possible, and the module must be reliably grounded;
Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse
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connection may cause permanent damage to the module;
Please check the power supply to ensure that it is within the recommended power supply voltage. If it exceeds the
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maximum value, it will cause permanent damage to the module;
Please check the stability of the power supply. The voltage cannot fluctuate greatly and frequently;
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When designing the power supply circuit for the module, it is often recommended to reserve more than 30% margin,
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so that the whole machine can work stably for a long time;
The module should be kept as far away as possible from power supplies, transformers, high-frequency wiring and
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other parts with high electromagnetic interference;
High-frequency digital traces, high-frequency analog traces, and power traces must be avoided under the module. If
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it is absolutely necessary to pass under the module, assume that the module is welded on the Top Layer, and ground
copper is laid on the Top Layer of the module contact part (all paved Copper and well grounded), must be close to
the digital part of the module and routed on the Bottom Layer;
Assuming that the module is welded or placed on the Top Layer, it is also wrong to route traces randomly on the
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Bottom Layer or other layers, which will affect the spuriousness and receiving sensitivity of the module to varying
degrees;
Assuming that there are devices with large electromagnetic interference around the module that will greatly affect
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the performance of the module. It is recommended to stay away from the module according to the intensity of the
interference. If the situation allows, appropriate isolation and shielding can be done;
Assuming that there are traces with large electromagnetic interference around the module (high-frequency digital,
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high-frequency analog, power traces), which will also greatly affect the performance of the module. According to
the intensity of the interference, it is recommended to stay away from the module appropriately. This can be done if
the situation allows Proper isolation and shielding;
If the communication line uses 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is
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still a risk of damage);
Try to stay away from some TTL protocols whose physical layer is also 2.4GHz, such as USB3.0;
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The antenna installation structure has a great impact on module performance. Make sure the antenna is exposed and
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preferably vertically upward;
When the module is installed inside the casing, you can use a high-quality antenna extension cable to extend the
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antenna to the outside of the casing;
The antenna must not be installed inside a metal shell, as this will greatly reduce the transmission distance.
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E52-400/900NW22S User Manual