Hardware Notice - Ebyte E104-BT5040U User Manual

Chengdu Ebyte Electronic Technology Co., Ltd.

5. Hardware Notice

5.1 Hardware Notice
It is recommended to use a DC stabilized power supply to supply power to the module, and the power ripple coefficient is as
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small as possible, and the module needs to be grounded reliably;
Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse connection may
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cause permanent damage to the module;
Please check the power supply to ensure that it is within the recommended supply voltage. If it exceeds Max, it will cause
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permanent damage to the module;
Please check the stability of the power supply, the voltage should not 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% of the margin, and
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the whole machine is conducive to long-term stable operation;
The module should be as far away as possible from the power supply, transformer, high-frequency wiring and other parts with
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large electromagnetic interference;
High-frequency digital wiring, high-frequency analog wiring, and power wiring must avoid the bottom of the module. If it is
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necessary to pass under the module, assume that the module is soldered to the Top Layer, and the top layer of the contact part of the
module is covered with copper (all copper And well grounded), it must be close to the digital part of the module and routed in the
Bottom Layer;
Assuming that the module is soldered or placed on the Top Layer, it is also wrong to randomly route the wires on the Bottom
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Layer or other layers, which will affect the stray and receiving sensitivity of the module to varying degrees;
Assuming that there are components with large electromagnetic interference around the module, it will greatly affect the value of
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the module. According to the intensity of the interference, it is recommended to stay away from the module. If the situation permits,
proper 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 wiring), it will greatly affect the value of the module. According to the intensity of the interference, it is
recommended to stay away from the module. Isolation and shielding;
If the communication line uses 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is still a risk of
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damage);
Try to stay away from part of the physical layer that is also 2.4GHz TTL protocol, for example: USB3.0;
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The antenna installation structure has a great influence on the value of the module. Make sure that the antenna is exposed,
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preferably vertically upward. When the module is installed inside the case, a high-quality antenna extension cable can be used to
extend the antenna to the outside of the case;
The antenna must not be installed inside the metal shell, which will greatly reduce the transmission distance.
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It is recommended to add a 200R protection resistor to the RXD/TXD of the external MCU.
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E104-BT5040U Datasheet