Basic Operation; Hardware Design; Software Programming - Ebyte E76-433M20S User Manual

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4. Basic Operation

4.1 Hardware Design

It is recommended to use DC stabilized power supply to supply power to the module. The power supply ripple

coefficient is as small as possible, and the module needs to be reliably grounded.
Please pay attention to the correct connection of the positive and negative poles of the power supply. If the reverse

connection is connected, the module may be permanently damaged.
Please check the power supply to ensure that between the recommended supply voltage, if exceeding the maximum,

the module will be permanently damaged.
Please check the stability of the power supply, the voltage can not be significantly frequent.
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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 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 other
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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.
Assuming that there are devices with large electromagnetic interference around the module, the performance of the

module will also be greatly affected. According to the intensity of the interference, it is suggested to stay away from
the module appropriately. If circumstances permit, appropriate isolation and shielding can be done.
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.
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4.2 Software Programming

The core of this module is EFR32, Its driving mode is exactly the same as EFR3. Users can operate according to

EFR32 chip datasheet.
Burning program: The module is SoC with its own GPIO port, uses the J-LINK special downloader for program

download
Program download interface definition:
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E76-433M20S User Manual
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