Basic Operation; Hardware Design - Ebyte E220-900M22S Manual

Chengdu Ebyte Electronic Technology Co.,Ltd.
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For the pin definition, software driver and communication protocol of the module, please refer to the official llcc68 datasheet
of Semtech

4 Basic operation

4.1 Hardware design

It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small as possible and
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the module needs to be reliably grounded;
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;
Please check the power supply to ensure that between the recommended supply voltage, if exceeding the maximum,
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the module will be permanently damaged;
Please check the stability of the power supply. Voltage can 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
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margin, 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 other
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parts with large electromagnetic interference;
Bottom LayerHigh-frequency digital routing, high-frequency analog routing, and power routing must be avoided
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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(well grounded), it must be close to the digital
part of the module and 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 Layer
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or 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
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affect the 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,
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power traces) around the module that 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
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still a risk of damage);
Try to stay away from some physical layers such as TTL protocol at 2.4GHz , for example: USB3.0;
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NRST input
MISO output
MOSI input
SCK input
NSS input
GND
ANT
GND
Chip reset trigger input pin, low level effective
SPI data output pin
SPI data input pin
SPI clock input pin
The module chip selection pin is used to start a SPI communication
Ground, connect to power reference ground
RF interface, stamp hole
Ground, connect to power reference ground
E220-900M22S User Manual
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