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E103-W11 UserManual
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8Hardware design
It is recommended to use a DC regulated power supply to supply power to the module, the power supply ripple coefficient should be as
small as possible, and the module should be grounded reliably
Please pay attention to the correct connection of the positive and negative poles of the power supply, such as reverse connection may cause
permanent damage to the module
Please check the power supply to ensure that it is between the recommended power supply voltages. If it exceeds the maximum value, the
module will be permanently damaged;
Please check the stability of the power supply, the voltage should not fluctuate greatly and frequently;
When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the margin, so that the whole
machine can work stably for a long time;
The module should be kept as far away as possible from the power supply, transformer, high-frequency wiring and other parts with large
electromagnetic interference;
High-frequency digital traces, high-frequency analog traces, and power traces must avoid the underside of the module. If it is
absolutely necessary to pass under the module, assuming that the module is soldered on the Top Layer, ground copper is placed on
the Top Layer of the contact part of the module (all layers). 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 soldered or placed on the Top Layer, it is also wrong to arbitrarily route wires on the Bottom Layer or other layers,
which will affect the stray and receiving sensitivity of the module to varying degrees;
Assuming that there are devices with large electromagnetic interference around the module, it will also greatly affect 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, high-
frequency analog, power traces), the performance of the module will also be greatly affected. It is recommended to stay away
from the module according to the intensity of the interference. Proper isolation and shielding;
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 TTL protocols whose physical layer is also 2.4GHz, for example: USB3.0;
The antenna installation structure has a great influence on the performance of the module. Make sure that the antenna is exposed,
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 is not allowed to be installed inside the metal shell, which will greatly reduce the transmission distance.
