Chapter 4 Basic Operation; Hardware Design - Ebyte E49-400M30S User Manual

Chengdu Ebyte Electronic Technology Co.,Ltd.
12 GND
13 GPIO2
14 GPIO1
15 FCSB
16 CSB
17 SDIO
18 SLCK
19 NC
20 GND
21 ANT
22 GND

Chapter 4 Basic operation

4.1 Hardware design

DC regulated power supply is recommended to power the module, the ripple coefficient of the power supply should
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be as small as possible, and the module should be reliably grounded;
Please pay attention to the correct connection of the positive and negative poles of the power supply, such as the
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reverse connection may cause permanent damage to the module;
Please check the power supply to ensure that between the recommended power supply voltage, if the maximum
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value is exceeded, it will cause 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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In the design of power supply circuit for modules, it is often recommended to retain more than 30% of the
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allowance, which is conducive to long-term and stable work;
The module should be far away from the power supply, transformers, high-frequency wiring and other parts with
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greater electromagnetic interference;
High-frequency digital wiring, high-frequency analog wiring and power wiring must avoid the Bottom Layer of the
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module. If it is really necessary to pass through the Bottom Layer of the module, assuming that the module is
welded on the Top Layer, the Top Layer in the contact part of the module must be copper paved (all copper paved
and well grounded), close to the digital part of the module and wire in the Bottom Layer;
It is also a mistake to assume that modules are soldered or placed in the Top Layer, and that random wiring in the
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Bottom Layer or other layers will affect module stray and reception sensitivity to varying degrees;
If there are devices with large electromagnetic interference around the module, it will also greatly affect the
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performance of the module. According to the intensity of the interference, it is recommended to stay away from the
module appropriately. If the situation permits, appropriate isolation and shielding can be done;
If there are wires (high frequency digital, high frequency analog, power supply wiring) around the module that have

large electromagnetic interference, it 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. If the situation permits,
appropriate isolation and shielding can be done;
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Ground
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Input/output Configurable general IO port (see CMT2300A manual for details)
Input/output Configurable general IO port (see CMT2300A manual for details)
input SPI accesses FIFO slice selection
input SPI accesses FIFO slice selection
Input/output SPI data input and output
input SPI clock pin
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Ground
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Antenna interface, stamp hole (50Ω characteristic impedance)
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Ground
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E49-400M30S User Manual
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