Recommended Connectivity Chart; Hardware Designs - Ebyte E42-400M20S User Manual

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13 GPIO0
14 IRQ
15 PDN
16 MISO
17 MOSI
18 SCK
19 CSN
20 GND
21 ANT
22 GND

4. Recommended Connectivity Chart

5. Hardware Designs

It is recommended to use a DC regulated power supply to power this module, the power supply ripple factor 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 terminals 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 supply voltages, if it exceeds the

maximum value it may cause permanent damage to the module;
please check the power supply stability, the voltage should not fluctuate significantly and frequently;

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General-purpose digital I/O (see HW3000 chip manual for function
Input/Output
details)
Outputs Interrupt output pin (polarity assignable, default active low)
Inputs POWER DOWN mode enable input pin (active high)
Outputs SPI Data Output Pin
Inputs SPI Data Input Pin
Input SPI clock input pin
Input SPI chip select signal (active low)
GND Ground, connect to power reference ground
Antenna connector, stamp hole (50 ohm characteristic impedance)
GND Ground, Connect to Power Reference Ground
E42-400M20S User Manual
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