Chapter 4 Basic Operations; Hardware Design - Ebyte E28-2G4M27SX User Manual

Chengdu Ebyte Electronic Technology Co., Ltd.
User Manual
3 MISO_TX
4 MOSI_RX
5 SCK_RTSN
6 NSS_CTS
7 GND
8 RX_EN
9 TX_EN
10 GND
11 NRESET
12 BUSY
13 DIO1
14 DIO2
15 DIO3
16 GND

Chapter 4 Basic Operations

4.1

Hardware 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, lay copper on the Top Layer of the contact part of the module.
Copper and well grounded), must be close to the digital part of the module and routed on the Bottom
Layer;
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6
SPI data output pin; can also be used as UART transmit pin (see SX1280 manual
Output
for details)
SPI data input pin; can also be used as a UART receive pin (see SX1280 manual
Input
for details)
SPI clock input pin; can also be used as a UART request to transmit pin
Input
(see SX1280 manual for details)
Module chip select pin, used to start an SPI communication; also used for
Input
UART clear transmit pin (See SX1280 manual for details)
Ground wire, connected to the power reference ground
Input LNA control pin, active high
Input PA control pin, active high
Ground wire, connected to the power reference ground
Input Chip reset trigger input pin, active low, built-in pull-up resistor 50K
Output Used for status indication (see SX1280 manual for details)
Input/Output Configurable general-purpose IO ports (see SX1280 manual for details)
Input/Output Configurable general-purpose IO ports (see SX1280 manual for details)
Input/Output Configurable general-purpose IO ports (see SX1280 manual for details)
Ground wire, connected to the power reference ground
E28-2G4M27SX