Chengdu Ebyte Electronic Technology Co.,Ltd.
E220-400M22S User Manual
Copyright ©2012–2021
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
9
The antenna installation structure has a great influence on the module performance, so it is necessary to ensure that
the antenna is exposed, preferably vertically upward. When the module is installed inside the housing, the
high-quality antenna extension line can be used to extend the antenna to the outside of the housing;
The antenna must not be installed inside the metal shell, which will greatly weaken the transmission distance.
It is suggested to add 200R protection resistance in RXD / TXD of external MCU.
4.2 Programming
This module is peripheral circuit, users can operate according to llcc68 chip manual completely;
Dio1, dio2 and DIO3 are common IO ports, which can be configured into multiple functions. Dio2 can be connected
to TXEN, not to IO port of MCU, and is used to control RF switch emission. See llcc68 manual for details, and can
be suspended if not used;
The internal use of 32mhz passive crystal oscillator, without pin control, software program control can be;
The differences between llcc68 and sx1262 / sx1268 were as follows
1.
Sx1262 / sx1268 supports spread spectrum factors sF5, SF6, sf7, SF8, Sf9, SF10, SF11 and SF12;
Llcc68 supports spread spectrum factors sF5, SF6, sf7, SF8, Sf9, SF10 and SF11.
2.
Llcc68 can set the spread spectrum factor and receive bandwidth:
LoRa® Rx/Tx, BW = 125 – 250 – 500 kHz
LoRa®
，
SF = 5 - 6 - 7 - 8 - 9 for BW = 125 kHz
，
LoRa®
，
SF = 5 - 6 - 7 - 8 - 9 - 10 for BW = 250 kHz
，
LoRa®
，
SF = 5 - 6 - 7 - 8 - 9 - 10 - 11 for BW = 500 kHz
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