Chengdu Ebyte Electronic Technology Co.,Ltd.
E220-400M30S User Manual
Copyright ©2012–2021
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
8
Assuming that the module is welded or placed in the top layer, it is also wrong to route at will in the bottom layer or
other layers, which will affect the spurious and receiving sensitivity of the module in different degrees;
Assuming that there are large electromagnetic interference devices around the module will greatly affect the
performance of the module, it is recommended to keep away from the module according to the intensity of
interference, and appropriate isolation and shielding can be done if the situation permits;
Assuming that there are lines (high-frequency digital, high-frequency analog and power lines) with large
electromagnetic interference around the module, the performance of the module will be greatly affected. According
to the intensity of interference, it is recommended to keep away from the module. If the situation permits,
appropriate isolation and shielding can be done;
If 5V level is used for communication line, 1k-5.1k resistor must be connected in series (not recommended, there is
still risk of damage);
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.
4.2 Programming
This module is PA+LNA, and its driving method is completely equivalent to LLCC68, and users can
operate in accordance with the LLCC68 chipset datasheet;
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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