Chengdu Ebyte Electronic Technology Co., Ltd. E19 -868M20S User Manual
Copyright ©2012–2018
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
6
The mounting structure of antenna has a great influence on the performance of the module. It is necessary to ensure
that the antenna is exposed, preferably vertically upward. When the module is mounted inside the case, use a good
antenna extension cable to extend the antenna to the outside
；
The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly
weakened.
4.2 Software editing
SX1278/PA+LNA
，
same drive way as SX1278/SX1276
，
user can refer to SX1278/SX1276 datasheet.
DIO0
、
DIO1
、
DIO2
、
DIO3
、
DIO4
、
DIO5 are configurable I/O ports for various application
，
see more in SX1276
datasheet. It can be floated when not used.
RST
、
TXEN
、
RXEN must be connected,among which RST control chip reset
，
TXEN, RXEN are for controlling
RF switch.
Make it ground well with large space for grounding and small power ripple. Filter capacitor is necessary and make
sure it is close to pin VCC and GND.
SPI communication rate should not be set too high, usually around 1Mbps.
In transmitting
，
set TXEN as high communication level
，
RXEN pin is low level; In receiving, set RXEN as high
communication level,TXEN is low level; Before powering off, set TXEN
、
RXEN as low level.
Re-initialize register configuration when the chip is idle for higher stability.
5.Basic application
5.1 Basic circuit diagram
