SX127X RF Module User Manual of E19 Series Modules
Copyright
©
2012
–
2017
，
Chengdu Ebyte Electronic Technology Co.,Ltd
7
⚫
Make sure the grounding is good, with low power ripple, also should increase filter capacitor and as close as possible to the VCC and
GND pins.
⚫
SPI communication rate should not be set too high, usually around 1M
⚫
Make sure TXEN pin is high level, RXEN pin is low level when transmitting;
make sure RXEN pin is high level, TXEN pin is low level when receiving;
make sure TXEN
、
RXEN pin is low level before turning off.
⚫
The register configuration can be reinitialized to obtain higher stability when the chip is invalid.
5. Production Guidance
5.1 Reflow Temperature
Preheating zone
：
Maximum temperature rise is 2.5
℃
/s
；
Insulation zone
：
temperature: 150~190
℃，
time: 60~90s
，
Maximum temperature rise is 2.5
℃
/s
；
Recirculation zone
：
Maximum temperature is 235~245
℃，
Above 217
℃
, the time will be 40~80s
；
Cooling zone
：
Maximum cooling is 4
℃
/s.
5.2
Reflow Graph
6. FAQ
6.1 The communication distance is too close
⚫
When there
’
s straight C
ommunication barrier, the communication distance will be reduced accordingly.
⚫
Temperature, humidity and same frequency interference will increase the rate of communication packet loss.
⚫
Ground absorption, reflected radio waves, and closing to ground will lead to poor test result.
⚫
Sea water has a strong ability to absorb radio waves, so test near the sea is not recommended .
⚫
If antennas surrounded by metal items or placed in metal shell, the signal will be weakened badly.
⚫
Power register is set wrongly or air data rate too high.(The higher the air data rate, the closer the distance.
⚫
In room temperature, the power voltage will be less than 2.5V. The lower the the power voltage, the smaller the power.
⚫
The antenna is unmatched to the module or the quality of antenna.
