User's Manual

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5 Additional information
To maximize RF performance, the user should follow these recommendations:
1. Power Supply
It is recommended to use DC regulated power supply to the module, and the small power
supply ripple coefficient is required. The module should be reliable grounding, and please
pay attention to the correct connection power, if reverse, maybe result in permanent damage
to the module.
2. About Antenna
Ensure that there is no component, mounting screw or ground plane near the antenna.
All these incorrect design can reduce the communication distance of module seriously.
3. Protection of ESD electrostatic
Modules can be static tested by connecting discharge 4 kv, air discharge 8 kv;
The arc distance module about 10 cm when air discharge;
Therefore, it shall takes all necessary ESD measures in order to avoid permanent damage to
the device.
4. Trade-offs advice on DIOx
DIO has three functions, The first is the RF interrupt flag reflects, the other is the
PLL_Lock signal output, a third is Clock signal output of the RF module (generally do not use
this function). Under the condition of without considering power consumption, can not use any
DIO.
In most application scenarios (transceiver, low-power wake up), DIO0 will choose IO,
other IO can choice according to the situation.
DIO0, DIO1, DIO3 contains all interrupt mapping, If you don't use this feature, DIO0,
DIO3 will meet the requirements;
2F717N01 module provides DIO0,DIO1,DIO3
2F717N10 module provides DIO0,DIO1,DIO2,DIO3,DIO4
2F917N10 module provides DIO0,DIO1,DIO2,DIO3,DIO5
2F917N10 module provides DIO0,DIO1,DIO2,DIO3,DIO5
DIO mapping is shown below: