Use Instructions
Table Of Contents
- 1 About this document
- 2 Product Overview
- 3 Interface Description
- 3.1 PIN Definition
- 3.2 Operating condition
- 3.3 Digital I/O characteristics
- 3.4 Power Interface
- 3.5 UIM interface
- 3.6 PCM interface(TBD)
- 3.7 USB2.0 interface
- 3.8 UART Interface
- 3.9 Power on/off and reset interface
- 3.10 Interactive interface
- 3.11 Net Light interface
- 3.12 System boot configuration and download
- 3.13 Analog and Digital conversion (ADC) interface
- 3.14 I2C interface
- 3.15 SPI interface
- 3.16 Antenna interface
- 4 Product characteristics
- 5 Design guideline
- 6 Manufacturers
- 7 Package Storage information
- 8 Safety Information
L710HG Hardware Design
40
default, the R1, R2 are 0 Ohm resistors, and the C1, C2 are reserved for tuning.
The RF test connector in the figure is used for the conducted RF performance test, and should be
placed as close as to the module’s antenna pin. The traces impedance between components must be
controlled in 50ohm.
If the environment is very static, you can add TVS or 100nH inductance to the antenna end to enhance
the anti-static capability
3.16.3 Antenna Layout guideline
In layout design, antenna RF transmission line must ensure the characteristic impedance = 50 ohm.
The characteristic impedance depend on substrate board, line width and the distance from the ground
plane. As shown in figure 3-20 is the layout of antenna feed point of reference for clearance area.
Figure 3-26 antenna feed point