User's Manual

Shenzhen Neoway Technology Co., Ltd. Page 23 of 32

The antenna should be installed a long distance away from the SIM card and SIM card traces,
especially to the build-in antenna.

The PCB traces of SIM should be as short as possible and shielded with GND copper.

The ESD diodes or small capacitors should be closed to SIM card.
Note:
Small capacitors and the junction capacitance of the ESD diode are to avoid the interference from/to
antenna, ensuring the correct SIM access and good RF performance.
6.6 Running LED Indicator
Table6 Running Indicator
Signal
I/O
Function
Note
BACK_LIGHT
DO
Running Status
Can drive a LED directly
The various blink behaviors of LED indicate different of module status.
It can output a 4mA current and 2.8V voltage, therefore a LED can be directly connected to this pin
with a resistor in series. For better luminance, drive the LED with a transistor instead, see Figure 17.
Figure 17 LED Indicator