CLM920_NC2_LTE M.2 Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
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The module acts as a USB slave device and supports USB sleep and wake-up mechanisms.
The reference design circuit is as follows:
Figure 3-7 USB connection design circuit diagram
1. USB cable design needs to strictly follow the USB2.0 protocol requirements. Pay attention
to the protection of the data line when wiring, differential trace, control impedance is 90
Ω
.
ESD protection devices should be added to the data line. The equivalent capacitance of the
ESD protection device is less than 1pF.
2. The USB bus supply voltage is provided internally by the module and does not need to be
provided externally. At the same time, since the USB interface of the module does not provide
USB bus power, the module can only be used as a slave device of the USB bus.
The USB interface supports the following features:
Software download upgrade
Data communication
AT Command
3.5 UART interface
The CLM920_NC2 M.2 module provides a set of UART interfaces with a serial port level
of 1.8V. Through the serial port, you can send AT commands, print program log information,
and so on.
The module serial port supports 9600, 19200, 38400, 57600, 115200, 230400bps baud rate,
the default is 115200bps.
The UART interface is defined as follows:
