CLM920_NC2_LTE M.2 Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
- 20 -
39pF
，
33pF
700
，
850/900MHZ Frequency band Filter out RF interference
18pF
，
8.2pF
，
6.8pF
1700/1800/1900
，
2100/2300
，
2500/2600MHZ Frequency band
Filter out RF interference
To prevent damage to the module from surges and overvoltages, it is recommended to
connect a 5.1V/500mW Zener diode to the VBAT pin of the module.
It is recommended to add 3 ceramic capacitors (33pF, 10pF, 100nF) to the VBAT pin and
place them near the VBAT pin.
The minimum operating voltage of the module is 3.3V. Since the transmission data or
GSM call will generate more than 2A current, the ripple voltage drop will occur on the
power supply voltage, so the power supply voltage must not be lower than 3.3V.
Figure 3-6 GSM TDMA Burst Current Supply Voltage Drop
3.4 USB interface
CLM920_NC2 M.2 module USB interface supports USB2.0 high speed protocol, supports
slave mode, does not support USB charging mode. USB input and output traces must comply
with the USB2.0 feature. The USB interface is defined as follows:
Table 3-5 USB interface pin definition
Pin number
Signal name
IO
description
7
USB_DP
IO
USB2.0 differential
9
USB_DM
IO
USB2.0 differential signal -
