CLM920_AC5 Mini PCIE LTE Module Hardware Manual
Shanghai Yuge Information Technology co., LTD
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2. It is recommended to add a filter capacitor (10pF, 33pF, 100nF, 10uF, 220uF, etc.) at the
VBAT pin to reduce voltage drop and reduce power supply ripple and place it close to the
VBAT pin.
3. The minimum working voltage of the module is 3.3V. Due to the transmission of data or
GSM calls, a current of more than 2A will be generated, resulting in a ripple voltage drop 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 Power on / off reset mode
The CLM920_AC5 Mini PCIE module only supports one power-on boot method. Users can
determine whether the module is powered on by querying the high and low levels of the
VDD_EXT pin.
Table 3-4 Pin Definition of Switch Reset
Pin
Signal name
I/O
High value
Description
22
RESET
DI
1.8V
Module reset control pin, active low
