M20 Hardware Design
from low to
high, the
module would
execute a SIM
card
initialization
process. If
unused keep
this pin open.
SIM_GND
Digital Ground of SIM Card
This pin is
internally
connected to
GND and
dedicated for
SIM Card
ground.
AUXADC
PIN NAME
I/O DESCRIPTION
DC CHARACTERISTICS COMMENT
ADC1
I
ADC input
voltage range: 0V to 2.8V
If unused keep
this pin open.
3.2 Operating modes
The table below briefly summarizes the various operating modes that the module supports.
Table 6: Overview of operating modes
Mode
Function
GSM/GPRS
SLEEP
The module will automatically enter SLEEP mode if DTR is
set to high level when the slow clocking mode is enabled by
setting “AT+QSCLK=1” and there is no other task under
execution.
In this case, the current consumption of module will be reduced
to very low level.
During SLEEP mode, the module can still receive paging
message for voice or SMS from GSM system.
GSM IDLE
Software is active and the main controller is always running.
The module has registered to GSM network thus it can receive
paging message from network or send request to network.
Normal operation
GSM TALK
GSM connection is going. In this case, the power consumption
depends on network configurations such as Power Control
Level (PCL) and working ARFCN channel.
M20_HD_V1.01
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Quectel
