GSM/GPRS/GNSS Module Series
MC60 Series Hardware Design
MC60_Series_Hardware_Design Confidential / Released 35 / 114
Based on system requirements, there are several actions to drive the GSM part to enter into low current
consumption status. For example, AT+CFUN can be used to set the part into minimum functionality mode,
and DTR hardware interface signal can be used to lead the system to Sleep mode.
3.6.1.1. Minimum Functionality Mode
Minimum functionality mode reduces the functionality of the GSM part to a minimum level. The
consumption of the current can be minimized when the slow clocking mode is activated at the same time.
The mode is set via the AT+CFUN command which provides the choice of the functionality levels
<fun>=0, 1, 4.
0: minimum functionality
1: full functionality (default)
4: disable from both transmitting and receiving RF signals
message and SMS from the system normally.
Software is active. The GSM part has registered on GSM
network, and it is ready to send and receive GSM data.
GSM connection is ongoing. In this mode, the power
consumption is decided by the configuration of Power Control
Level (PCL), dynamic DTX control and the working RF band.
The GSM part is not registered on GPRS network. It is not
reachable through GPRS channel.
The GSM part is registered on GPRS network, but no GPRS
PDP context is active. The SGSN knows the Routing Area
where the module is located at.
The PDP context is active, but no data transfer is ongoing. The
GSM part is ready to receive or send GPRS data. The SGSN
knows the cell where the module is located at.
There is GPRS data in transfer. In this mode, power
consumption is decided by the PCL, working RF band and
GPRS multi-slot configuration.
Normal shutdown by sending the AT+QPOWD=1 command or using the
PWRKEY pin. The power management ASIC disconnects the power supply from
the base band part of the GSM part. Software is not active. The UART interfaces
are not accessible. Operating voltage (connected to VBAT) remains applied.
Minimum
Functionality Mode
(without removing
power supply)
AT+CFUN command can set the GSM part to a minimum functionality mode
without removing the power supply. In this case, the RF part of the GSM part will
not work or the (U)SIM card will not be accessible, or both RF part and (U)SIM
card will be disabled; but the UART port is still accessible. The power
consumption in this case is very low.
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