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GSM/GPRS Module Series

M85 Hardware Design

M85_Hardware_Design Confidential / Released 23 / 88

3.2. Operating Modes

The table below briefly summarizes the various operating modes in the following chapters.

Table 4: Overview of Operating Modes

Mode

Function

Normal

Operation

GSM/GPRS

Sleep

After enabling sleep mode by AT+QSCLK=1, the module will

automatically go into Sleep Mode if DTR is set to high level and

there is no interrupt (such as GPIO interrupt or data on UART

port). In this case, the current consumption of module will reduce

to the minimal level. During Sleep Mode, the module can still

receive paging message and SMS from the system normally.

GSM IDLE

Software is active. The module has registered to the GSM

network, and the module is ready to send and receive GSM data.

GSM TALK

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.

GPRS IDLE

The module is not registered to GPRS network. The module is

not reachable through GPRS channel.

GPRS

STANDBY

The module is registered to GPRS network, but no GPRS PDP

context is active. The SGSN knows the Routing Area where the

module is located at.

GPRS READY

The PDP context is active, but no data transfer is ongoing. The

module is ready to receive or send GPRS data. The SGSN

knows the cell where the module is located at.

GPRS DATA

There is GPRS data in transfer. In this mode, power consumption

is decided by the PCL, working RF band and GPRS multi-slot

configuration.

POWER DOWN

Normal shutdown by sending the AT+QPOWD=1 command or using the PWRKEY

or the EMERG_OFF

pin. The power management ASIC disconnects the power

supply from the base band part of the module, and only the power supply for the

RTC is remained. 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 module to a minimum functionality mode without

removing the power supply. In this case, the RF part of the module will not work or

the SIM card will not be accessible, or both RF part and SIM card will be disabled,

but the UART port is still accessible. The power consumption in this case is very

low.