M10 Hardware Design
3.5.2 SLEEP mode (slow clock mode)
We can control module to enter or exit the SLEEP mode in customer applications through DTR
signal. When DTR is in high level, and there is no on air and hardware interrupt (such as GPIO
interrupt or data on serial port), the module will enter SLEEP mode automatically. In this mode,
the module can still receive paging or SMS from network but the serial port is not accessible.
Note: For module, it requests to set AT command “AT+QSCLK=1” to enable the SLEEP mode;
the default value is 0, that can’t make the module enter SLEEP mode. For more details, please
refer to our AT command list.
3.5.3 Wake up module from SLEEP mode
When the module is in SLEEP mode, the following methods can wake up the module.
z Enable DTR pin to wake up.
If DTR Pin is pulled down to a low level，this signal will wake up module from power saving
mode. The serial port will be active after about 20ms when DTR be changed to low level.
z Receiving a voice or data call from network to wake up module.
z Receiving a SMS from network to wake up module.
z RTC alarm expired to wake up module.
z Keypad and PWRKEY interrupt
Note: DTR pin should be held low level during communicating between the module and DTE.
3.6 Summary of state transitions (except SLEEP mode)
Table 8: Summary of state transitions
Further mode
Current mode
POWER DOWN Normal mode Alarm mode
POWER DOWN Use PWRKEY Switch on from POWER DOWN
mode by RTC
Normal mode AT+QPOWD, use
PWRKEY pin, or
use EMERG_OFF
pin
Set alarm by “AT+QALARM”,
and then switch off the module.
When the timer expire, the
module turn on and enter Alarm
mode
Alarm mode Use PWRKEY
pin or wait
module switch off
automatically
Use AT+CFUN
M10_HD_V1.00 - 31 -
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