Confidential
USERS MANUAL
148(158)
Document number
Revision
1/198 17-4/FCP 101 3045 Uen
D
Application
Module
Instructs the module of specific RTC mode
AT+CFUN=10,9,1,100, 0920
Radio responds when the RTC mode is active
RTC SHUTDOWN COMPLETE
Release the MODULE_PWR_EN_B pin
Power down
RTC pulls MODULE_PWR_EN_B pin low at
09:20:00
Radio detects MODULE_PWR_EN_B low, initiates
power on sequence
Radio looks for service and goes idle
Radio remains powered on for 1 minute
Radio
shuts
down
RTC releases MODULE_PWR_EN_B pin
RTC pulls MODULE_PWR_EN_B pin low at
09:30:00
Radio detects MODULE_PWR_EN_B low, initiates
power on sequence
Radio looks for service and goes idle
A MT SMS is received
Set the wakeup event flag for SMS
The change in the RI pin is sensed.
The ring indicator is asserted
Disables RTC mode
Power up
Set MODULE_PWR_EN_B low
Terminate RTC mode: AT+CFUN=1
Radio terminates RTC mode
RTC releases MODULE_PWR_EN_B
Determine wakeup reason: AT*EWAKE?
Returns wakeup reason: *EWAKE: 0010
Read the stored message: AT+CSLM=2
Return the received message: +CSLM: x
Prepare to power down: AT*EWAKE?
AT*EWAKE clears the wakeup reasons
Query current time to set up RTC mode to trigger at
the correct start time
AT*ERTCT?
Radio responds with the current time from the RTC
*ERTCT: 093120, 050121
Instructs the module of specific RTC mode
AT+CFUN=10,9,1,100, 0940
Radio responds when the RTC mode is active
RTC SHUTDOWN COMPLETE
Release the MODULE_PWR_EN_B pin
Power down
6.13 RTC
Examples
6.13.1
Ring Indicator Example
In this example the application would like to go into a power savings mode by power cycling the module every
10 minutes. When the module is power cycled the module remains powered on for one minute. In addition
the application itself is powers down as well. However, the application would like to be notified if an MT SMS
message is received by the module. The wakeup/sleep mode is to run for 1000 minutes.
Application
Module
Inform module of MT SMS notification:
AT*EWAKESET=0010
Radio updates NV to store setting
Instructs the module of specific RTC mode
AT+CFUN=10,9,1,100
Radio responds when the RTC mode is active
RTC SHUTDOWN COMPLETE
Release the MODULE_PWR_EN_B pin
RTC pulls MODULE_PWR_EN_B pin low after 9
minutes