User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Document history
- Introduction
- Product concept
- GSM application interface
- GSM/GPRS operating modes
- Power supply
- Power up / down scenarios
- Automatic GPRS Multislot Class change
- Charging control of the GSM part
- Power saving
- Summary of state transitions (except SLEEP mode)
- RTC backup for GSM part of XT55/56
- Serial interfaces of the XT55/56 GSM part
- Audio interfaces
- SIM interface
- Control signals
- GPS application interface
- GSM and GPS antenna interfaces
- Electrical, reliability and radio characteristics
- Mechanics
- Reference approval
- Example applications
- List of parts and accessories
XT55/56 Hardware Interface Description
Confidential / Released
s
XT55/56_hd_v02.06a Page 51 of 125 17.12.2004
3.6.6 Wake up XT55/56 from SLEEP mode
A wake-up event is any event that causes the module to draw current. Depending on the
selected mode the wake-up event either switches SLEEP mode off and takes XT55/56 back
to AT+CFUN=1, or activates XT55/56 temporarily without leaving the current SLEEP mode.
Definitions of the state transitions described in Table 11:
Quit = XT55/56 exits SLEEP mode and returns to AT+CFUN=1.
Temporary = XT55/56 becomes active temporarily for the duration of the event and the
mode-specific follow-up time after the last character was sent or received
on the serial interface.
No effect: = Event is not relevant in the selected SLEEP mode. XT55/56 does not
wake up.
Table 11: Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes
Event Selected mode
AT+CFUN=0
Selected mode
AT+CFUN=5 or 6
Selected mode
AT+CFUN=7, 8, 9
Ignition line No effect No effect No effect
GSM_RTS0 or GSM_RTS1
1)
(falling edge)
Quit No effect (GSM_RTS
is only used for flow
control)
Mode 7 and 8: No
effect (GSM_RTS is
only used for flow
control)
Mode 9: Temporary
Unsolicited Result Code
(URC)
Quit Quit Temporary
Incoming voice or data call Quit Quit Temporary
Any AT command
(incl. outgoing voice or data
call, outgoing SMS)
Not possible
(UART disabled)
Temporary Temporary
Incoming SMS depending on
mode selected by AT+CNMI:
AT+CNMI=0,0 (= default, no
indication of received SMS)
AT+CNMI=1,1 (= displays
URC upon receipt of SMS)
No effect
Quit
No effect
Quit
No effect
Temporary
GPRS data transfer Not possible
(UART disabled)
Temporary Temporary
RTC alarm Quit
2)
Quit Temporary
AT+CFUN=1 Not possible
(UART disabled)
Quit Quit
1)
During the CYCLIC SLEEP modes 5, 6, 7, and 8, GSM_RTS0 and GSM_RTS1 are
conventionally used for flow control: The assertion of GSM_RTS0 or GSM_RTS1
signals that the application is ready to receive data - without waking up the module. If
the module is in CFUN=0 mode the assertion of GSM_RTS0 and GSM_RTS1 serves
as a wake-up event, giving the application the possibility to intentionally terminate
power saving. If the module is in CFUN=9 mode, the assertion of GSM_RTS0 or