I65/I56I HARDWARE DESCRIPTION VERSION
1.00
Figure 20: URC transmission
Function
Pin
Status
Description
0
SLEEP mode CFUN=0 or CYCLIC
SLEEP mode CFUN=5 or 6, the module
is caused to wake up to full functionality.
If CFUN=7 or 8, power saving is
resumed after URC transmission or end
of call.
Ring
indication
RING_0
1
No operation
Table 17:
ASC0 ring signal
5.9 Power saving
SLEEP mode reduces the functionality of the GSM/GPRS engine of the
I56/I56i module to a minimum and, thus, minimizes the current consumption to
the lowest level. Settings can be made using the
AT+CFUN
command. For
details see below and [
]. SLEEP mode falls into two categories:
NON-CYCLIC SLEEP mode
AT+CFUN=0
CYCLIC SLEEP modes, selectable with
AT+CFUN=5,6,7,8
or
9
.
IMPORTANT: Please keep in mind that power saving works properly only
when PIN authentication has been done. If you attempt to
activate power saving while the SIM card is not inserted or the
PIN not correctly entered, the selected <fun> level will be set,
though power saving does not take effect. For the same reason,
power saving cannot be used if the GSM/GPRS engine of the
I56/I56i operates in Alarm mode.
To check whether power saving is on, you can query the status of
AT+CFUN
if
you have chosen CYCLIC SLEEP mode. If available, you can take advantage
of the status LED controlled by the GPIO1 pin (see chapter
stops flashing once the module starts power saving. The wake-up procedures
are quite different depending on the selected SLEEP mode.
compares
the wake-up events that can occur in NON-CYCLIC and CYCLIC SLEEP
modes.
5.9.1 No power saving (AT+CFUN=1)
The functionality level <fun>=1 is where power saving is switched off. This is
the default after start-up.
5.9.2 NON-CYCLIC SLEEP mode (AT+CFUN=0)
If level 0 has been selected (
AT+CFUN=0
), the serial interface is blocked. The
module shortly deactivates power saving to listen to a paging message sent
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