Summary Of State Transitions (Except Sleep Mode) - SimCom SIM548C HD V1.01 Hardware Design

SIM548C Hardware Design
about 40ms.
Receiving a voice or data call from network to wake up the GSM part of the module
Receiveing a SMS from network to wake up the GSM part of the module
RTC alarm expired to wake up the GSM part of the module
Note: DTR pin should be held low level during communicating between the module and DTE.

3.7 Summary of state transitions (except SLEEP mode)

Table 12: Summary of state transitions
Further POWER
mode DOWN
Current
mode
POWER
DOWN
Normal AT+CPOWD
mode or use
PWRKEY pin
Ghost Disconnect
mode charger
(Charge-
only
mode)
SIM548C_HD_V1.01
Normal Ghost mode
mode (Charge-only
mode)
Use Connect charger
PWRKEY to VCHG and
connect battery to
VBAT
Connect charger
to VCHG and
connect battery to
VBAT, then
switch off module
by AT+CPOWD
or using
PWRKEY
No direct
transition, but
via "Charging
in normal"
mode
40
Charging in Alarm mode
normal
No direct Switch on from
transition, but via POWER DOWN
"Ghost mode" or mode by RTC
"Normal mode"
Connect charger Set alarm by
to VCHG pin of "AT+CALARM
module and ", and then
connect battery to switch off the
VBAT pin of module. When
module the timer expires,
the module turns
on and enters
Alarm mode
Turn on the Set alarm by
module using "AT+CALARM
PWRKEY OR ", when the timer
SET AT expire, module
Command will enter Alarm
"AT+CFUN=1" mode
09.05.2008