Siemens MC45

MC45 Hardware Interface Description
P R E L I M I N A R Y
MC45_HD_01_V00.02a Page 45 of 90 12.08.2002
3.3.5 Summary of state transitions
Table 12: State transitions of MC45
The table shows how to proceed from one mode to another (gray column = present mode, white columns = intended modes)
Further mode
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Present mode
POWER DOWN Normal mode
**)
Charge-only mode
*)
Charging in normal
mode
*)**)
Alarm mode
POWER DOWN
mode without charger
--- /IGT >100 ms at low
level
Connect charger to
POWER (high level at
POWER)
No direct transition, but
via “Charge-only mode” or
“Normal mode”
Wake-up from POWER
DOWN mode (if
activated with AT+CALA)
POWER DOWN
mode with charger
(high level at POWER
pins of MC45)
--- /IGT (if supply voltage
is above 3.0V). No
automatic transition,
but via POWER
DOWN mode without
charger
100ms < /IGT < 500ms
at low level
/IGT >1 s at low level Wake-up from POWER
DOWN mode (if
activated with AT+CALA)
Normal mode
**)
AT^SMSO
or
exceptionally /EMERGOFF
pin > 3.2s at low level
--- No automatic transition,
but via “POWER
DOWN”
Connect charger to
POWER pin at MC45
(high level at POWER)
AT+CALA followed by
AT^SMSO. MC45 enters
Alarm mode when
specified time is reached.
Charge-only mode
*)
Disconnect charger (MC45
POWER pin at low level)
or
AT^SMSO or
exceptionally /EMERGOFF
pin >
3.2s at low level
No automatic
transition, but via
“Charge in Normal
mode”
--- /IGT >1s at low level AT+CALA followed by
AT^SMSO. MC45 enters
Alarm mode when
specified time is reached
and V
BATT+
<3.3V
Charging in normal
mode
*) **)
Via “Charge-only mode”
or
exceptionally
/EMERGOFF pin >
3.2s at
low level
Disconnect charger
from POWER pin at
MC45
AT^SMSO --- No direct transition
Alarm mode AT^SMSO or
exceptionally /EMERGOFF
pin >
3.2s at low level
/IGT >100ms at low
level
No transition /IGT >100ms at low level ---
*)
See Chapter 3.2.3.4 for details on the charging mode
**)
Normal mode covers TALK, DATA, GPRS, IDLE and SLEEP modes