User Manual

Table Of Contents
XT55/56 Hardware Interface Description
Confidential / Preliminary
s
XT55/56_hd_v02.96 Page 55 of 125 18.08.2005
3.7 Summary of State Transitions (Except SLEEP Mode)
Table 12: State transitions of XT55/56 (except SLEEP mode)
The table shows how to proceed from one GSM mode to another (grey column = present mode, white columns = intended modes)
Further mode ÎÎÎ
Present mode
POWER DOWN Normal mode
**)
Charge-only mode
*)
Charging in normal mode
*)**)
Alarm mode
POWER DOWN mode
without charger
--- GSM_IGT >100 ms at
low level
Connect charger to input
of ext. charging circuit and
GSM_POWER pin (high
level at GSM_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 GSM_POWER pin of
XT55/56)
--- GSM_IGT >1 s at low
level, if battery is fully
charged
100ms < GSM_IGT <
500ms at low level
GSM_IGT >1 s at low level Wake-up from POWER
DOWN mode (if activated
with AT+CALA)
Normal mode
**)
AT^SMSO
or
exceptionally
GSM_EMERGOFF pin > 3.2s
at low level
--- No automatic transition,
but via “POWER DOWN”
Connect charger to
GSM_POWER pin at
XT55/56 (high level at
GSM_POWER)
AT+CALA followed by
AT^SMSO. XT55/56 enters
Alarm mode when specified
time is reached.
Charge-only mode
*)
Disconnect charger (XT55/56
GSM_POWER pin at low
level)
or
AT^SMSO
or
exceptionally
GSM_EMERGOFF pin >
3.2s
at low level
No automatic transition,
but via “Charge in Normal
mode”
--- GSM_IGT >1s at low level AT+CALA followed by
AT^SMSO. XT55/56 enters
Alarm mode when specified
time is reached and
V
GSM_BATT+
>3.2V
Charging in normal
mode
*)
**)
AT^SMSO Î “Charge-only
mode”, again AT^SMSO
or
exceptionally
GSM_EMERGOFF pin >
3.2s
at low level
Disconnect charger from
input of ext. charging
circuit and module’s
GSM_POWER pin
AT^SMSO --- No direct transition
Alarm mode AT^SMSO or exceptionally
GSM_EMERGOFF pin >
3.2s
at low level
GSM_IGT >100ms at low
level
AT^SMSO if charger is
connected
GSM_IGT >100ms at low
level
---
*)
See Chapter 3.5.4 for details on the charging mode
**)
Normal mode covers TALK, DATA, GPRS, IDLE and SLEEP modes