EGS5 Hardware Interface Description
3.3 Power Up / Power Down Scenarios
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EGS5_HD_v02.004
Page 28 of 123
2012-02-09
Confidential / Released
3.3
Power Up / Power Down Scenarios
In general, be sure not to turn on EGS5 while it is beyond the safety limits of voltage and tem-
perature stated in
. EGS5 would immediately switch off after having started and de-
tected these inappropriate conditions. In extreme cases this can cause permanent damage to
the module.
3.3.1
Turn on EGS5
EGS5 can be started in a variety of ways as described in the following chapters:
•
Hardware driven start-up by IGT line: starts Normal mode or Airplane mode (see
)
•
Software controlled reset by AT+CFUN command: starts Normal mode or Airplane mode
(see
)
•
Hardware driven start-up by VCHARGE line: starts charging algorithm and charge-only
mode (see
)
•
Wake-up from Power-down mode by using RTC interrupt: starts Airplane mode
The option whether to start into Normal mode or Airplane mode depends on the settings made
with the AT^SCFG command or AT+CALA. With AT+CALA, followed by AT^SMSO the module
can be configured to restart into Airplane mode at a scheduled alarm time. Switching back and
forth between Normal mode and Airplane mode is possible any time during operation by using
the AT^SCFG command.
After startup or mode change the following URCs indicate the module’s ready state:
•
“SYSSTART” indicates that the module has entered Normal mode.
•
"^SYSSTART AIRPLANE MODE” indicates that the module has entered Airplane mode.
•
"^SYSSTART CHARGE ONLY MODE” indicates that the module has entered the Charge-
only mode.
These URCs are indicated only if the module is set to a fixed bit rate, i.e. they do not appear if
autobauding is enabled (AT+IPR
0).
Detailed explanations on AT^SCFG, AT+CFUN, AT+CALA, Airplane mode and AT+IPR can
be found in
