User Manual

Table Of Contents
XT55/56 Hardware Interface Description
Confidential / Preliminary
s
XT55/56_hd_v02.96 Page 31 of 125 18.08.2005
3.3 Power Up / Down Scenarios
In general, be sure not to turn on GSM part of the XT55/56 module while it is out of the
operating range of voltage and temperature stated in Chapters 6.2 and 6.3. The GSM part of
the XT55/56 would immediately switch off after having started and detected these
inappropriate conditions.
3.3.1 Turn on the GSM Part of XT55/56
The GSM part of the XT55/56 can be activated in a variety of ways, which are described in
the following chapters:
via ignition line GSM_IGT: starts normal operating state (see Chapters 3.3.1.1 and
3.3.1.2)
via GSM_POWER line: starts charging algorithm (see Chapters 3.5.4 and 3.3.1.3)
via RTC interrupt: starts Alarm mode (see Chapter 3.3.1.4)