Siemens XT55 AVL Manual de usuario descargar pdf (Pagina 37)

XT55 AVL User’s Guide

Confidential/Released

mo b i l e

XT55_avl_ug_V03 Page 37 of 37 28.06.2004

Figure 13 shows a typical example of a portable AVL application set.

Power will be supplied from an integrated Li-Ion battery pack. The charging control is

integrated in the GSM part of the XT55 module and can be used for the entire module, see

[2] for details. The headset jack is assigned to audio interface 1 of the XT55 module. The

MICP2 and MICN2 lines are intended for feeding a microphone.

Switch on /off procedure

The GSM part of the XT55 module can be powered on by pressing the ON/OFF key. The

ignition line (IGT) goes low level via the pnp transistor. During the start-up procedure the

VDD line output goes active high and the low drop regulator will be switched on. This causes

the GPS part of the XT55 module to start-up.

When pressing the ON/OFF key during operation the XT55 module will be switched off safely

using the internally activated AT^SMSO command.

NOTE: No warranty can be given for the example above because the functionality and the

compliance with regional regulations are depending in a great amount on the used electronic

components and the application layout.

Power supply ratings can be found in Table 3. For further details refer to [2]

Table 3: Average supply current without antenna

Parameter Description Conditions Typ Unit

GPS_VCC

Average supply

current

Continuous mode (without

antenna feeding on

GPS_VCC_RF)

80 mA

Please note that the stated current values are depending on the used mode of the module

1 2 ... 32 33 34 35 36 37

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Siemens XT55 AVL Manual de usuario Pagina 37