User's Manual

GE866-DUAL Hardware User Guide
1VV0301051 Rev. 2 – 2014-04-07 7
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Mod. 0805 2011-07 Rev.2
5.2. Turning OFF the GE866-QUAD
Turning off of the device can be done in two ways:
• General turn OFF
• Processor turn OFF
General turn OFF – disconnect the power supply from the both
power pins VBATT and VBATT_PA at the same time. In this case
all parts of the module are in OFF condition, no power
consumption is present.
Processor turn OFF – disconnect the power supply only from the
power pin VBATT, the power pin VBATT_PA can be connected to
power supply, in this case a low, about 30uA, power
consumption is present
Before either of both OFF procedures is applied, the
AT#SYSHALT AT command must be sent (see AT Commands Reference
Guide, 80000ST10025a), after the OK response message, wait for
10 seconds, then the module can be consider fully not
operating and at this moment is possible disconnect the Power
Supply.
The following flow chart shows the proper turnoff procedure: