User's Manual

GE864
GE864GE864
GE864-
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-QUAD Automotive V2 Hardware User Guide
QUAD Automotive V2 Hardware User GuideQUAD Automotive V2 Hardware User Guide
QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 24 of 71
6.2.
6.2.6.2.
6.2. Power Consumption
Power ConsumptionPower Consumption
Power Consumption
The GE864-QUAD Automotive V2 power consumptions are:
Mode
ModeMode
Mode
Average
Average Average
Average
(mA)
(mA)(mA)
(mA)
Mode description
Mode descriptionMode description
Mode description
SWITCHED OFF
SWITCHED OFFSWITCHED OFF
SWITCHED OFF
Switched Off <62uA
Module supplied but Switched Off
IDLE mode
IDLE modeIDLE mode
IDLE mode
AT+CFUN=1 19,0 Normal mode: full functionality of the module
AT+CFUN=4 18,0
Disabled TX and RX; module is not registered on the
network
3,9 Paging Multiframe 2
2,9 Paging Multiframe 4
2,1 Paging Multiframe 6
1,9 Paging Multiframe 8
AT+CFUN=0 or =5
1,6 Paging Multiframe 9
CSD TX and RX mode
CSD TX and RX modeCSD TX and RX mode
CSD TX and RX mode
GSM900 CSD PL5 305,0
DCS1800 CSD PL0 208,0
GSM VOICE CALL
GPRS (class 10) 1TX
GPRS (class 10) 1TXGPRS (class 10) 1TX
GPRS (class 10) 1TX
GSM900 PL5 264,0
DCS1800 PL0 176,0
GPRS Sending data mode
GPRS (class 10) 2TX
GPRS (class 10) 2TXGPRS (class 10) 2TX
GPRS (class 10) 2TX
GSM900 PL5 473,8
DCS1800 PL0 307,8
GPRS Sending data mode
The GSM system is made in a way that the RF transmission is not continuous, else it is
packed into bursts at a base frequency of about 216 Hz, the relative current peaks can
be as high as about 2A. Therefore the power supply has to be designed in order to
withstand with these current peaks without big voltage drops; this means that both the
electrical design and the board layout must be designed for this current flow.
If the layout of the PCB is not well designed a strong noise floor is generated on the
ground and the supply; this will reflect on all the audio paths producing an audible
annoying noise at 216 Hz; if the voltage drop during the peak current absorption is too
much, then the device may even shutdown as a consequence of the supply voltage drop.
TIP:
TIP: TIP:
TIP:
The electrical design for the Power supply should be made ensuring it will be capable
of a peak current output of at least 2A.