Rainbow Electronics GM862-GPS - Manual (Page 24)

GM862-GPS Hardware User Guide
1vv0300728 Rev. 8 - 20/09/07
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 24 of 73
6 Power Supply
The power supply circuitry and board layout are the most important part in the full product design and
they strongly reflect on the product overall performances, hence read carefully the requirements and
the guidelines that will follow for a proper design.
6.1 Power Supply Requirements
POWER SUPPLY
Nominal Supply Voltage 3.8 V
Max Supply Voltage 4.2 V
Supply voltage range 3.4 V - 4.2 V
CONSUMPTIONS
Mode Average [mA] Mode description
IDLE mode with GPS OFF Stand by mode; no call in progress; GPS OFF
AT+CFUN=1 24,0 Normal mode: full functionality of the module
AT+CFUN=4 22,0 Disabled TX and RX; module is not registered on the network
AT+CFUN=0 or
AT+CFUN=5
7,3 / 3,4 2
Power saving: CFUN=0 module registered on the network and
can receive voice call or an SMS; but it is not possible to send
AT commands; module wakes up with an unsolicited code (call
or SMS) or rising RTS line. CFUN=5 full functionality with power
saving; module registered on the network can receive incoming
calls and SMS
IDLE mode with GPS ON 3 full power mode
Stand by mode; no call in progress; GPS ON AT+CFUN=1 113,0
AT+CFUN=4 111,0
IDLE mode with GPS ON trickle power mode
Stand by mode; no call in progress; GPS consumption reduced
maintaining the NMEA sentences
AT+CFUN=1 64,0
AT+CFUN=4 62,0
IDLE mode with GPS ON push to fix mode
Stand by mode; no call in progress; GPS performs a fix and then
it switches off for the defined period
AT+CFUN=1 24,0
AT+CFUN=4 22,0
AT+CFUN=5 10,0
RX mode
GSM Receiving data mode
1 slot in downlink 53,0
2 slot in downlink 65,0
3 slot in downlink 78,0
4 slot in downlink 91,0
GSM TX and RX mode GPS ON
GSM Sending data mode Min power level 135,0
Max power level 254,0
GPRS (class 10) TX and RX mode GPS ON
GPRS Sending data mode Min power level 187,0
Max power level 430,0
2 Worst/best case depends on network configuration and is not under module control
3 The values reported are with GPS antenna current consumption (22mA) included