Telit Wireless Solutions 1vv0300773a GSM Power Supply Requirements, AT+CFUN=1, AT+CFUN=4

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GE863-PRO3Hardware User Guide

1vv0300773a Rev. 0 - 24/01/08

5 Power Supply

The power supply circuitry and board layout are a very 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.

In the GE863-PRO3the power supply inputs of the GSM/GPRS engine and the ARM processor part have been kept separate, VBATT is the input for the GSM/GPRS part, VBATT2 is the input for ARM. It is possible to connect together the two power inputs since they have compatible ranges, but if it is desired the two power supplies can be kept separate.

The only power supply in common between the ARM and GSM/GPRS engine is the RTC voltage which is generated by the GSM/GPRS engine from VBATT power source and supplies both the GSM RTC and the ARM VDDBU part including the shutdown controller, RTC, 32 KHz oscillator. For this reason if it is planned to remove VBATT power supply, then a backup battery shall be provided on VTRC pin that guarantees that VRTC is still available.

NOTE: if you plan to remove VBATT power source, then you must provide an appropriate backup battery/capacitor on the VRTC pin in order to be able to turn on properly the ARM part when supplying VBATT2 only power pin.

5.1 GSM 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

GE863-PRO3GSM Engine

Mode

Average (mA)

 

IDLE mode

AT+CFUN=1

24,0

AT+CFUN=4

22,0

 

 

AT+CFUN=0 or

7,20 / 3,561

AT+CFUN=5

 

 

 

 

RX mode

1 slot in downlink

53,0

2 slot in downlink

66,0

3 slot in downlink

79,0

4 slot in downlink

89,0

Mode description

Stand by mode; no call in progress

Normal mode: full functionality of the module

Disabled TX and RX; module is not registered on the network

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

GSM Receiving data mode

1Worst/best case depends on network configuration and is not under module control

Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved

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Contents GE863-PRO3Hardware User Guide Contents GE863-PRO 3 Hardware User Guide This document is relating to the following products Disclaimer Overview Length 41,4 mm Width 31,4 mm Thickness 3,6 mm GE863-PRO3Mechanical DimensionsTelit GE863-PRO3module overall dimension are GE863-PRO3module connections D10 GND D11 Simvcc D12 Simclk E1 GND E2 Pwrmon DTE GPIO7 / Rftxdisable GSMC2 Vbatt C3 Vrtc C11 Simrst C12 Simio D1 Charge D2 VAUX1ON/OFF*-AP Nrst Reset ARMPB8 PB9PB7 PB0PB2 PB1PA3 HdmbXIN32 XOUT32Reserved GND VBATT2Balls Layout ARM PIO Controller a multiplexing ARM Port IO multiplexingARM PIO Controller B multiplexing ARM PIO Controller C multiplexing Turning on the GE863-PRO3GSM/GPRS Engine Hardware Commands+1,8/5 10kHardware shutdown Hardware Unconditional Reboot of GSM/GPRS Engine2Turning OFF the GE863-PRO3GSM/GPRS Engine Turning ON/OFF the GE863-PRO3ARM ON/OFF*-AP # GND AT+CFUN=4 Power SupplyGSM Power Supply Requirements AT+CFUN=1Vrtc Backup supply ARM Power Supply Requirements817A19A Seiko General Design RulesElectrical design Guidelines Suggested circuit is1.1 + 5V input Source Power Supply Design Guidelines 1.2 + 12V input Source Power Supply Design Guidelines Battery Source Power Supply Design Guidelines Battery Charge control Circuitry Design Guidelines GE863-PRO3Hardware User Guide Thermal Design Guidelines Power Supply PCB layout Guidelines GSM Antenna Requirements Antenna50 ohm GSM Antenna PCB line GuidelinesElectro Magnetic Interference Guidelines GSM Antenna installation GuidelinesOperating Range Interface levels Cmos Level Min Max Logic level specificationsAbsolute Maximum Ratings -Not Functional Parameter Min Max Operating Range Interface levels Cmos Vrtc Level Min Max GSM Gpio Current characteristics Level TypicalCmos 3.1V Current characteristics Level Typical Cmos 1.8V-A Current characteristics Level TypicalSignal Min Max Signal FunctionPhone reset Modem Serial Port Modem Serial Port 2 Debug Serial PortsSignals of the GE863-PRO3GSM/GPRS engine serial port are RS232 level translation An example of level translation circuitry of this kind is GE863-PRO3Hardware User Guide Audio Section Overview Short description Input Lines MicrophoneMicmt 1st differential microphone path Input Lines CharacteristicsOutput Lines Speaker Earmt Differential Line-out Drivers Path Output Lines CharacteristicsEvaluation Kit for Telit GE863- PRO3 Modules ON/OFF 10 GSM/GPRS General Purpose I/O10.4Using the Rftxmon Output GPIO3 Using a Gpio Pad as InputUsing a Gpio Pad as Output Using the RF Transmission Control GPIO7Using the Buzzer Output GPIO4 Using the Alarm OutputDevice Status 10.7Indication of network service availabilityLED status RTC Bypass out 10.9VAUX1 power outputOperating Range VAUX1 power supply PCB pad Design Mounting the GE863-PRO3on the Application Board11.1General StencilSolder paste Following is the recommended solder reflow profile 11.1.4 GE863-PRO3Solder Reflow3C/second max Section A-A Packing SystemModules orientation on tray Moisture Sensibility Conformity Assessment Issues Safety Recommandations Revision Date Changes Document Change Log

1vv0300773a specifications

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