User Manual

Table Of Contents
XT55/56 Hardware Interface Description
Confidential / Preliminary
s
XT55/56_hd_v02.96 Page 3 of 125 18.08.2005
Contents
0 Document History .........................................................................................................8
1 Introduction .................................................................................................................11
1.1 Supported Software and Hardware Releases .....................................................11
1.2 Related Documents .............................................................................................12
1.3 Terms and Abbreviations.....................................................................................13
1.4 Type Approval......................................................................................................17
1.5 Safety Precautions...............................................................................................19
2 Product Concept .........................................................................................................21
2.1 XT55/56 Key Features at a Glance .....................................................................22
2.2 Circuit Concept ....................................................................................................25
3 GSM Application Interface .........................................................................................27
3.1 GSM/GPRS Operating Modes.............................................................................27
3.2 Power Supply.......................................................................................................29
3.2.1 Power Supply Pins on the Board-to-Board Connector...........................29
3.2.2 Minimizing Power Losses ......................................................................30
3.2.3 Monitoring Power Supply .......................................................................30
3.3 Power Up / Down Scenarios................................................................................31
3.3.1 Turn on the GSM Part of XT55/56 .........................................................31
3.3.1.1 Turn on the GSM Part of XT55/56 Using the Ignition Line GSM_IGT
(Power on) .............................................................................................32
3.3.1.2 Timing of the Ignition Process................................................................33
3.3.1.3 Turn on the GSM Part of XT55/56 Using the GSM_POWER Signal .....34
3.3.1.4 Turn on the GSM Part of XT55/56 Using the RTC (Alarm Mode)..........34
3.3.2 Turn off the GSM Part of XT55/56 .........................................................35
3.3.2.1 Turn off GSM Part of the XT55/56 Module Using AT^SMSO ................36
3.3.2.2 Emergency Shutdown Using GSM_EMERGOFF Pin............................37
3.3.3 Automatic Shutdown ..............................................................................38
3.3.3.1 Temperature Dependent Shutdown.......................................................38
3.3.3.2 Temperature Control during Emergency Call ........................................39
3.3.3.3 Undervoltage Shutdown if Battery NTC is Present ................................39
3.3.3.4 Undervoltage Shutdown if no Battery NTC is Present ...........................40
3.3.3.5 Overvoltage Shutdown...........................................................................40
3.4 Automatic GPRS Multislot Class Change............................................................41
3.5 Charging Control of the GSM Part.......................................................................42
3.5.1 Battery Pack Characteristics..................................................................44
3.5.2 Recommended Battery Pack Specification............................................45
3.5.3 Implemented Charging Technique.........................................................46
3.5.4 Operating Modes during Charging.........................................................48
3.5.5 Charger Requirements...........................................................................49
3.6 Power Saving.......................................................................................................50
3.6.1 No Power Saving (AT+CFUN=1) ...........................................................50
3.6.2 NON-CYCLIC SLEEP Mode (AT+CFUN=0)..........................................50
3.6.3 CYCLIC SLEEP Mode (AT+CFUN=5, 6, 7, 8) .......................................51
3.6.4 CYCLIC SLEEP Mode AT+CFUN=9 .....................................................51
3.6.5 Timing of the GSM_CTS Signal in CYCLIC SLEEP Modes ..................51
Wake up XT55/56 from SLEEP Mode .................................................................53
3.6.5.1 Wake-up via /RTS0 and RTS1 (if AT+CFUN=0 or AT+CFUN=9)..........54
3.7 Summary of State Transitions (Except SLEEP Mode).........................................55