User's Manual

MC46 Hardware Interface Description
DRAFT
MC46_HD_V02.8xb Page 3 of 98 21.08.2003
Contents
0 Document History ...................................................................................................... 7
1 Introduction ................................................................................................................ 8
1.1 Related documents ............................................................................................. 8
1.2 Terms and abbreviations..................................................................................... 9
1.3 Type approval ....................................................................................................12
1.4 Safety precautions .............................................................................................14
2 Product concept........................................................................................................16
2.1 MC46 key features at a glance...........................................................................17
2.2 Circuit concept ...................................................................................................20
3 Application Interface.................................................................................................21
3.1 Operating modes ...............................................................................................22
3.2 Power supply .....................................................................................................24
3.2.1 Power supply pins on the board-to-board connector.............................24
3.2.2 Minimizing power losses.......................................................................25
3.2.3 Monitoring power supply.......................................................................25
3.3 Power up / down scenarios ................................................................................26
3.3.1 Turn on MC46 ......................................................................................26
3.3.1.1 Turn on MC46 using the ignition line /IGT (Power on)...............27
3.3.1.2 Timing of the ignition process ...................................................28
3.3.1.3 Turn on MC46 using the POWER signal...................................29
3.3.1.4 Turn on MC46 using the RTC (Alarm mode).............................29
3.3.2 Turn off MC46 ......................................................................................31
3.3.2.1 Turn off MC46 using AT command ...........................................31
3.3.2.2 Maximum number of turn-on / turn-off cycles ............................32
3.3.2.3 Emergency shutdown using /EMERGOFF pin...........................32
3.3.3 Automatic shutdown .............................................................................33
3.3.3.1 Temperature dependent shutdown............................................33
3.3.3.2 Temperature control during emergency call ..............................34
3.3.3.3 Undervoltage shutdown if battery NTC is present .....................34
3.3.3.4 Undervoltage shutdown if no battery NTC is present ................35
3.3.3.5 Overvoltage shutdown ..............................................................35
3.4 Automatic GPRS Multislot Class change............................................................35
3.5 Charging control.................................................................................................36
3.5.1 Battery pack characteristics..................................................................37
3.5.1.1 Recommended battery pack .....................................................38
3.5.2 Implemented charging technique..........................................................39
3.5.3 Operating modes during charging ........................................................40
3.5.4 Charger requirements ..........................................................................41
3.6 Power saving .....................................................................................................42
3.6.1 No power saving (AT+CFUN=1)...........................................................42
3.6.2 NON-CYCLIC SLEEP mode (AT+CFUN=0) .........................................42
3.6.3 CYCLIC SLEEP mode (AT+CFUN=5, 6, 7 and 8) ................................43
3.6.4 Timing of the /CTS signal in CYCLIC SLEEP modes ...........................43
3.6.5 Wake up MC46 from SLEEP mode ......................................................45
3.7 Summary of state transitions (except SLEEP mode)..........................................46
3.8 RTC backup.......................................................................................................47
3.9 Serial interfaces .................................................................................................48