Specifications

MC55/56 Hardware Interface Description
Confidential / Released
s
MC55/56_hd_v04.00a Page 3 of 108 24.08.2006
Contents
0 Document history....................................................................................................... 7
1 Introduction ...............................................................................................................11
1.1 Related documents ............................................................................................11
1.2 Terms and abbreviations....................................................................................12
1.3 Type approval ....................................................................................................15
1.4 Safety precautions .............................................................................................17
2 Product concept........................................................................................................19
2.1 MC55/56 key features at a glance......................................................................20
2.2 Circuit concept ...................................................................................................23
3 Application Interface.................................................................................................24
3.1 Operating modes ...............................................................................................25
3.2 Power supply .....................................................................................................27
3.2.1 Power supply pins on the board-to-board connector.............................27
3.2.2 Minimizing power losses.......................................................................28
3.2.3 Monitoring power supply.......................................................................28
3.3 Power up / down scenarios ................................................................................29
3.3.1 Turn on MC55/56 .................................................................................29
3.3.1.1 Turn on MC55/56 using the ignition line /IGT (Power on) .....................30
3.3.1.2 Timing of the ignition process...............................................................31
3.3.1.3 Turn on MC55/56 using the POWER signal .........................................32
3.3.1.4 Turn on MC55/56 using the RTC (Alarm mode) ...................................32
3.3.2 Turn off MC55/56 .................................................................................34
3.3.2.1 Turn off MC55/56 using AT command..................................................34
3.3.2.2 Emergency shutdown using /EMERGOFF pin......................................35
3.3.3 Automatic shutdown .............................................................................36
3.3.3.1 Thermal shutdown................................................................................36
3.3.3.2 Temperature control during emergency call .........................................37
3.3.3.3 Undervoltage shutdown if battery NTC is present.................................37
3.3.3.4 Undervoltage shutdown if no battery NTC is present............................38
3.3.3.5 Overvoltage shutdown..........................................................................38
3.4 Automatic GPRS Multislot Class change............................................................39
3.5 Charging control.................................................................................................40
3.5.1 Battery pack characteristics..................................................................41
3.5.2 Implemented charging technique..........................................................43
3.5.3 Operating modes during charging ........................................................44
3.5.4 Charger requirements ..........................................................................45
3.6 Power saving .....................................................................................................46
3.6.1 No power saving (AT+CFUN=1)...........................................................46
3.6.2 NON-CYCLIC SLEEP mode (AT+CFUN=0) .........................................46
3.6.3 CYCLIC SLEEP mode (AT+CFUN=5, 6, 7, 8) ......................................47
3.6.4 CYCLIC SLEEP mode AT+CFUN=9 ....................................................47
3.6.5 Timing of the /CTS signal in CYCLIC SLEEP modes ...........................47
3.6.6 Wake up MC55/56 from SLEEP mode .................................................49
3.6.6.1 Wake-up via /RTS0 and RTS1 (if AT+CFUN=0 or AT+CFUN=9) .........50
3.7 Summary of state transitions (except SLEEP mode)..........................................51
3.8 RTC backup.......................................................................................................52
3.9 Serial interfaces .................................................................................................53
3.9.1 Features supported on first and second serial interface .......................54