User's Manual

MC55/56 Hardware Interface Description
Confidential / Preliminary
s
MC55/56_hd_v03.00 Page 3 of 104 16.08.2005
Contents
0 Document history..........................................................................................................7
1 Introduction ...................................................................................................................9
1.1 Related documents................................................................................................9
1.2 Terms and abbreviations .....................................................................................10
1.3 Type approval ......................................................................................................13
1.4 Safety precautions ...............................................................................................15
2 Product concept..........................................................................................................17
2.1 MC55/56 key features at a glance .......................................................................18
2.2 Circuit concept .....................................................................................................21
3 Application Interface...................................................................................................22
3.1 Operating modes .................................................................................................23
3.2 Power supply .......................................................................................................25
3.2.1 Power supply pins on the board-to-board connector .............................25
3.2.2 Minimizing power losses........................................................................26
3.2.3 Monitoring power supply........................................................................26
3.3 Power up / down scenarios..................................................................................27
3.3.1 Turn on MC55/56 ...................................................................................27
3.3.1.1 Turn on MC55/56 using the ignition line /IGT (Power on)......................28
3.3.1.2 Timing of the ignition process ................................................................29
3.3.1.3 Turn on MC55/56 using the POWER signal ..........................................30
3.3.1.4 Turn on MC55/56 using the RTC (Alarm mode) ....................................30
3.3.2 Turn off MC55/56 ...................................................................................32
3.3.2.1 Turn off MC55/56 using AT command ...................................................32
3.3.2.2 Emergency shutdown using /EMERGOFF pin.......................................33
3.3.3 Automatic shutdown...............................................................................34
3.3.3.1 Temperature dependent shutdown ........................................................34
3.3.3.2 Temperature control during emergency call ..........................................35
3.3.3.3 Undervoltage shutdown if battery NTC is present .................................35
3.3.3.4 Undervoltage shutdown if no battery NTC is present ............................36
3.3.3.5 Overvoltage shutdown ...........................................................................36
3.4 Automatic GPRS Multislot Class change.............................................................37
3.5 Charging control ..................................................................................................38
3.5.1 Battery pack characteristics...................................................................39
3.5.2 Implemented charging technique...........................................................41
3.5.3 Operating modes during charging..........................................................42
3.5.4 Charger requirements ............................................................................43
3.6 Power saving .......................................................................................................44
3.6.1 No power saving (AT+CFUN=1) ............................................................44
3.6.2 NON-CYCLIC SLEEP mode (AT+CFUN=0)..........................................44
3.6.3 CYCLIC SLEEP mode (AT+CFUN=5, 6, 7, 8) .......................................45
3.6.4 CYCLIC SLEEP mode AT+CFUN=9 .....................................................45
3.6.5 Timing of the /CTS signal in CYCLIC SLEEP modes ............................45
3.6.6 Wake up MC55/56 from SLEEP mode ..................................................47
3.6.6.1 Wake-up via /RTS0 and RTS1 (if AT+CFUN=0 or AT+CFUN=9)..........48
3.7 Summary of state transitions (except SLEEP mode)...........................................49
3.8 RTC backup.........................................................................................................50
3.9 Serial interfaces ...................................................................................................51
3.9.1 Features supported on first and second serial interface........................52