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AC75 Hardware Interface Description
Strictly confidential / Preliminary
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
Key Features at a Glance ....................................................................................16
2.2
AC75 System Overview .......................................................................................19
2.3
Circuit Concept ....................................................................................................20
3
Application Interface...................................................................................................21
3.1
Operating Modes .................................................................................................22
3.2
Power Supply.......................................................................................................24
3.2.1
Minimizing Power Losses ......................................................................24
3.2.2
3.2.3
Monitoring Power Supply by AT Command ...........................................25
3.3
Power-Up / Power-Down Scenarios ....................................................................26
3.3.1
Turn on AC75.........................................................................................26
3.3.1.1 Turn on AC75 Using Ignition Line IGT ...................................................26
3.3.1.2 Configuring the IGT Line for Use as ON/OFF Switch ............................29
3.3.1.3 Turn on AC75 Using the VCHARGE Signal...........................................30
3.3.1.4 Reset AC75 via AT+CFUN Command...................................................30
3.3.1.5 Reset or Turn off AC75 in Case of Emergency......................................31
...............................................................................................................31
3.3.2
Signal States after Startup .....................................................................32
3.3.3
Turn off AC75.........................................................................................34
3.3.3.1 Turn off AC75 Using AT Command .......................................................34
3.3.3.2 Leakage Current in Power-Down Mode.................................................35
3.3.3.3 Turn on/off AC75 Applications with Integrated USB ..............................36
3.3.4
Automatic Shutdown ..............................................................................37
3.3.4.1 Thermal Shutdown.................................................................................37
3.3.4.2 Deferred Shutdown at Extreme Temperature Conditions ......................38
3.3.4.3 Monitoring the Board Temperature of AC75 ..........................................38
3.3.4.4 Undervoltage Shutdown if Battery NTC is Present ................................38
3.3.4.5 Undervoltage Shutdown if no Battery NTC is Present ...........................39
3.3.4.6 Overvoltage Shutdown...........................................................................39
3.4
Automatic EGPRS/GPRS Multislot Class Change ..............................................40
3.5
Charging Control..................................................................................................41
3.5.1
Hardware Requirements ........................................................................41
3.5.2
Software Requirements .........................................................................41
3.5.3
Battery Pack Requirements ...................................................................42
3.5.4
Batteries Recommended for Use with AC75 .........................................43
3.5.5
Charger Requirements...........................................................................44
3.5.6
Implemented Charging Technique.........................................................44
3.5.7
Operating Modes during Charging.........................................................45
3.6
Power Saving.......................................................................................................47
3.6.1
Network Dependency of SLEEP Modes ................................................47
3.6.2
Timing of the CTSx Signal in CYCLIC SLEEP Mode 7..........................48
3.6.3
Timing of the RTSx Signal in CYCLIC SLEEP Mode 9..........................48
AC75_HD_V00.202
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BATT+
Page 3 of 120
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27.04.2006
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