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AC75 Hardware Interface Description
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AC75_HD_V00.202 Page 20 of 120 27.04.2006
2.3 Circuit Concept
Figure 1 shows a block diagram of the AC75 module and illustrates the major functional
components:
Baseband block:
• Digital baseband processor with DSP
• Analog processor with power supply unit (PSU)
• Flash / SRAM (stacked)
• Application interface (board-to-board connector)
• Antenna diagnostic
RF section:
• RF transceiver
• RF power amplifier
• RF front end
• Antenna connector
Digital Baseband
Processer with DSP
BATT+
GND
IGT
EMERG_RST
ASC(0)
5
SIM Interface
CCIN
CCRST
CCIO
CCCLK
CCVCC
D(0:15)
A(0:24)
RD; WR; CS; WAIT
RF Control Bus
Interface
RF - Baseband
NTC
BATT_TEMP
VDDLP
SYNC
Transceiver
RF Power
Amplifier
SRAM
Flash
6
5
8
8
AC75
I / Q
4
Audio analog
DAC_OUT
10
USB
GPIO
3
10
I2C/SPI
SPI
2
2
VEXT
ISENSE
VSENSE
VCHARGE
CHARGEGATE
3
RESET
BATTYPE
TEMP2
REFCHG
ASC(1)
4
26MHz
Front End
DAI
7
PWR_IND
Measuring
Network
32.768kHz
26MHz
RTC
Application Interface (80 pin)
RF-Part
Analog
Controller
with PSU
Reset
Antenna
Diagnostic
ADC
Figure 2: AC75 block diagram
- Hardware Interface Descri 1
- Contents 3
- Figures 6
- 0 Document History 7
- 1 Introduction 8
- 1.2 Terms and Abbreviations 9
- 1.3 Type Approval 12
- 1.4 Safety Precautions 14
- 2 Product Concept 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
- 3.3.1 Turn on AC75 26
- 29
- Device(s) 31
- Table 6: Signal states 32
- 3.3.3 Turn off AC75 34
- 3.3.4 Automatic Shutdown 37
- 3.3.4.6 Overvoltage Shutdown 39
- 3.5 Charging Control 41
- 3.5.1 Hardware Requirements 41
- 3.5.2 Software Requirements 41
- 3.5.5 Charger Requirements 44
- 3.6 Power Saving 47
- AT interface disabled 48
- AT interface enabled 48
- 3.8 RTC Backup 50
- 3.9 SIM Interface 51
- 3.9.1 Installation Advice 52
- 3.10 Serial Interface ASC0 53
- 3.11 Serial Interface ASC1 55
- 3.12 USB Interface 56
- C Interface 59
- Figure 20: I 60
- 3.14 SPI Interface 61
- SPI MODE 0 SPI MODE 1 62
- SPI MODE 2 SPI MODE 3 62
- Clock phase 62
- Clock polarity 62
- 3.15 Audio Interfaces 63
- 3.15.1 Speech Processing 64
- 3.15.2 Microphone Circuit 64
- GSM module 68
- 3.15.4.1 Master Mode 70
- 3.15.4.2 Slave Mode 72
- 3.16 GPIO Interface 74
- Transmit burst 75
- 1 Tx 577 µs every 4.616 ms 75
- 2 Tx 1154 µs every 4.616 ms 75
- SYNC signal 75
- 3.17.4 PWR_IND Signal 77
- 4 Antenna Interface 78
- 4.1 Antenna Diagnostic 79
- 4.2 Antenna Connector 80
- 5.2 Operating Temperatures 83
- 5.3 Storage Conditions 84
- Table 26: Signal description 87
- EMRG_RST 88
- I2CDAT_SPIDO I/O V 91
- 5.6 Power Supply Ratings 93
- 2Tx / 3Rx 94
- 5.7.4 Voiceband Receive Path 99
- 5.8 Air Interface 101
- 5.9 Electrostatic Discharge 102
- 6 Mechanics 103
- All dimensions in mm 104
- 7 Sample Application 109
- 8 Reference Approval 111
- granted to Siemens AG 112
- FCC identifier QIPAC75 112
- IC: 267W-AC75 112
- 9 Appendix 113
- Spacer - Aluminum / 115
- Wall thickness = 0.8mm 115
- Insulating Spacer for M2 116
- Self-gripping 116
- External thread at both ends 116
- Hexagon Nut 118
- DIN 934 - ISO 4032 118
- Figure 48: Lithium 119
- Ion battery from 119
- Figure 49: VARTA 120
- PoLiFlex® Lithium 120
- Polymer battery 120
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