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AC75 Hardware Interface Description

Strictly confidential / Preliminary

AC75_HD_V00.202 Page 68 of 120 27.04.2006

3.15.3 Loudspeaker Circuit

The GSM module comprises two analog speaker outputs: EP1 and EP2. Output EP1 is able

to drive a load of 8Ohms while the output EP2 can drive a load of 32Ohms. Each interface

can be connected in differential and in single ended configuration.

Figure 27 shows an

example of a differential loudspeaker configuration.

GSM module

AGND

EPNx

EPPx

Figure 27: Differential loudspeaker configuration

Loudspeaker impedance

EPP1/EPN1

= typ. 8Ohm

EPP2/EPN2

= typ. 32Ohm

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 119 120

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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Siemens AC75 Specifications Page 68

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