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AC65/AC75 Hardware Interface Description

Confidential / Preliminary

AC65/AC75_hd_v00.372 Page 68 of 118 2006-08-03

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 ... 117 118

Hardware Interface Descri 1
Contents 3
Figures 6
0 Document History 7
1 Introduction 9
1.2 Terms and Abbreviations 10
1.3 Type Approval 13
1.4 Safety Precautions 16
2 Product Concept 18
Interface 21
Diagnostic 21
2.3 Circuit Concept 22
3 Application Interface 23
3.1 Operating Modes 24
3.2 Power Supply 26
3.3.1 Turn on AC65/AC75 28
31
Table 6: Signal states 34
3.3.3 Turn off AC65/AC75 36
3.3.4 Automatic Shutdown 39
3.3.4.6 Overvoltage Shutdown 41
3.5 Charging Control 43
3.5.1 Hardware Requirements 43
3.5.2 Software Requirements 43
3.5.4 Charger Requirements 45
3.6 Power Saving 49
AT interface disabled 50
AT interface enabled 50
3.8 RTC Backup 52
3.9 SIM Interface 53
3.9.1 Installation Advice 54
3.10 Serial Interface ASC0 55
3.11 Serial Interface ASC1 57
3.12 USB Interface 58
C Interface 59
3.14 SPI Interface 61
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
5.6 Power Supply Ratings 93
5.8 Air Interface 101
5.9 Electrostatic Discharge 102
6 Mechanics 103
Confidential / Preliminary 104
7 Sample Application 109
8 Reference Approval 111
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

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