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TC65 Hardware Interface Description

Confidential / Released

TC65_HD_V02.000 Page 99 of 120 08.06.2006

5.7.2 Audio Programming Model

The audio programming model shows how the signal path can be influenced by varying the

AT command parameters. The parameters inBbcGain and inCalibrate can be set with

AT^SNFI. All the other parameters are adjusted with AT^SNFO.

Figure 42: Audio programming model

<mic>

Microphone

feeding

Speech

coder

MIC1

MIC2

Speech

decoder

TXDDAI

RXDDAI

8Ohms

EP1

EP2

32 Ohms

GSM module

<ep>

VMIC

<io>

AT parameters are given in brackets <...>

and marked red and italic.

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 119 120

Hardware Interface Descri 1
Contents 3
Figures 6
0 Document History 7
1 Introduction 10
1.2 Terms and Abbreviations 11
1.3 Type Approval 14
1.4 Safety Precautions 16
2 Product Concept 18
2.2 TC65 System Overview 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 TC65 28
31
Table 6: Signal states 34
3.3.3 Turn off TC65 36
3.3.4 Automatic Shutdown 39
3.3.4.5 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 48
AT interface disabled 49
AT interface enabled 49
3.8 RTC Backup 51
3.9 SIM Interface 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
Figure 29: PCM timing 70
3.17 GPIO Interface 72
3.18 Control Signals 73
3.18.4 PWR_IND Signal 75
4 Antenna Interface 76
Antenna 77
4.2 Antenna Pad 78
4.2.1 Suitable Cable Types 78
4.3 Antenna Connector 79
5.2 Operating Temperatures 84
5.3 Storage Conditions 85
EMRG_RST 89
5.6 Power Supply Ratings 95
5.7.4 Voiceband Receive Path 101
5.8 Air Interface 103
5.9 Electrostatic Discharge 104
6 Mechanics 105
Confidential / Released 106
7 Sample Application 111
8 Reference Approval 113
9 Appendix 115

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