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TC65 Hardware Interface Description
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TC65_HD_V02.000 Page 63 of 120 08.06.2006
3.15 Audio Interfaces
TC65 comprises three audio interfaces available on the board-to-board connector:
• Two analog audio interfaces, both with balanced or single-ended inputs/outputs.
• Serial digital audio interface (DAI) designed for PCM (Pulse Code Modulation).
This means you can connect up to three different audio devices, although only one interface
can be operated at a time. Using the AT^SAIC command you can easily switch back and
forth.
Analog switch
Digital
Audio
Interface
Air
Interface
DSP
MUX
MU
X
D
A
MICN2
MICP2
MICN1
MICP1
DAI6
DAI5
DAI4
DAI3
DAI2
AGND
DAI0
DAI1
D
A
EPP2
EPN2
EPP1
EPN1
VMIC
MUX
Figure 23: Audio block diagram
To suit different types of accessories the audio interfaces can be configured for different
audio modes via the AT^SNFS command. The electrical characteristics of the voiceband part
vary with the audio mode. For example, sending and receiving amplification, sidetone paths,
noise suppression etc. depend on the selected mode and can be altered with AT commands
(except for mode 1).
Both analog audio interfaces can be used to connect headsets with microphones or
speakerphones. Headsets can be operated in audio mode 3, speakerphones in audio
mode 2. Audio mode 5 can be used for direct access to the speech coder without signal pre
or post processing.
When shipped from factory, all audio parameters of TC65 are set to interface 1 and audio
mode 1. This is the default configuration optimized for the Votronic HH-SI-30.3/V1.1/0
handset and used for type approving the Siemens reference configuration. Audio mode 1
has fix parameters which cannot be modified. To adjust the settings of the Votronic handset
simply change to another audio mode.
- 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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