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TC65 Hardware Interface Description
Confidential / Released
s
TC65_HD_V02.000 Page 100 of 120 08.06.2006
5.7.3 Characteristics of Audio Modes
The electrical characteristics of the voiceband part depend on the current audio mode set
with the AT^SNFS command. All values are noted for default gains e.g. all parameters of
AT^SNFI and AT^SNFO are left unchanged.
Table 31: Voiceband characteristics (typical)
Audio mode no.
AT^SNFS=
1 (Default
settings, not
adjustable)
2 3 4 5 6
Name Default
Handset
Basic
Handsfree
Headset User
Handset
Plain
Codec 1
Plain
Codec 2
Purpose DSB with
Votronic
handset
Siemens
Car Kit
Portable
Siemens
Headset
DSB with
individual
handset
Direct access
to speech
coder
Direct access
to speech
coder
Gain setting via AT
command. Defaults:
inBbcGain
outBbcGain
Fix
5 (30dB)
1 (-6dB)
Adjustable
2 (12dB)
2 (-12dB)
Adjustable
5 (30dB)
1 (-6dB)
Adjustable
5 (30dB)
1 (-6dB)
Adjustable
0 (0dB)
0 (0dB)
Adjustable
0 (0dB)
0 (0dB)
Default audio
interface
1 2 2 1 1 2
11
Power supply VMIC ON ON ON ON ON ON
Sidetone Fix --- Adjustable Adjustable Adjustable Adjustable
Volume control Fix Adjustable Adjustable Adjustable Adjustable Adjustable
Echo control
Echo canceller ON ON ON ON OFF OFF
Loss controller
idle/full attenuation
3dB / 6dB 4dB / 50dB 9dB / 18dB 3dB / 6dB OFF OFF
Comfort noise
generator
ON ON ON ON OFF OFF
Non linear processor ON ON ON ON OFF OFF
MIC input signal for
0dBm0
-10dBm0
f=1024 Hz
18mV
5.8mV
---
12
95mV
---
12
14mV
18mV
5.8mV
400mV
126mV
400mV
126mV
EP output signal in
mV rms. @ 0dBm0,
1024 Hz, no load
(default gain) /
@ 3.14 dBm0
475mV 70mV
default @
max volume
270mV
default @
max volume
475mV
default @
max volume
1.47V
Vpp = 6.2 V
1.47V
Sidetone gain at
default settings
21.9dB - dB 10.0dB 21.9dB - dB - dB
NOTE: With regard to acoustic shock, the cellular application must be designed to avoid
sending false AT commands that might increase amplification, e.g. for a highly sensitive
earpiece. A protection circuit should be implemented in the cellular application.
11
Audio mode 5 and 6 are identical. AT^SAIC can be used to switch mode 5 to the second interface. Audio
mode 6 is therefore kept mainly for compatibility to earlier Siemens GSM products.
12
In audio modes with an active loss controller a continuous sine signal is attenuated by the idle attenuation after
a few seconds. All input voltages are noted for the idle attenuation. If the idle attenuation is higher than 3 dB,
0dBm0 cannot be reached without clipping. In this case only the value for -10dBm0 is noted.
- 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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