Siemens TC65 Specifications Page 31
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TC65 Hardware Interface Description
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TC65_HD_V02.000 Page 31 of 120 08.06.2006
3.3.1.2 Configuring the IGT Line for Use as ON/OFF Switch
The IGT line can be configured for use in two different switching modes: You can set the IGT
line to switch on the module only, or to switch it on and off. The switching mode is
determined by the parameter “MEShutdown/OnIgnition” of the AT^SCFG command. This
approach is useful for application manufacturers who wish to have an ON/OFF switch
installed on the host device.
By factory default, the ON/OFF switch mode of IGT is disabled:
at^scfg=meshutdown/onignition
^SCFG: "MEShutdown/OnIgnition","off"
OK
# Query the current status of IGT.
# IGT can be used only to switch on TC65.
IGT works as described in Chapter 3.3.1.1.
To configure IGT for use as ON/OFF switch:
at^scfg=meshutdown/onignition,on
^SCFG: "MEShutdown/OnIgnition","on"
OK
# Enable the ON/OFF switch mode of IGT.
# IGT can be used to switch on and off TC65.
We strongly recommend taking great care before changing the switching mode of the IGT
line. To ensure that the IGT line works properly as ON/OFF switch it is of vital importance
that the following conditions are met.
Switch-on condition: If the TC65 is off, the IGT line must be asserted for at least 400ms
before being released. The module switches on after 400ms.
Switch-off condition: If the TC65 is on, the IGT line must be asserted for at least 1s before
being released. The module switches off after the line is released.
The switch-off routine is identical with the procedure initiated by
AT^SMSO, i.e. the software performs an orderly shutdown as
described in Chapter
3.3.3.1.
Before switching off the module wait at least 2 seconds after startup.
ON OFF
~~~~
|________|
~~~~~~~~~~~~~
|________|
~~~~
| 0.4s | 2s | 1s |
Figure 7: Timing of IGT if used as ON/OFF switch
- 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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