Name: Siemens TC65
Brand: Siemens
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Default Chapter3

Table of Contents3

Document History7

1 Introduction8

2 Product Concept16

3 Application Interface21

Operating Modes22
Table 1: Overview of Operating Modes22
Power Supply24
- Minimizing Power Losses24
- Monitoring Power Supply by at Command25
- Measuring the Supply Voltage V25
- Batt25
- Figure 3: Power Supply Limits During Transmit Burst25
- Figure 4: Position of the Reference Points BATT+ and GND25
Power up / Power down Scenarios26
- Turn on TC6526
- Turn on TC65 Using Ignition Line IGT26
- Figure 5: Power-On with Operating Voltage at BATT+ Applied before Activating IGT27
- Turn on TC65 Using the VCHARGE Signal28
- Figure 6: Power-On with IGT Held Low before Switching on Operating Voltage at BATT28
- Reset TC65 Via AT+CFUN Command29
- Reset or Turn off TC65 in Case of Emergency29
- Turn off TC6530
- Turn off TC65 Using at Command30
- Leakage Current in Power down Mode31
- Figure 7: Signal States During Turn-Off Procedure31
- Automatic Shutdown32
- Temperature Dependent Shutdown32
- Temperature Control During Emergency Call33
- Undervoltage Shutdown if Battery NTC Is Present33
- Table 2: Temperature Dependent Behavior33
- Undervoltage Shutdown if no Battery NTC Is Present34
- Overvoltage Shutdown34
Automatic GPRS Multislot Class Change35
Charging Control36
- Hardware Requirements36
- Software Requirements36
- Battery Pack Requirements37
- Figure 8: Battery Pack Circuit Diagram37
- Batteries Recommended for Use with TC6538
- Table 3: Specifications of Battery Packs Suitable for Use with TC6538
- Charger Requirements39
- Implemented Charging Technique39
- Operating Modes During Charging40
- Table 4: Comparison Charge-Only and Charge Mode41
- Table 5: at Commands Available in Charge-Only Mode41
Summary of State Transitions (Except SLEEP Mode)42
Table 6: State Transitions of TC65 (Except SLEEP Mode)42
RTC Backup43
Figure 9: RTC Supply from Capacitor43
Figure 10: RTC Supply from Rechargeable Battery43
Figure 11: RTC Supply from Non-Chargeable Battery43
SIM Interface44
Table 7: Signals of the SIM Interface (Board-To-Board Connector)44
Serial Interface ASC045
Figure 12: Serial Interface ASC045
Table 8: DCE-DTE Wiring of ASC046
Serial Interface ASC147
Figure 13: Serial Interface ASC1 (if Java Is Not Used)47
Table 9: DCE-DTE Wiring of ASC148
USB Interface49
- Figure 14: USB Circuit49
- Installing the USB Modem Driver50
I 2 C Interface52
Figure 15: I2C Interface Connected to VCC of Application52
Figure 16: I2C Interface Connected to VEXT Line of TC6553
Audio Interfaces54
- Figure 17: Audio Block Diagram54
- Figure 18: Single Ended Microphone Input55
- Microphone Circuit55
- Single-Ended Microphone Input55
- Speech Processing55
- Differential Microphone Input56
- Figure 19: Differential Microphone Input56
- Figure 20: Line Input Configuration with Opamp57
- Line Input Configuration with Opamp57
- Figure 21: Differential Loudspeaker Configuration58
- Figure 22: Single Ended Loudspeaker Configuration58
- Loudspeaker Circuit58
- Digital Audio Interface DAI59
- Figure 23: PCM Interface Application59
- Table 10: Overview of DAI Pin Functions59
- Figure 24: PCM Timing60
Control Signals61
- Synchronization Signal61
- Figure 25: SYNC Signal During Transmit Burst61
- Using the SYNC Pin to Control a Status LED62
- Figure 26: LED Circuit (Example)62

4 Antenna Interface63

5 Electrical, Reliability and Radio Characteristics70

6 Mechanics82

7 Sample Application88

Figure 38: TC65 Sample Application for Java (Draft)89

8 Reference Approval90

9 Appendix92

Manufacturer	Siemens
Operating Temperature	-20°C to +55°C
Power Supply	3.3 V to 4.8 V
Communication Interfaces	RS232, USB
GPRS	Class 10
SIM card	3V/1.8V
Protocols	TCP/IP, HTTP, SMTP, POP3

Siemens TC65 User Manual

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