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TC65 Hardware Interface Description
Confidential / Released
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TC65_HD_V02.000 Page 44 of 120 08.06.2006
3.5.3 Battery Pack Requirements
The charging algorithm has been optimized for rechargeable Lithium batteries that meet the
characteristics listed below and in
Table 8. It is recommended that the battery pack you want
to integrate into your TC65 application is compliant with these specifications. This ensures
reliable operation, proper charging and, particularly, allows you to monitor the battery
capacity using the AT^SBC command. Failure to comply with these specifications might
cause AT^SBC to deliver incorrect battery capacity values.
• Li-Ion or Lithium Polymer battery pack specified for a maximum charging voltage of 4.2V
and a recommended capacity of 1000 to 1200mAh.
• Since charging and discharging largely depend on the battery temperature, the battery
pack should include an NTC resistor. If the NTC is not inside the battery it must be in
thermal contact with the battery. The NTC resistor must be connected between
BATT_TEMP and GND.
The B value of the NTC should be in the range: 10kΩ +
5% @ 25°C, B
25/85
= 3423K to B
=3435K ± 3% (alternatively acceptable: 10kΩ +
2% @ 25°C, B
25/50
= 3370K +3%). Please
note that the NTC is indispensable for proper charging, i.e. the charging process will not
start if no NTC is present.
• Ensure that the pack incorporates a protection circuit capable of detecting overvoltage
(protection against overcharging), undervoltage (protection against deep discharging)
and overcurrent. Due to the discharge current profile typical of GSM applications, the
circuit must be insensitive to pulsed current.
• On the TC65 module, a built-in measuring circuit constantly monitors the supply voltage.
In the event of undervoltage, it causes TC65 to power down. Undervoltage thresholds
are specific to the battery pack and must be evaluated for the intended model. When you
evaluate undervoltage thresholds, consider both the current consumption of TC65 and
of
the application circuit.
• The internal resistance of the battery and the protection should be as low as possible. It
is recommended not to exceed 150m, even in extreme conditions at low temperature.
The battery cell must be insensitive to rupture, fire and gassing under extreme conditions
of temperature and charging (voltage, current).
• The battery pack must be protected from reverse pole connection. For example, the
casing should be designed to prevent the user from mounting the battery in reverse
orientation.
• It is recommended that the battery pack be approved to satisfy the requirements of CE
conformity.
Figure 9 shows the circuit diagram of a typical
battery pack design that includes the protection
elements described above.
Figure 9: Battery pack circuit diagram
to BATT_TEMP to GND
NTC
Polyfuse
ϑ
Protection Circuit
+
-
Battery cell
to BATT+
- 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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