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TC65 Hardware Interface Description
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TC65_HD_V02.000 Page 45 of 120 08.06.2006
Table 8: Specifications of battery packs suitable for use with TC65
Battery type Rechargeable Lithium Ion or Lithium Polymer battery
Nominal voltage 3.6V / 3.7V
Capacity Recommended: 1000mAh to 1200mAh
Minimum: 500mAh
NTC 10k ± 5% @ 25°C
approx. 5k @ 45°C
approx. 26.2k @ 0°C
B value range: B (25/85)=3423K to B =3435K ± 3%
Overcharge detection voltage 4.325 ± 0.025V
Overdischarge detection voltage 2.5V
Overdischarge release voltage 2.6V
Overcurrent detection 3 ± 0.5A
Overcurrent detection delay time 4 ~ 16ms
Short detection delay time 50µs
Internal resistance <130m
Note: A maximum internal resistance of 150m should not
be exceeded even after 500 cycles and under extreme
conditions.
3.5.4 Charger Requirements
For using the implemented charging algorithm and the reference charging circuit
recommended in
[5] and in Figure 47, the charger has to meet the following requirements:
Output voltage: 5.2Volts ±0.2V (stabilized voltage)
Output current: 500mA
Chargers with a higher output current are acceptable, but please consider
that only 500mA will be applied when a 0.3Ohms shunt resistor is
connected between VSENSE and ISENSE. See
[5] for further detail.
3.5.5 Implemented Charging Technique
If all requirements listed above are met (appropriate external charging circuit of application,
battery pack, charger, AT^SBC settings) then charging is enabled in various stages
depending on the battery condition:
Trickle charging:
• Trickle charge current flows over the VCHARGE line.
• Trickle charging is done when a charger is present (connected to VCHARGE) and the
battery is deeply discharged or has undervoltage. If deeply discharged (Deep Discharge
Lockout at V
BATT+
= <2.5V) the battery is charged with 5mA, in case of undervoltage
(Undervoltage Lockout at V
BATT+
= 2.5…3.2V) it is charged with 30mA.
- 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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