User's Manual
Table Of Contents
- Document History
- Introduction
- Product Concept
- Application Interface
- Operating Modes
- Power Supply
- Power Up / Power Down Scenarios
- Automatic GPRS Multislot Class Change
- Charging Control
- Summary of State Transitions (Except SLEEP Mode)
- RTC Backup
- SIM Interface
- Serial Interface ASC0
- Serial Interface ASC1
- USB Interface
- I2C Interface
- Audio Interfaces
- Control Signals
- Antenna Interface
- Electrical, Reliability and Radio Characteristics
- Mechanics
- Sample Application
- Reference Approval
- Appendix
TC63 Hardware Interface Description
Strictly confidential / Draft
s
TC63_HD_V00.432 Page 37 of 97 11.05.2005
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 TC63 module, a built-in measuring circuit constantly monitors the supply voltage.
In the event of undervoltage, it causes TC63 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 TC63 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 8 shows the circuit diagram of a typical battery
pack design that includes the protection elements
described above.
Figure 8: Battery pack circuit diagram
Table 3: Specifications of battery packs suitable for use with TC63
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 2.5 ± 0.05V
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.
to BATT_TEMP to GND
NTC
Polyfuse
ϑ
Protection Circuit
+
-
Battery cell
to BATT+