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 38 of 97 11.05.2005
3.5.4 Batteries Recommended for Use with TC63
When you choose a battery for your TC63 application you can take advantage of one of the
following two batteries offered by VARTA Microbattery GmbH. Both batteries meet all
requirements listed above. They have been thoroughly tested by Siemens, proved to be
suited for TC63, and are CE approved.
• LIP 633450A1B PCM.STB, type Lithium Ion
This battery is listed in the standard product range of VARTA. It is incorporated in a
shrink sleeve and has been chosen for integration into the reference setup submitted for
Type Approval of Siemens GSM modules.
• LPP 503759CA PCM.NTC.LT50, type Lithium Polymer
This battery has been especially designed by VARTA for use with Siemens GSM
modules. It has the same properties as the above Li-Ion battery, except that it is type
Polymer, is smaller and comes without casing.
Specifications, construction drawings and sales contacts for both VARTA batteries can be
found in Section 9.3.
3.5.5 Charger Requirements
For using the implemented charging algorithm and the reference charging circuit
recommended in [4] and in Figure 38, 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 [4] for
further details.
3.5.6 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+
= 0…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
Software controlled charging:
• Controlled over the CHARGEGATE.
• Temperature conditions: 0°C to 45°C
• Software controlled charging is done when the charger is present (connected to
VCHARGE) and the battery voltage is at least above the undervoltage threshold.
Software controlled charging passes the following stages:
- Power ramp: Depending on the discharge level of the battery (i.e. the measured battery
voltage V
BATT+
) the software adjusts the maximum charge current for charging the
battery. The duration of power ramp charging is very short (less than 30 seconds).