Siemens TC65 Specifications download pdf (Page 43)

TC65 Hardware Interface Description

Confidential / Released

TC65_HD_V02.000 Page 43 of 120 08.06.2006

3.5 Charging Control

TC65 integrates a charging management for rechargeable Lithium Ion and Lithium Polymer

batteries. You can skip this chapter if charging is not your concern, or if you are not using

the implemented charging algorithm.

The following chapters contain an overview of charging and battery specifications. Please

refer to

[5] for greater detail, especially regarding requirements for batteries and chargers,

appropriate charging circuits, recommended batteries and an analysis of operational issues

typical of battery powered GSM/GPRS applications.

3.5.1 Hardware Requirements

TC65 has no on-board charging circuit. To benefit from the implemented charging

management you are required to install a charging circuit within your application according to

the

Figure 47.

3.5.2 Software Requirements

Use the command AT^SBC, parameter <current>, to enter the current consumption of the

host application. This information enables the TC65 module to correctly determine the end of

charging and terminate charging automatically when the battery is fully charged. If the

<current> value is inaccurate and the application draws a current higher than the final

charge current, either charging will not be terminated or the battery fails to reach its

maximum voltage. Therefore, the termination condition is defined as: current consumption

dependent on operating mode of the ME plus current consumption of the external

application. If used the current flowing over the VEXT pin of the application interface must be

added, too.

The parameter <current> is volatile, meaning that the factory default (0mA) is restored each

time the module is powered down or reset. Therefore, for better control of charging, it is

recommended to enter the value every time the module is started.

See

[1] for details on AT^SBC.

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Siemens TC65 Specifications Page 43