EGS5 Hardware Interface Description
3.5 Charging Control
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EGS5_HD_v02.004
Page 42 of 123
2012-02-09
Confidential / Released
3.5
Charging Control
EGS5 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 sections contain an overview of charging and specifications. Please refer to
for greater detail, especially regarding requirements for batteries and chargers, appropriate
charging circuits, recommended batteries and an analysis of operational issues typical of bat-
tery powered GSM/GPRS applications.
3.5.1
Hardware Requirements
EGS5 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
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 EGS5 module to correctly determine the end of charg-
ing and terminate charging automatically when the battery is fully charged. If the <current> val-
ue 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 line of the application interface must be added, too.
The parameter <current> is volatile, meaning that the factory default (0 mA) is restored each
time the module is powered down or reset. Therefore, for better control of charging, it is recom-
mended to enter the value every time the module is started.
for details on AT^SBC.