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5.7 Battery Charging Input (CHG_IN)
Pin Name Direction Function
11 CHG_IN Input Battery charger power
For battery powered applications, the GS64 provides a charge input (CHG_IN) pin to
aid and support battery charging. A typical application would power the wireless
modem directly from a battery source connected to VCC (pins 2, 4, 6, 8, 10) then
provide a dc power source to the CHG_IN connection (pin 11). The GS64 can control
an internal switching FET which creates a charging pathway to the battery. While
power is provided at CHG_IN, the battery charge can be maintained. If the power
should fail or be removed at CHG_IN, the application will be supported by the battery
alone. When CHG_IN voltage returns, the battery charging and maintenance will
commence once more.
The GS64 module supports only one mode of charging, microprocessor supervised
pulsed-charging. Also, the module only supports one battery cell type as standard.
Users may, if they wish, develop charging algorithms and control through the Sony
Ericsson M2mpower Embedded Applications. Users wishing to attempt charging of
battery types not supported by the standard type, indicated in this document, do so
at their own risk.
Battery charging algorithms are unique to different battery types. Sony
Ericsson Mobile Communications will not accept any responsibility or
liability for damage, product failures, even death or injury occurring as
a result of incompatible battery and charging algorithms being
applied.
Safety considerations must be taken into account when using the battery charge
function of the GS64; for example, monitoring the temperature of the battery. If the
temperature of the battery exceeds its specification limits, battery charging must be
stopped immediately. If the battery temperature continues to rise the application
should be suspended or the battery disconnected. Battery temperature can be
monitored with a suitable detection circuit, using the GS64 ADC inputs.
When charging Lithium batteries, the battery pack must have an
internal protection circuit in accordance with the manufacturer's
instructions.
DANGE
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CAUTION