GR47/48 Design Guidelines
BA/SEM/MS 03:0015 Rev A
LZT 123 7596
20
3.9 Battery charging
For battery powered applications, the GR47 has a connection to aid and
support battery charging. The typical design where this may be
applicable is for the customer to power the module directly from a
battery source connected to VCC (pins 1, 3, 5, 7, 9) and to provide a 5V
dc power source (600mA max) to the CHG_IN connection (pin 11).
The module 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.
Battery charging algorithms are unique to different battery types.
SEM
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 without their prior
knowledge and consent.
Further safety considerations should be made such as 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.
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