Data Sheet

FSC-BT1006A Datasheet
Shenzhen Feasycom Technology Co.,Ltdwww.feasycom.com
-14-
The picture belowshows the mode-to-mode transition voltages. These voltages are fixed and calibrated. The transition
between modes can occur at any time.
Figure 4:Battery Charger Mode-to-Mode Transition Diagram
Disabled Mode
In the disabled mode the battery charger is fully disabled and draws no active current on any of its terminals.
Trickle Charge Mode
In the trickle charge mode, when the voltage on VBAT_SENSE is lower than the V
fast
threshold, a current of
approximately 10% of the fast charge current, I
fast
, is sourced from the VBAT_IN pin.
The V
fast
threshold detection has hysteresis to prevent the charger from oscillating between modes.
Fast Charge Mode
When the voltage on VBAT_SENSE is greater than V
fast
, the current sourced from the VBAT pin increases to I
fast.
I
fast
is between 10mA and 200mA set by PS Key or a VM trap. In addition, I
fast
is calibrated in production test to correct
for process variation in the charger circuit.
The current is held constant at I
fast
until the voltage at VBAT_SENSE reaches V
float
, then the charger reduces the
current sourced to maintain a constant voltage on the VBAT_SENSE pin.
When the current sourced is below the termination current, I
term
, the charging stops and the charger enters
standby mode. I
term
is typically 10% of the fast charge current.
Standby Mode