HSBT3031-08 module_datasheet
Version2.0– Jun. 15
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HANSONG ( NANJING) TECHNOLOGY CO.,LTD
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Figure 8-1 Charge cycle states
Trickle charge
This mode is entered when VBAT is sensed in the range 0 to Vpre. This is encountered only
with a deeply discharged battery (below Vpre threshold, point (A)), or when the cell's battery
protection circuit has opened, temporarily disconnecting the cell. It is used to pass a small
charging current to safely charge a cell, and also cause a cell battery protection circuit to reset.
The hysteresis on Trickle charge into Pre-Charge is typically 100 mV.
During Trickle charge, HSBT3031-08 controls charge current internally. The external pass
transistor is not used.
Parameters in Trickle charge
Pre-charge
This mode is entered when VBAT is sensed in the range Vpre to Vfast. In this range, it is not
recommended to charge the cell at maximum rate, but a faster charge rate than that of Trickle
charge is allowable. Typically this is ~10 % to 20 % of the Fast charge rate. The Vfast
threshold, point (B) is programmable.
The hysteresis on the Vfast transition from Pre-Charge to Fast charge is typically 200 mV.
During Pre-Charge, HSBT3031-08 controls the charge current internally and the external pass
transistor is not used.
Parameters in Pre-charge