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SS4003 Datasheet(PDF) 6 Page - Silicon Standard Corp.

Part No. SS4003
Description  Smart Battery Power Management
Download  10 Pages
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Maker  SSC [Silicon Standard Corp.]
Homepage  http://www.siliconstandard.com

SS4003 Datasheet(HTML) 6 Page - Silicon Standard Corp.

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2/01/2005 Rev.1.01
Trickle Charge
CC Charge
CV Charge
Voltage Thresholds
In conjunction with monitoring the voltage at pin I for charge/discharge currents, the SS4003 monitors
the battery potential through the pin V. The voltage potential is determined through a resistor-divider
network on tips of cells. The battery voltage is obtained by measuring the input voltages on tips of cells
and dividing factors stored in a ROM. The cell voltages are monitored for the battery low (PLV)
protection, battery exhausted (PEV) and charge control. As the pack voltage is lower than the PLV, the
SS4003 will enable the battery low control output through the Batt_Low pin for secondary battery pack
protection. Exhausting charge threshold levels are used to determine when the battery has reached a
pre-programmed “empty” state. If a validate discharge period is present, the full charge capacity will
update at this point. Four pre-programmed voltage thresholds, PCV, PBV, PPV and PMV, are used to
determine the charge state. When the pack voltage is lower than the PCV, the charge control is in the
trickle charge mode. In the trickle charge mode, the charge current is controlled at a level below 0.2C.
The charge control will enter the pre-defined constant current charge mode if the pack voltage is higher
than the PCV. The cell balance function activates after the pack voltage reach the PBV and keep in
active state until both cells voltage are over PBV. As the pack voltage goes higher than the PPV, the
charge mode transits from constant current to constant voltage charge mode. Through the whole charge
period, the SS4003 continues monitor the individual cell voltage and keep both cell voltages not larger
than the PMV (predefined cell maximum voltage).
Cell Balancing
The SS4003 also provides the cell balance function. Passive type of cell balance technologies is
implemented in SS4003. The cell balance control output pin controlled the current bypass path during
the charge period. The cell balance function is activate when one of the cell voltage over the pack
balance start voltage (PBV). The cell balance function will turn off when both of the cell voltages are
over the PBV.
Battery Management Data Selections
The SS4003 reserves 4 sets of battery information that can be selected by pin S1 and pin S2. If S1 and
S2 inputs both are grounded, the first set will be used. The set information include: Full-charge capacity
(FCCAP), Voltage at 50% of FCCAP, Pack maximum voltage, End-discharge voltage (3% of FCCAP),
charge taper current, charge current, and trickle- charge current etc. Battery data could be sent to SSC
in advance, and SSC could program the customer specified data sets.

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