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SS4003 Datenblatt(PDF) 5 Page - Silicon Standard Corp.

Teilenummer SS4003
Bauteilbeschribung  Smart Battery Power Management
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Hersteller  SSC [Silicon Standard Corp.]
Direct Link  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

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SS4003
2/01/2005 Rev.1.01
2. Design Capacity (DCAP):
The DCAP is the user-specified battery capacity and is programmed in the ROM.
3. Remaining Capacity (RCAP):
RCAP counts up to the value of FCCAP during charge and counts down during discharge and self-
discharge. RCAP is set to a predefined value if the pack voltage drops down to a predefined level. If
RCAP is equal to the predefined value, RCAP keeps until voltage drops below the predefined level. To
prevent overstatement of charge during periods of overcharge, RCAP stops incrementing when RCAP =
FCCAP.
4. Cumulated Discharge Count (CDC):
The Cumulated Discharge Count is used to record the usage of the battery which response to the life of
battery. The CDC counts up during discharge independent of RCAP and can continue increasing after
RCAP has decremented to 0. The CDC resets to 0 when CDC = FCCAP.
Charge Counting
Charge activity is detected based on a positive voltage on pin I. The voltage input at pin I is measured
and converted into current through the sense resistor. If charge activity is detected, the SS4003
increases the RCAP. Charge actions increment the RCAP according to the cumulated charge counts.
Discharge Counting
Discharge activity is detected based on a negative voltage on pin I. The voltage input at pin I is
measured and converted into current through the sense resistor. If discharge activity is detected, the
SS4003 decreases the RCAP.
Self-Discharge Estimation
Because of the self-discharge, the SS4003 decrements RCAP periodically until the charge full or charge
empty condition is detected. The estimated self-discharge rate is programmed in a ROM.
Charge Control
SS4003 utilizes PWM methodology for charge control. There are three types of charge control, trickle
charge, constant current charge, and constant voltage charge. The SS4003 updates the charging
current based on the battery’s voltage. The SS4003 uses current taper detection for Li-Ion primary
charge termination and over voltage detection to suspend charging. The SS4003 also provides a
number of safety terminations based on battery capacity, voltage, and conditions of individual cell. The
PWM output control range is form 0% to 99%. Two types of control can be applied in typical applications.
Application Circuit 2 shows a PWM to DC voltage conversion circuits that can be used in linear control
applications.


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