- National Semiconductor Corporation Charge Controller User's Manual

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2.1.2 Li-Ion

Set To: SEL1 SEL2 SEL3

After charging, maintenance charging until battery removal. NA 4.2V/Cell

Hi-Z After charging, maintenance charging until battery removal. If battery

voltage drops below a predefined value, the charger restarts the

charge-process.

Li-Ion NA

GND After charging, no maintenance charging is applied. If battery voltage

drops below a predefined value, the charger restarts the charge-process.

NA 4.1V/Cell

Note: When a three chemistry charger is designed, special considerations must be taken into account regarding configuration pin SEL3. this pin has differnet

meanings when switching between Ni-Cd/Ni-MH and Li-Ion. To ensure correct operation, the SEL3-pin MUST be tied to VCC. If Li-Ion cells of 4.1V/Cells is

used, then minor adjustments have to be done to the voltage measurement resistor divider.

AN101315-9

AN-1164