rate, and voltage hold-off period options. Table 1 de-

scribes the states selected by the TM pin. The mid-

level selection input is developed by a resistor di-

Charge Status Indication

A fast charge in progress is uniquely indicated when the

LED pin goes low. The LED pin is driven to the high-Z

state for all conditions other than fast charge. Figure 2

outlines the state of the LED pin during charge.

Charge Inhibit

Fast charge and top-off may be inhibited by using the

INH pin. When high, INH suspends all fast charge and

top-off activity and the internal charge timer.

INH

freezes the current state of LED until inhibit is removed.

Temperature monitoring is not affected by the INH pin.

During charge inhibit, the bq2002E/G continues to

pulse-trickle charge the battery per the TM selection.

When INH returns low, charge control and the charge

timer resume from the point where INH became active.

Low-Power Mode

Both the CC pin and the LED pin are driven to the

high-Z state. The operating current is reduced to less

than 1

new charge cycle begins.

6

bq2002E/G