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BQ2002TSN Datasheet(PDF) 6 Page - Texas Instruments |
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BQ2002TSN Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 17 page  enforced again on the top-off phase, if selected (bq2002T only). There is no time limit on the trickle-charge phase. Top-off Charge—bq2002T Only An optional top-off charge phase may be selected to follow fast charge termination for 1C and C/4 rates. This phase may be necessary on NiMH or other bat- tery chemistries that have a tendency to terminate charge prior to reaching full capacity. With top-off en- abled, charging continues at a reduced rate after fast-charge termination for a period of time selected by the TM pin. (See Table 1.) During top-off, the CC pin is modulated at a duty cycle of 286 µs active for every 4290 µs inactive. This modulation results in an average rate 1/16th that of the fast charge rate. Maxi- mum voltage, time, and temperature are the only ter- mination methods enabled during top-off. Pulse-Trickle Charge—bq2002T Only Pulse-trickle is used to compensate for self-discharge while the battery is idle in the charger. The battery is pulse-trickle charged by driving the CC pin active for a period of 286 µs for every 72.9ms of inactivity for 1C and 2C selections, and 286 µs for every 17.9ms of inactivity for C/4 selection. This results in a trickle rate of C/256 for the top-off enabled mode and C/128 otherwise. TM Pin The TM pin is a three-level pin used to select the charge timer, top-off, voltage termination mode, trickle rate, and voltage hold-off period options. Table 1 describes the states selected by the TM pin. The mid-level selection input is developed by a resistor divider between VCC and ground that fixes the voltage on TM at VCC/2 ± 0.5V. See Figure 5. Charge Status Indication In the fast charge and charge pending states, and when- ever the inhibit pin is active, the LED pin goes low. The LED pin is driven to the high-Z state for all other condi- tions. Figure 3 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 re- moved. Temperature monitoring is not affected by the INH pin. During charge inhibit, the bq2002D/T contin- ues to pulse-trickle charge the battery per the TM selec- tion. When INH returns low, charge control and the charge timer resume from the point where INH became active. The VTS sample history is cleared by INH. Low-Power Mode The IC enters a low-power state when VBAT is driven above the power-down threshold (VPD) where VPD =VCC - (1V ±0.5V) Both the CC pin and the LED pin are driven to the high-Z state. The operating current is reduced to less than 1 µA in this mode. When VBAT returns to a value below VPD, the IC pulse-trickle charges until the next new charge cycle begins. 6 bq2002D/T |
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