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BQ2005 Datasheet(PDF) 6 Page - Texas Instruments |
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BQ2005 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 16 page  battery 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 TM1 and TM2 input pins. (See Table 2.) During top-off, the CC pin is modulated at a duty cycle of 4s active for every 30s inactive. This modulation results in an average rate 1/8th that of the fast charge rate. Maximum voltage, time, and temperature are the only termination methods enabled during top-off. Pulse-Trickle Charge Pulse-trickle charging follows the fast charge and op- tional top-off charge phases to compensate for self- discharge of the battery while it is idle in the charger. The configured pulse-trickle rate is also applied in the charge pending state to raise the voltage of an over- discharged battery up to the minimum required before fast charge can begin. In the pulse-trickle mode, MOD is active for 260 µsofa period specified by the settings of TM1 and TM2. See Ta- ble 1. The resulting trickle-charge rate is C/64 when top-off is enabled and C/32 when top-off is disabled. Both pulse trickle and top-off may be disabled by tying TM1 and TM2 to VSS. Charge Status Indication Charge status is indicated by the CHG output. The state of the CHG output in the various charge cycle phases is shown in Figure 4 and illustrated in Figure 2. Temperature status is indicated by the TEMP output. TEMP is in the high state whenever VTEMP is within the temperature window defined by the VLTF and VHTF tem- perature limits, and is low when the battery tempera- ture is outside these limits. In all cases, if VCELL exceeds the voltage at the MCV pin, both CHG and TEMP outputs are held high regard- less of other conditions. CHG and TEMP may both be used to directly drive an LED. Pack Sequencing If both batteries A and B are present when a new charge cycle is started, the charge cycle starts on battery B and B remains the active channel until fast charge termina- tion. Then battery A will be fast charged, followed by a top-off phase on B (if selected), a top-off phase on A (if selected), and then maintenance charging on both. If only battery A is present, the charge cycle begins on A and continues until fast charge termination even if a battery is inserted in channel B in the meantime. A new battery insertion in channel B while A is in the top-off phase terminates top-off on A and begins a new charge cycle on B. If A is configured for or commanded to discharge-before-charge, the discharge may take place while channel B is the active charging channel. When the discharge is complete, if B is still the active channel battery A enters the Charge Pending state until A becomes the active channel. Charge Current Control The bq2005 controls charge current through the MODA,B out- put pin. The current control circuitry is designed to sup- port implementation of a constant-current switching regu- lator or to gate an externally regulated current source. When used in switch mode configuration, the nominal regulated current is: IREG = 0.225V/RSNS Charge current is monitored at the SNSA,B input by the voltage drop across a sense resistor, RSNS, between the low side of the battery pack and ground. RSNS is sized to provide the desired fast charge current. If the voltage at the SNSA,B pin is less than VSNSLO, the MODA,B output is switched high to pass charge current to the battery. When the SNSA,B voltage is greater than VSNSHI, the MODA,B output is switched low—shutting off charging current to the battery. VSNSLO = 0.04 ∗ VCC ± 25mV VSNSHI = 0.05 ∗ VCC ± 25mV When used to gate an externally regulated current source, the SNSA,B pin is connected to VSS, and no sense resisitor is required. 6 bq2005 |
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