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BQ2005 Datasheet(PDF) 2 Page - Texas Instruments |
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BQ2005 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 18 page  Pin Descriptions DCMDA Discharge-before-charge control input, battery A DCMDA controls the discharge-before-charge function of the bq2005. A negative-going pulse on DCMDA initiates a discharge to EDV followed by a charge if conditions allow. By tying DCMDA to ground, automatic discharge-before-charge is enabled on every new charge cycle start. DVEN - ∆ Venable input This input enables/disables - ∆ V charge termi- nation. If DVEN is high, the - ∆ V test is en- abled. If DVEN is low, - ∆ V test is disabled. The state of DVEN may be changed at any time. TM1– TM2 Timer mode inputs TM1 and TM2 are three-state inputs that con- figure the fast charge safety timer, - ∆V hold- off time, and that enhance/disable top-off. See Table 2. TCO Temperature cutoff threshold input Input to set maximum allowable battery temperature. If the potential between TSA and SNSA or TSB and SNSB is less than the voltage at the TCO input, then fast charge or top-off charge is terminated for the corre- sponding battery pack. TSA, TSB Temperature sense inputs Input, referenced to SNSA or SNSB, respec- tively, for an external thermistor monitoring battery temperature. BATA, BATB Voltage inputs The battery voltage sense input, referenced to SNSA,B, respectively. This is created by a high-impedance resistor divider network con- nected between the positive and the negative terminals of the battery. SNSA, SNSB Charging current sense inputs, SNSA,B controls the switching of MODA,B based on the voltage across a n external sense resistor in the current path of the bat- tery. SNS is the reference potential for the TS and BAT pins. If SNS is connected to VSS, MOD switches high at the beginning of charge and low at the end of charge. DISA Discharge control output Push-pull output used to control an external transistor to discharge battery A before charging. CHA, CHB Charge status outputs Push-pull outputs indicating charging status for batteries A and B, respectively. See Fig- ure 1 and Table 2. FCCA, FCCB Fast charge complete outputs Open-drain outputs indicating fast charge complete for batteries A and B, respectively. See Figure 1 and Table 2. MODA, MODB Charge current control outputs MODA,B is a push-pull output that is used to control the charging current to the battery. MODA,B switches high to enable charging current to flow and low to inhibit charging current flow t o batteries A and B, respectively. VCC VCC supply input 5.0 V, ±10% power input. Vss Ground 2 bq2005 |
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