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BQ2004E/H Datasheet(PDF) 2 Page - Texas Instruments |
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BQ2004E/H Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 23 page  Pin Descriptions DCMD Discharge-before-charge control input The DCMD input controls the conditions that enable discharge-before-charge. DCMD is pulled up internally. A negative-going pulse on DCMD initiates a discharge to end- of-discharge voltage (EDV) on the BAT pin, followed by a new charge cycle start. Tying DCMD to ground enables automatic discharge-before-charge on every new charge cycle start. DSEL Display select input This three-state input configures the charge status display mode of the LED1 and LED2 out- puts and can be used to disable top-off and pulsed-trickle. See Table 2. VSEL Voltage termination select input This three-state input controls the voltage- termination technique used by the bq2004E/H. When high, PVD is active. When floating, - ∆V is used. When pulled low, both PVD and - ∆V are disabled. TM1– TM2 Timer mode inputs TM1 and TM2 are three-state inputs that configure the fast charge safety timer, voltage termination hold-off time, “top-off ”, and trickle charge control. See Table 1. TCO Temperature cut-off threshold input Input to set maximum allowable battery temperature. If the potential between TS and SNS is less than the voltage at the TCO input, then fast charge or top-off charge is ter- minated. TS Temperature sense input Input, referenced to SNS, for an external thermister monitoring battery temperature. BAT Battery voltage input BAT is the battery voltage sense input, refer- enced to SNS. This is created by a high- impedance resistor-divider network con- nected between the positive and the negative terminals of the battery. SNS Charging current sense input SNS controls the switching of MOD based on an external sense resistor in the current path of the battery. SNS is the reference po- tential for both the TS and BAT pins. If SNS is connected to VSS, then MOD switches high at the beginning of charge and low at the end of charge. LED1– LED2 Charge status outputs Push-pull outputs indicating charging status. See Table 2. Vss Ground VCC VCC supply input 5.0V, ±10% power input. MOD Charge current control output MOD is a push-pull output that is used to control the charging current to the battery. MOD switches high to enable charging cur- rent to flow and low to inhibit charging current flow. DIS Discharge control output Push-pull output used to control an external transistor to discharge the battery before charging. INH Charge inhibit input When low, the bq2004E/H suspends all charge actions, drives all outputs to high im- pedance, and assumes a low-power opera- tional state. When transitioning from low to high, a new charge cycle is started. 2 bq2004E/H |
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