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BQ2004ESNTRG4 Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2004ESNTRG4 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 18 page  The valid temperature range is VHTF <VTEMP <VLTF, where: VLTF = 0.4 ∗ VCC ± 30mV VHTF = [(1/3 ∗ VLTF) + (2/3 ∗ VTCO)] ± 30mV VTCO is the voltage presented at the TCO input pin, and is configured by the user with a resistor divider between VCC and ground. The allowed range is 0.2 to 0.4 ∗ VCC. If the temperature of the battery is out of range, or the voltage is too low, the chip enters the charge pending state and waits for both conditions to fall within their al- lowed limits. During the charge-pending mode, the IC first applies a top-off charge to the battery. The top-off charge, at the rate of 18 of the fast charge, continues until the fast-charge conditions are met or the top-off time-out period is exceeded. The IC then trickle charges until the fast-charge conditions are met. There is no time limit on the charge pending state; the charger remains in this state as long as the voltage or tempera- ture conditons are outside of the allowed limits. If the voltage is too high, the chip goes to the battery absent state and waits until a new charge cycle is started. Fast charge continues until termination by one or more of the six possible termination conditions: n Delta temperature/delta time ( ∆T/∆t) n Peak voltage detection (PVD) n Negative delta voltage (- ∆V) n Maximum voltage n Maximum temperature n Maximum time PVD and - ∆V Termination The bq2004E/H samples the voltage at the BAT pin once every 34s. When - ∆V termination is selected, if VCELL is lower than any previously measured value by 12mV ±4mV (6mV/cell), fast charge is terminated. When PVD termination is selected, if VCELL is lower than any previ- ously measured value by 6mV ±2mV (3mV/cell), fast charge is terminated. The PVD and - ∆V tests are valid in the range 0.4 ∗ VCC <VCELL < 0.8 ∗ VCC. 4 bq2004E/H BD200401.eps Timing Control OSC Display Control Charge Control State Machine Discharge Control MOD Control TCO Check LTF Check A/D EDV Check MCV Check DIS MOD INH VCC VSS BAT SNS TS TCO TM2 TM1 LED1 DCMD DVEN VTS - VSNS VBAT - VSNS LED2 DSEL PWR Control Figure 2. Block Diagram |
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