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BQ2058T Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2058T Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 18 page  Functional Description Figure 1 is a block diagram outlining the major compo- nents of the bq2058T. Figure 2 shows a low-side control connection diagram. The following sections detail the various functional aspects of the bq2058T. Thresholds The bq2058T monitors the lithium ion pack for the con- ditions listed below. Shown with these conditions are the respective thresholds used to determine if that con- dition exists: s Overvoltage (VOV) s Undervoltage (VUV) s Overcurrent (VOCH,VOCL) s Charge Enable (VCE) s Charge Detect (VCD) The bq2058T samples a cell every 60ms (typical). Every sample is a fully differential measurement of each cell. During this sample period, the bq2058T compares the measurements with these thresholds to determine if any of the these conditions exist: VOV,VUV, and VCE. Overcurrent and charge detect are conditions that are not sampled, but are continuously monitored. Initialization On initial power-up, such as connecting the battery pack for the first time to the bq2058T, the bq2058T enters the low-power sleep mode, disabling the DSG output. It is recommended that a top to bottom cell connection be made at pack assembly for proper initializa- tion. A charging supply must be applied to the bq2058T circuit to enable the pack. See Low-Power Sleep Mode and Charge Detect sections. 4 bq2058T FG2058T1.eps DSG VCC UVD OVD OCD VCC CSH BAT1P CHG CTL VSS CSL BAT2N BAT2N BAT2N BAT1N bq2058T NEG C6 C7 R1 R2 Q1 Q2 C5 C4 C1 C2 C3 POS BAT1 BAT2 Figure 2. 2-Cell Connection Diagram, Low-Side Control July 1997 |
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