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BQ2058SN-C5TR Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2058SN-C5TR Datasheet(HTML) 4 Page - Texas Instruments |
4 / 14 page Functional Description Figure 1 is a block diagram outlining the major compo- nents of the bq2058. Figure 2 shows a 3- or 4-cell pack supervisor circuit. The following sections detail the vari- ous functional aspects of the bq2058. Thresholds The bq2058 monitors the lithium ion pack for the condi- tions listed below. Shown with these conditions are the respective thresholds used to determine if that condition exists: I Overvoltage (VOV) I Undervoltage (VUV) I Overcurrent (VOCH,VOCL) I Charge Enable (VCE) I Charge Detect (VCD) The bq2058 samples a cell every 40ms (typical). Every sample is a fully differential measurement of each cell. During this sample period, the bq2058 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 bq2058, the bq2058 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 bq2058 circuit to enable the pack. See Low-Power Sleep Mode and Charge Detect sections. 4 bq2058 POS Q1 Si4435DY C6 0.1uF C8 0.1uF Q2 Si4435DY Q4 ZVP3306F R2 6.98K * See note 1. D1 BAT54 * See note 2. Notes: 1. For automatic short circuit recovery. B1P to B1N for 3-cells. 2. Remove R11 for 4-cell. Remove R10 and connect B1P R3 10K C1 0.001uF CSH 10 VCC 11 BAT1P 9 BAT1N 8 BAT2N 7 BAT3N 6 BAT4N 5 VSS 3 CSL 4 OVD 13 OCD 12 UVD 14 DSG 16 CHG 1 CTL 2 NSEL 15 U1 bq2058 R10 0 Ohm 4-Cell C9 0.1uF R11 0 Ohm 3-Cell C7 0.01uF C5 0.1uF C10 0.1uF R6 100K R9 1M Q3 2N7002 TP1 B1N B2N B3N B4N R4 10K R5 10K R7 10K R8 10K C2 0.001uF C3 0.001uF C4 0.001uF R1 2.7K NEG Figure 2. 3- or 4-Cell Li-Ion Battery Pack Supervisor |
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Similar Description - BQ2058SN-C5TR |
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