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BQ2054SNTR Datasheet(PDF) 6 Page - Texas Instruments |
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BQ2054SNTR Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 19 page  Fast charge terminates when the charging current drops below a minimum current threshold programmed by the value of ITERM (see Table 2) and remains below that level for 120 ± 40ms. Figure 3 shows the bq2054 configured for display mode 2 and IMIN =IMAX/10. Voltage and Current Monitoring The bq2054 monitors battery pack voltage at the BAT pin. The user must implement a voltage divider be- tween the positive and negative terminals of the battery pack to present a scaled battery pack voltage to the BAT pin. The bq2054 also uses the voltage across a sense re- sistor (RSNS) between the negative terminal of the bat- tery pack and ground to monitor the current into the pack. See Figure 4 for the configuration of this network. The resistor values are calculated from the following: Equation 1 RB1 RB2 NV V REG =− * . 205 1 where: n N = Number of cells in series n VREG = Desired fast-charging voltage per cell These parameters are typically specified by the battery manufacturer. The total resistance presented across the battery pack by RB1 + RB2 should be between 150k Ω and 1M Ω. The minimum value ensures that the divider network does not drain the battery excessively when the power source is disconnected. Exceeding the maximum value increases the noise susceptibility of the BAT pin. The current sense resistor, RSNS (see Figure 5), deter- mines the fast charge current. The value of RSNS is given by the following: Equation 2 I V R MAX SNS = 0 250 . where: n IMAX = Desired maximum charge current Hold-Off Period Both VHCO and IMIN terminations are ignored during the first 1.33 ± 0.19 seconds of both the Charge Qualifi- cation and Fast Charge phases. This condition prevents premature termination due to voltage spikes that may occur when charge is first applied. 6 bq2054 Table 2. IMIN Termination Thresholds ITERM IMIN 0IMAX/10 1IMAX/20 Float IMAX/30 |
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