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BQ2010 Datasheet(PDF) 8 Page - Texas Instruments |
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BQ2010 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 26 page  The compensation factors during discharge are: Temperature compensation during discharge also takes place. At lower temperatures, the compensation factor in- creases by 0.05 for each 10°C temperature step below 10°C. Comp. factor = 1.0 + (0.05 * N) Where N = Number of 10°C steps below 10°C and -150mV < VSR <0. For example: T > 10°C : Nominal compensation, N = 0 0°C<T< 10°C: N = 1 (i.e., 1.0 becomes 1.05) -10°C<T<0°C: N=2 (i.e., 1.0 becomes 1.10) -20°C<T< -10°C: N = 3 (i.e., 1.0 becomes 1.15) -20°C<T< -30°C: N = 4 (i.e., 1.0 becomes 1.20) Self-Discharge Compensation The self-discharge compensation is programmed for a nomi- nal rate of 1 64 * NAC, 1 47 * NAC per day, or disabled. This is the rate for a battery within the 20–30°C temperature range (TMPGG = 6x). This rate varies across 8 ranges from <10°C to >70°C, doubling with each higher temperature step (10°C). See Table 3. Digital Magnitude Filter The bq2010 has a programmable digital filter to elimi- nate charge and discharge counting below a set thresh- old. The default setting is -0.30mV for VSRD and +0.38mV for VSRQ. The proper digital filter setting can be calculated using the following equation. Table 4 shows typical digital filter settings. VSRD (mV) = -45 / DMF VSRQ (mV) = -1.25 * VSRD Error Summary Capacity Inaccurate The LMD is susceptible to error on initialization or if no updates occur. On initialization, the LMD value in- cludes the error between the programmed full capacity and the actual capacity. This error is present until a valid discharge occurs and LMD is updated (see the DCR description on page 7). The other cause of LMD er- ror is battery wear-out. As the battery ages, the meas- ured capacity must be adjusted to account for changes in actual battery capacity. A Capacity Inaccurate counter (CPI) is maintained and incremented each time a valid charge occurs (qualified by NAC; see the CPI register description) and is reset whenever LMD is updated from the DCR. The counter does not wrap around but stops counting at 255. The ca- pacity inaccurate flag (CI) is set if LMD has not been updated following 64 valid charges. Current-Sensing Error Table 5 illustrates the current-sensing error as a func- tion of VSR. A digital filter eliminates charge and dis- charge counts to the NAC register when VSRO (VSR + VOS) is between VSRQ and VSRD. Communicating With the bq2010 The bq2010 includes a simple single-pin (DQ plus re- turn) serial data interface. A host processor uses the in- terface to access various bq2010 registers. Battery char- acteristics may be easily monitored by adding a single contact to the battery pack. The open-drain DQ pin on 8 bq2010 Temperature Range Typical Rate PROG5 = Z PROG5 = L < 10°C NAC 256 NAC 188 10–20°C NAC 128 NAC 94 20–30°C NAC 64 NAC 47 30–40°C NAC 32 NAC 23.5 40–50°C NAC 16 NAC 11.8 50–60°C NAC 8 NAC 5.88 60–70°C NAC 4 NAC 2.94 > 70°C NAC 2 NAC 1.47 Table 3. Self-Discharge Compensation Approximate VSR Threshold Discharge Compensation Factor Efficiency VSR > -150 mV 1.00 100% VSR < -150 mV 1.05 95% DMF DMF Hex. VSRD (mV) VSRQ (mV) 75 4B -0.60 0.75 100 64 -0.45 0.56 150 (default) 96 -0.30 0.38 175 AF -0.26 0.32 200 C8 -0.23 0.28 Table 4. Typical Digital Filter Settings Not Recommended For New Designs |
Similar Part No. - BQ2010_15 |
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Similar Description - BQ2010_15 |
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