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BQ2011 Datasheet(PDF) 8 Page - Texas Instruments |
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BQ2011 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 21 page  Discharge Compensation Corrections for the rate of discharge are made by adjust- ing an internal discharge compensation factor. The dis- charge factor is based on the dynamically measured VSR. The compensation factors during discharge are: Temperature compensation during discharge also takes place. At lower temperatures, the compensation factor increases by 0.05 for each 10°C temperature step below 10°C. Comp. factor = 1.00 + (0.05 * N) Where N = number of 10°C steps below 10°C and VSR < 50mV. For example: T > 10°C: Nominal compensation, N = 0 0°C<T< 10°C: N = 1 (i.e., 1.00 becomes 1.05) -10°C<T< 0°C: N = 2 (i.e., 1.00 becomes 1.10) -20°C<T< -10°C: N = 3 (i.e., 1.00 becomes 1.15) -20°C<T< -30°C: N = 4 (i.e., 1.00 becomes 1.20) Self-Discharge Compensation The self-discharge compensation is programmed for a nominal rate of 1 80 * NAC per day. 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 2 Error Summary Capacity Inaccurate The LMD is susceptible to error on initialization or if no up- dates occur. On initialization, the LMD value includes the error between the programmed full capacity and the actual capacity. This error is present until a valid discharge oc- curs and LMD is updated (see the DCR description on page 7). The other cause of LMD error is battery wear-out. As the battery ages, the measured 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 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 3 illustrates the current-sensing error as a func- tion of VSR. A digital filter eliminates charge and discharge counts to the NAC register when VSRO (VSR + VOS) is between -400 µV and 500µV. 8 bq2011 Temperature Range Self-Discharge Compensation Typical Rate/Day < 10°C NAC 320 10–20°C NAC 160 20–30°C NAC 80 30–40°C NAC 40 40–50°C NAC 20 50–60°C NAC 10 60–70°C NAC 5 > 70°C NAC 25 . Table 2. Self-Discharge Compensation Approximate VSR Threshold Discharge Compensation Factor Efficiency VSR < 50 mV 1.00 100% VSR1 > 50 mV 1.05 95% VSR2 > 100 mV 1.15 85% VSR3 > 150 mV 1.25 75% VSR4 > 253 mV 1.25 75% Symbol Parameter Typical Maximum Units Notes INL Integrated non-linearity error ± 2 ± 4 % Add 0.1% per °C above or below 25°C and 1% per volt above or below 4.25V. INR Integrated non- repeatability error ± 1 ± 2 % Measurement repeatability given similar operating conditions. Table 3. bq2011 Current-Sensing Errors |
Similar Part No. - BQ2011_05 |
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Similar Description - BQ2011_05 |
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