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BQ2060A-E619DBQRG4 Datasheet(PDF) 13 Page - Texas Instruments |
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BQ2060A-E619DBQRG4 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 61 page  640 x 13500 Self-DischargeUpdateTime = seconds 256 x n x (Y% per day) 640 135000 256 n (Y% per day) + 6750 seconds bq2060A www.ti.com SLUS500D – OCTOBER 2001 – REVISED OCTOBER 2011 Self-Discharge The bq2060A estimates the self-discharge of the battery to maintain an accurate measure of the battery capacity during periods of inactivity. The algorithm for self-discharge estimation takes a programmed estimate for the expected self-discharge rate at 25 °C stored in EEPROM and makes a fixed reduction to RM of an amount equal to RemainingCapacity()/256. The bq2060A makes the fixed reduction at a varying time interval that is adjusted to achieve the desired self-discharge rate. This method maintains a constant granularity of 0.39% for each self-discharge adjustment, which may be performed multiple times per day, instead of once per day with a potentially large reduction. The self-discharge estimation rate for 25 °C is doubled for each 10 degrees above 25°C or halved for each 10 degrees below 25 °C. The following table shows the relation of the self-discharge estimation at a given temperature to the rate programmed for 25 °C (Y% per day): TEMPERATURE( C) SELF-DISCHARGE RATE Temp < 10 1/4Y% per day 10 ≤ Temp < 20 ½ Y% per day 20 ≤ Temp < 30 Y% per day 30 ≤ Temp < 40 2Y% per day 40 ≤ Temp < 50 4Y% per day 50 ≤ Temp < 60 8Y% per day 60 ≤ Temp < 70 16Y% per day 70 ≤ Temp 32Y% per day The interval at which RM is reduced is given by the following equation, where n is the appropriate factor of 2 (n = 1/ 4, 1/ 2, 1, 2 . . . ): (2) The timer that keeps track of the self-discharge update time is halted whenever charge activity is detected. The timer is reset to zero if the bq2060A reaches the RemainingCapacity()=FullChargeCapacity() condition while charging. Example: If T = 35 °C (n = 2) and programmed self-discharge rate Y is 2.5 (2.5% per day at 25°C), the bq2060A reduces RM by RM/256 (0.39%) every (3) This means that a 0.39% reduction of RM is made 12.8 times per day to achieve the desired 5% per day reduction at 35 °C. Figure 7 illustrates how the self-discharge estimate algorithm adjusts RemainingCapacity() vs. temperature. Light Discharge or Suspend Current Compensation The bq2060A can be configured in two ways to compensate for small discharge currents that produce a signal below the digital filter. First, the bq2060A can decrement RM and DCR at a rate determined by the value stored in Light Discharge Current EE 0x2b when it detects no discharge activity and the SMBC and SMBD lines are high. Light Discharge Current has a range of 44 µA to 11.2 mA. Alternatively, the bq2060A can be configured to disable the digital filter for discharge when the SMBC and SMBD lines are high. In this way, the digital filter does not mask the leakage current signal. The bq2060A is configured in this mode by setting the NDF bit in Control Mode. Copyright © 2001–2011, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Link(s): bq2060A |
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